The tricky thing is to add a column on the right site with information which ID is Dual Product and which one is Power Only or Gas Only. Does substituting electrons with muons change the atomic shell configuration? Making statements based on opinion; back them up with references or personal experience. How to make a HUE colour node with cycling colours. How common is it to take off from a taxiway? Is it OK to pray any five decades of the Rosary or do they have to be in the specific set of mysteries? I know that I could change mysql mode as follows: But I would like to keep the current mode but fix the problem. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Use of Stein's maximal principle in Bourgain's paper on Besicovitch sets. Find centralized, trusted content and collaborate around the technologies you use most. As you can see from the output above, JOHN DOE's, MARY SMITH's, RIAN WHITE and JACOB JAMES' records have been repeated. My father is ill and booked a flight to see him - can I travel on my other passport? how can I tell mysql to give me the last matched row. Is it OK to pray any five decades of the Rosary or do they have to be in the specific set of mysteries? I used the SQL tag on the post sorry for not calling it out more specifically Ah. This usually happens after importing data from external sources such as spreadsheet applications that don't have the features of relational databases. The query do NOT use ProductID and do NOT check that it matches CustomerAccount and/or Product. MySQL doesn't know their priority and in order to collapse these multiple values into a single, scalar value, you need to tell it which value from the multiple Column B values you want to select. Enterprise-class stability and performance. Remove duplicate records with special rules - Is it possible with a single query? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. [DBAScanResults]) it gives me 78,871 rows, which I am guessing is my unique count of rows without duplicates. Also, a given duplicate record could occur more than two times. @Lumpy, if it helps to solve the problem then definitely (but to clarify, nothing currently exists that is unique). Learn more about Stack Overflow the company, and our products. Run the INSERT commands one by one to populate the table. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. If a customer name is repeated several times, the MIN() function ensures that only the PRIMARY KEY of the record that appears first for each group is retrieved, as shown below. into one that will delete duplicated records? Asking for help, clarification, or responding to other answers. Not the answer you're looking for? Once you execute the command above, the MySQL server should delete the 4 duplicate records as you can confirm from the output below. Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. Did an AI-enabled drone attack the human operator in a simulation environment? Why is this screw on the wing of DASH-8 Q400 sticking out, is it safe? This will filter rows with duplicate fieldno,fieldserial,id,fielddate,fieldsid fields. Sorted by: 1. What maths knowledge is required for a lab-based (molecular and cell biology) PhD? Please explain how your query solves the author's problem; answers without explanation generally aren't received well. mean? To follow along with this guide, make sure you have the following: A LAMP Stack. Can I trust my bikes frame after I was hit by a car if there's no visible cracking? The best answers are voted up and rise to the top, Not the answer you're looking for? How to make a HUE colour node with cycling colours, Hydrogen Isotopes and Bronsted Lowry Acid. Thanks for contributing an answer to Database Administrators Stack Exchange! End goal: I want the table which just has the unique values - so the table should have 78,871 rows in it. Your counting logic is off, and mine was too, until I came up with a simple example to better understand your question. Your current comparison is somewhat apples to oranges. Connect and share knowledge within a single location that is structured and easy to search. Ensure the customer's details are in place by running the following SELECT statement against the customers table. Why does MySQL flag a duplicate key where none exists? How much of the power drawn by a chip turns into heat? How can an accidental cat scratch break skin but not damage clothes? SELECT Country,ANY_VALUE(ID). Which comes first: CI/CD or microservices? Insufficient travel insurance to cover the massive medical expenses for a visitor to US? What are some good resources for advanced Biblical Hebrew study? Then, use the HAVING clause to check any resulting group having multiple records. How appropriate is it to post a tweet saying that I am looking for postdoc positions? Open a terminal window, and switch to the MySQL shell: mysql -u root -p Note: If you get 'ERROR 1698', try opening MySQL using sudo mysql instead. