I want to delete unmatching records from two columns of tables?

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I want to delete unmatching records from two columns of tables by comparing them?

if you want compare two tables :

DELETE FROM Table1
WHERE (COLUMN)
NOT IN
(SELECT Table2.COLUMN  FROM Table2,TABLE1 where Table2.COLUMN=TABLE1.COLUMN)

else:

    DELETE FROM Table1 where column1!=column2

[Solved] How to find the unmatched rows from two tables , Hi, i have two tables one for lets take A table it has one column called 'id' and it has row values like 1,2,� I have two tables in MySQL . #messages table : messageid messagetitle . . #usersmessages table usersmessageid messageid userid . . Now if I want to delete from messages table it's ok. But when I delete message by messageid the record still exists on usersmessage and I have to delete from this two tables at once. I used the following query :

You can also use Left Join to delete unmatching records.

DELETE t1 FROM @TABLE1 t1 
LEFT JOIN @TABLE2 t2 on t1.NAME1 = t2.NAME2
WHERE t2.ID IS NULL

DEMO

MySQL Compare Two Tables to Find Unmatched Records, In data migration, we often have to compare two tables to identify a record in to combine rows in both tables; include only the columns that need to compare. And filters them, keeping only the records where the Pupil Name matches the name on the Marks table. The technical name is a Join. This is often referred to as a "Multiplication", because the number of records in the intermediary table (before filtering) is a multiplication of the two tables:

Please try this.

DELETE FROM @tbl WHERE Column1 != Column2

    OR

DELETE A FROM @tbl1 A
LEFT JOIN @tbl2 B
ON A.Id = B.Id 
WHERE B.Id IS NULL

SQL Left Join, SQL LEFT join fetches a complete set of records from table1, with the To get company name and company id columns from company table and are available in foods table, and their manufacturer must have enlisted to supply table and all rows from result table and matched and unmatched rows from� I want a result of one row (for a json string) with the latest record of Humidity and Temperature from each DeviceID which means two records from Temperature and one from Humidity. The three readings are inserted at the same time so finding one MAX(Timestamp) and then look for other records with the same timestamp works.

How to compare two columns and delete matches in Excel?, If you have two columns/lists including some duplicates, now you want to Click Data > Filter again to remove the filter, and then remove the formulas if you do� The following steps compare two tables and identify the unmatched records: First, use the UNION statement to combine rows in both tables; include only the columns that need to compare. The returned result set is used for the comparison.

Compare two columns and remove duplicates in Excel, Now that you have lots of workbooks with a pool of data, or maybe just one huge � //UnMatching Records var Unmatched = from table1 in dt1.AsEnumerable() But, i have two records 2 & 4 from table2. Do you want to show the Country column also

Column Matching, When adding multiple data tables to an analysis, Spotfire will automatically In the Right data table drop-down list, select the 'Sales Previous Year' data table. Perhaps you have two data tables which both contain a string column named If you are going to group a visualization by unmatched columns, it is important to� Compare two columns and delete matches with Kutools for Excel. With above method is somewhat troublesome, and you can use Kutools for Excel’s Compare Ranges function to quickly select the matches in two columns and then delete them.

Comments
  • Welcome to SO, check this link to see how to ask sql questions: meta.stackoverflow.com/a/271056/2348125
  • You can't "delete records" from "a column" - you can set a column's value to null or delete a complete row.
  • Please edit your question (by clicking on the edit link below it) and add some sample data and the expected output based on that data. Formatted text please, no screen shots. (edit your question - do not post code or additional information in comments)
  • Which DBMS product are you using? "SQL" is just a query language, not the name of a specific database product. Please add a tag for the database product you are using postgresql, oracle, sql-server, db2, ...
  • Tip of today: Switch to modern, explicit JOIN syntax! Easier to write (without errors), easier to read and maintain, and easier to convert to outer join if needed.
  • Product specific answer to a question with no dbms specified. At least tell us which dbms this is for.
  • The SQL query will work for any DB. The demo provided is for SQL Server.
  • Product specific answer to a question with no dbms specified. At least tell us which dbms this is for.
  • This is for SQL related dbms.
  • SQL is a language specified by ANSI/ISO. Many products have their own versions/extensions to the steandard. Your DELETE is not ANSI SQL compliant, so it would be nice if you informed OP which dbms it is written for.