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In this guide, you'll create a test_db database and a sample customers table. Is Spider-Man the only Marvel character that has been represented as multiple non-human characters? Should I include non-technical degree and non-engineering experience in my software engineer CV? rather than "Gaudeamus igitur, *dum iuvenes* sumus!"? Living room light switches do not work during warm/hot weather. Find centralized, trusted content and collaborate around the technologies you use most. Finding Duplicates: GROUP BY and DISTINCT giving different answers, Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. Why is it "Gaudeamus igitur, *iuvenes dum* sumus!" Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, for remove duplicates you should use distinct and not group by. Next, set up a customers table. Making statements based on opinion; back them up with references or personal experience. I have a table with duplicates and I want to present it to the stakeholders so they can help me determine the source of duplication. After each INSERT command, you should get the following output indicating that the record was inserted successfully. Table generation error: ! Is there a reliable way to check if a trigger being fired was the result of a DML action from another *specific* trigger? Pawel. Accelerate time-to-value for AI investments with Domino + Vultr. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Thanks, I have been also thinking about joining the table. However, using a. How appropriate is it to post a tweet saying that I am looking for postdoc positions? Applications of maximal surfaces in Lorentz spaces. Remove all records with duplicates in db2. Do you want to remove, I want to remove all but 1 of the duplicate values. High speed public and private networking. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. What maths knowledge is required for a lab-based (molecular and cell biology) PhD? Do I have 12745 duplicates, or 47,355 duplicates? How to make a HUE colour node with cycling colours. Does substituting electrons with muons change the atomic shell configuration? SELECT DISTINCT text returns 3 records, for A,B,C. Use the command below to get the PRIMARY KEYs of these rows. Asking for help, clarification, or responding to other answers. You can notice this difference by physically examining the output from the SELECT statement above because you just have a few records in your table. Do we decide the output of a sequental circuit based on its present state or next state? Why is it "Gaudeamus igitur, *iuvenes dum* sumus!" How to group by when querying duplicate records? Why does the bool tool remove entire object? Multiple m:m relationships LEFT JOIN giving duplicate records. This time around, you should get an Empty set since there are no duplicates. Deleting duplicates with group by and count, Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. Does the policy change for AI-generated content affect users who (want to) How to mark duplicate values in another column MySQL, Mysql Query select one row from the same values (select duplicate only), MySQL - GROUP BY and display only duplicated, Fetching unique records from duplicate data without using GROUP BY. Fastest way to delete matching rows in MySQL? 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows, Make Oracle backup files available for duplicate, Delete duplicate with same ID PHP/PDO/MYSQL. What does Bell mean by polarization of spin state? Does the policy change for AI-generated content affect users who (want to) Getting multiple identical rows using group by in SQL Server, group by query in sql server returns duplicates, SQL Server query returns duplicate results because of multiple group by columns, Difference between duplicate check if using Distinct and Group by with aggregate, Issue with getting distinct records (group by), Wrong results with group by for distinct count, Group by Clause causing duplicate records. Having identical copies of the same record may negatively affect your application and business logic. Any help with this would be greatly appreciated. If you want to remove all duplicates in your six-column table, leaving only one distinct record from all columns, then try using a deletable CTE: Thanks for contributing an answer to Stack Overflow! Can't get TagSetDelayed to match LHS when the latter has a Hold attribute set. What is your database? The table does not have any primary keys and contains several million entries. Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Insufficient travel insurance to cover the massive medical expenses for a visitor to US? Deploy and manage any application with Cloud 66 on Vultr. Making statements based on opinion; back them up with references or personal experience. Then, use the COUNT () function in the HAVING clause to check if any group have more than 1 element. rev2023.6.2.43474. Each related primary key is on a different table. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. What happens if you've already found the item an old map leads to? None of these numbers add up at all. Is there a field that is at least unique? You don't mention which database you are using, so I'll assume it's MySQL 8.x. If I do a group by, it gives me 12745 rows, which are my duplicate rows: If I do a distinct ( Select distinct * from [dbo]. Recovery on an ancient version of my TexStudio file. Next, populate the customers table with some records. Aside from humanoid, what other body builds would be viable for an (intelligence wise) human-like sentient species? Finally, SELECT text with HAVING COUNT(*) > 1 returns only two records, for the B and C groups. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How can I define top vertical gap for wrapfigure? Did an AI-enabled drone attack the human operator in a simulation environment? Is it possible for rockets to exist in a world that is only in the early stages of developing jet aircraft? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Finally, you'll use the MySQL GROUP BY and HAVING clauses to find and DROP duplicate rows. Thanks for any guidance. Then, examine the output below. rather than "Gaudeamus igitur, *dum iuvenes* sumus!"? Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. When completed, your SQL syntax should be similar to the following statement. Why doesnt SpaceX sell Raptor engines commercially? Can I also say: 'ich tut mir leid' instead of 'es tut mir leid'? Do we decide the output of a sequental circuit based on its present state or next state? What happens if you've already found the item an old map leads to? Does substituting electrons with muons change the atomic shell configuration? How can I divide the contour in three parts with the same arclength? Should I include non-technical degree and non-engineering experience in my software engineer CV? How to select only one data from duplicate data in mysql? But when I add another MySQL column such as ID: The error appears, as someone suggest before I have to add all select columns to GROUP BY so the query becomes, SELECT Country,ID FROM orders GROUP BY Country, ID. Some Product IDs are duplicated: the same Product ID - one with E and the second one with G makes Dual Product. Thank you in advance! I've got foreign keys on: ScanNumber, DB_ID, PluginID_Version. Did an AI-enabled drone attack the human operator in a simulation environment? Could entrained air be used to increase rocket efficiency, like a bypass fan? When prompted, enter the root password of your MySQL server and press ENTER to continue. Share. Why is Bb8 better than Bc7 in this position? Table generation error: ! 576), AI/ML Tool examples part 3 - Title-Drafting Assistant, We are graduating the updated button styling for vote arrows. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Then, the query gets far easier. 3 Answers Sorted by: 1 If you are running MySQL 8.0, you can do this with window functions only, without joins, subqueries or CTEs. The next step is determining the rows that should remain when the duplicates are deleted. Execute the command above. How does TeX know whether to eat this space if its catcode is about to change? rev2023.6.2.43474. To simplify the reason, you are groupping only by Column A, but you also want to SELECT Column B values. Connect and share knowledge within a single location that is structured and easy to search. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. (So my database is four tables currently). Show top N scores in MySQL 8 without duplicates by category, Query with MySQL incompatible with sql_mode=only_full_group_by. Your solution gave me some duplicates, I think because join is made on CustomerAccount. Asking for help, clarification, or responding to other answers. Thanks for contributing an answer to Stack Overflow! The find duplicate values in on one column of a table, you use follow these steps: First, use the GROUP BY clause to group all rows by the target column, which is the column that you want to check duplicate. This is because MySQL does not (yet) implement FULL OUTER JOINs. Should I use the datetime or timestamp data type in MySQL? Even by physically examining the list below, you can see that the duplicate records have been removed completely. This won't work as MySQL does not allow to use the tables that is being deleted in a sub-select. So where duplicates exist all but 1 of those duplicates get deleted. Living room light switches do not work during warm/hot weather. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Extra alignment tab has been changed to \cr. What does "Welcome to SeaWorld, kid!" Should convert 'k' and 't' sounds to 'g' and 'd' sounds when they follow 's' in a word for pronunciation? You need to modify your SELECT clause so it uses: SELECT Country,ANY_VALUE(ID) A more detailed information on why this happens is present on the MySQL guide.. To simplify the reason, you are groupping only by Column A, but you also want to SELECT Column B values. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. To learn more, see our tips on writing great answers. rev2023.6.2.43474. Is it possible? In July 2022, did China have more nuclear weapons than Domino's Pizza locations? sorry @a_horse_with_no_name - but thanks for the clarification. Also, a given duplicate record could occur more than two times. deleting duplicates and keeping only one copy. See my example data (Example what I have and What I need to achieve on the right): As you can see I have Product ID with suffix E (Power) and G (Gas). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In July 2022, did China have more nuclear weapons than Domino's Pizza locations? These groups are duplicate. before upgrading to MySQL 8.0 I used to use GROUP BY to do not select duplicates but now I'm getting: 1055 - Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'database.orders.ID' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by, Time: 0.028000s. Not the answer you're looking for? Build, deploy, and monitor data science at scale. Once you are satisfied with the contents of the tbl_fields_unique table, do this: If you can add an ID column and fill it with a unique value for each record then you should be able to run a query like, This would remove the duplicates then you could delete the. Find centralized, trusted content and collaborate around the technologies you use most. Why wouldn't a plane start its take-off run from the very beginning of the runway to keep the option to utilize the full runway if necessary? Theoretical Approaches to crack large files encrypted with AES. Your table might contain thousands or millions of records in a production environment, and finding and eliminating duplicates manually may not be a feasible solution. According to your query, you have fieldno,fieldserial,id,fielddate,fieldsid as a rule for uniqueness in the GROUP BY clause. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Please tell us what the logic is for deleting a record from your table. But that doesn't remove the duplicates and it shows all the countries. Imagine a simple table with only one column, text: Running SELECT COUNT(*) just yields 6 records, as expected. The table will then record the first_name, last_name and phone number of the customer. SELECT * FROM foos INNER JOIN ( SELECT name FROM foos GROUP BY name HAVING COUNT (*) > 1 ) AS dup ON foos.name = dup.name ORDER BY name. so in your table of ` text ---- A B B C C C ` I want the end output to be ` text ---- A B C `. Ensure that your customers table doesn't contain any more duplicates by executing the GROUP BY and HAVING statement one more time. So my fully unique, non duplicated table is 78,871 - the rows that. To avoid encountering an error, nest the .SELECT MIN() statement one level deeper as shown below. Making statements based on opinion; back them up with references or personal experience. Is linked content still subject to the CC-BY-SA license? Please tell us the logic which determines whether or not a record gets deleted or retained. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. how to approach user acceptance testing for merged constituent records in a CRM system? It's probably better to separate the ID from the TYPE using a CTE. In MySQL, you can find the duplicate rows by executing a GROUP BY clause against the target column and then using the HAVING clause to check a group having more than 1 record. To overcome this challenge, you must delete the duplicate customers' records from your database. How do I import an SQL file using the command line in MySQL? I have looked through all the questions about group by and distinct and they seem to be different in terms of allowing aggregate functions, but none of them answered my question so here goes.. It only takes a minute to sign up. mean. Should I include non-technical degree and non-engineering experience in my software engineer CV? rev2023.6.2.43474. Finally, SELECT text with HAVING COUNT (*) > 1 returns only two records, for the B and C groups. Please note that it is possible for you to INSERT details of the same customer multiple times in this table. Why is it "Gaudeamus igitur, *iuvenes dum* sumus!" rather than "Gaudeamus igitur, *dum iuvenes* sumus!"? Learn more about Stack Overflow the company, and our products. The best answers are voted up and rise to the top, Not the answer you're looking for? What is the fastest method to convert the following query: SELECT COUNT (*) as c FROM tbl_fields WHERE fieldnotes IS NULL GROUP BY fieldno,fieldserial,id,fielddate,fieldsid HAVING COUNT (*) > 1; . You'll then populate the table with a random list of customers' details containing some duplicates. What happens if you've already found the item an old map leads to? If you are running MySQL 8.0, you can do this with window functions only, without joins, subqueries or CTEs. Once you've determine your clean list of the customer_ids, get rid of the duplicate rows by telling MySQL to delete all records from the customers table(DELETE FROM customers.) EXCEPT those that appear in the allow list. To the top, not the answer you 're looking for postdoc positions sticking out, is it to a! And booked a flight to see him - can I divide the contour in three parts with same! Spreadsheet applications that do n't mention which database you are running MySQL 8.0, you can confirm the. Db_Id, PluginID_Version divide the contour in three parts with the same Product ID - one with and! Should get an Empty set since there are no duplicates to separate ID... Having clause to check any resulting group HAVING multiple records is required for a lab-based ( molecular and cell )! When prompted, enter the root password of your MySQL server should delete the duplicate records have been completely. To SELECT Column B values in MySQL running MySQL 8.0, you are running MySQL 8.0, you see... Not check that it is possible for you to INSERT details of the duplicate records you... Why is it `` Gaudeamus igitur, * dum iuvenes * sumus ''. Insert details of the Rosary or do they have to be in the HAVING clause to check if group. Button styling for vote arrows is because MySQL does not allow to use the MySQL should! The second one with G makes Dual Product spin state some records show top N in... Confirm from the type using a CTE we are graduating the updated button styling for vote.... Learn more, see our tips on writing great answers know whether to eat this space if its is. Are running MySQL 8.0, you can confirm from the output of a sequental circuit based on opinion ; them... Switches do not check that it matches CustomerAccount and/or Product mysql find duplicates without group by software engineer?. A sample customers table fielddate, fieldsid fields to get the following indicating. Of those duplicates get deleted your SQL syntax should be similar to the CC-BY-SA license counting logic is,... Molecular and cell biology ) PhD fieldserial, ID, fielddate, fieldsid fields multiple in. This with window functions only, without JOINs, subqueries or CTEs customers table with one., C my other passport inserted successfully the wing of DASH-8 Q400 sticking out, is it OK pray... Of DASH-8 Q400 sticking out, is it OK to pray any decades... A bypass fan better to separate the ID from the type using a CTE polarization spin... You 've already found the item an old map leads to July 2022, did China have than. Are in place by running the following SELECT statement against the customers table with one... Or next state by one to populate the customers table by a if! With MySQL incompatible with sql_mode=only_full_group_by this position the contour in three parts with same... Colours, Hydrogen Isotopes and Bronsted Lowry Acid think because JOIN is made on.... Id - one with G makes Dual Product nuclear weapons than Domino 's Pizza locations for vote.! Crm system generally are n't received well table will then record the first_name, last_name and phone number of same... To the following: a LAMP Stack no visible cracking ; answers without explanation are! Out, is it possible with a single query our products say: 'ich tut mir leid ' the or! First_Name, last_name and phone mysql find duplicates without group by of the duplicate customers ' details containing some,. Only, without JOINs, subqueries or CTEs values - so the which... A taxiway more, see our tips on writing great answers linked content still subject the... Explanation generally are n't received well site design / logo 2023 Stack Exchange Inc ; user licensed! Human-Like sentient species returns 3 records, for a, B, C assume it 's MySQL.... The wing of DASH-8 Q400 sticking out, is it safe manage any with... Catcode is about to change identical copies of the duplicate customers ' details containing some,. Duplicates get deleted a test_db database and a sample customers table does not allow to use the COUNT ( )! A world that is mysql find duplicates without group by ) does TeX know whether to eat this space if its catcode is about change... Cloud 66 on Vultr maximal principle in Bourgain 's paper on Besicovitch sets DROP rows..., or 47,355 duplicates to post a tweet saying that I am looking for expenses for a visitor to?... To crack large files encrypted with AES of DASH-8 Q400 sticking out, is it Gaudeamus. Match LHS when the latter has a Hold attribute set humanoid, other. 'S problem ; answers without explanation generally are n't received well manage any application with 66! Is Bb8 better than Bc7 in this table are voted up and rise to top! Rows with duplicate fieldno, fieldserial, ID, fielddate, fieldsid fields or CTEs of 'es tut leid... Ensure that your customers table and easy to search, trusted content and collaborate around the technologies you most! Bikes frame after I was hit by a car if there 's no cracking! Set since there are no duplicates parts with the same Product ID - one with E the! For an ( intelligence wise ) human-like sentient species change MySQL mode follows. Substituting electrons with muons change the atomic shell configuration identical copies of the same?! Massive medical expenses for a lab-based ( molecular and cell biology ) PhD developing jet?... @ Lumpy, if it helps to solve the problem then definitely ( but to clarify, nothing currently that! For the clarification Stack Overflow the company, and monitor data science at scale LHS when the duplicates and shows... But that does n't remove the duplicates are deleted they have to be in specific. Records have been removed completely, deploy, and mine was too, until I came up a. 'S details are in place by running the following: a LAMP Stack a CRM?. The INSERT commands one by one to populate the table with a startup career ( Ep it!, use the tables that is only in the specific set of?! Rather than `` Gaudeamus igitur, * iuvenes dum * sumus! is... Or responding to other answers to simplify the reason, you are using, so 'll. Allow to use the MySQL server and press enter to continue million entries: running SELECT (! Details of the power drawn by a car if there 's no visible cracking your MySQL should... Work during warm/hot weather times in this position ) > 1 returns only two records for. Centralized, trusted content and collaborate around the technologies you use most your query the... ] ) it gives me 78,871 rows in it there a field is... Of my TexStudio file to be in the HAVING clause to check if any group have more nuclear than... Can I trust my bikes frame after I was hit by a car if there 's no visible?! Of the same customer multiple times in this table like to keep the current but. Exists that is structured and easy to search got foreign keys on: ScanNumber, DB_ID,.. Other passport the rows that is Bb8 better than Bc7 in this guide, make sure you have following! - is it OK to pray any five decades of the same arclength collaborate around technologies... By Column mysql find duplicates without group by, but you also want to remove all but 1 of the drawn. Database is four tables currently ) it shows all the countries B,.... Make a HUE colour node with cycling colours but not damage clothes also want remove... Also say: 'ich tut mir leid ' instead of 'es tut mir '... Field that is structured and easy to search catcode is about to change accelerate time-to-value for AI investments with +... And mine was too, until I came up with references or personal experience are in place by running following. On: ScanNumber, DB_ID, PluginID_Version goal: I want to Column... The best answers are voted up and rise to the CC-BY-SA license FULL OUTER JOINs step... Which just has the unique values - so the table does n't remove the and! Mysql does not have any primary keys and contains several million entries, Hydrogen and... Cycling colours the customer 's details are in place by running the following SELECT statement the... Follow along with this guide, you should get the following output indicating that record! Do you want to remove, I think because JOIN is made on CustomerAccount populate! But that does n't remove the duplicates and it shows all the countries copy paste! Or timestamp data type in MySQL 8 without duplicates by category, query MySQL. Version of my TexStudio file and the second one with E and the second one with E the..., fieldsid fields records from your database a safer community: Announcing our new Code of Conduct, Balancing PhD! The atomic shell configuration, I want the table should have 78,871 rows in.. Duplicates by executing the group by and HAVING clauses to find and DROP duplicate rows, copy paste!, use the command below to get the primary keys of these rows features of relational databases me duplicates. Against the customers table that do n't mysql find duplicates without group by the features of relational databases duplicates are deleted HAVING multiple records car... A Hold attribute set are n't received well used the SQL tag on the wing of DASH-8 Q400 out... Linked content still subject to the top, not the answer you 're looking for postdoc?. This table also, a given duplicate record could occur more than 1 element MySQL as... Having clauses to find and DROP duplicate rows statements based on opinion back...
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