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Visit Stack Exchange 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. Sign up to join this community I have one table A has column (id, field_1,field_2), and another table B has column (id,field_2) Now I want to merge table B to A, that means i want to update field_2 in table A to value of table B. BTW I am using oracle Thanks Now, each time the above is executed, it will do it across all rows in the table.

If this is something you need to do all the time, I would suggest something else, but for a one-off or very small tables it should be sufficient.

We are going to update column DESCRIPTION and PICTURE in table Categories_Test by using data in table Categories, based on data in the common column CATEGORY_ID. Update data in a column in table A based on a common column in table B. Update data in two columns in table A based on a common column in table B. Conditionally update data in table A based on a common column in table B. No portion may be reproduced without my written permission.

The update query below shows that the PICTURE column is updated by looking up the same ID value in CATEGORY_ID column in table Categories_Test and Categories. If you need to update multiple columns simultaneously, use comma to separate each column after the SET keyword. Here we only want to update PICTURE column in Categories_Test table where the data in Category_Name column is Seafood in table Categories. Software and hardware names mentioned on this site are registered trademarks of their respective companies.

DROP TABLE #TMP1 DROP TABLE #TMP2 CREATE TABLE #TMP1(Lead ID Int, Account Number NVarchar(50)) CREATE TABLE #TMP2(Lead ID Int, Account Number NVarchar(50)) INSERT INTO #TMP1 VALUES (147,'5807811235') ,(150,'5807811326') ,(185,'7006100100007267039'); INSERT INTO #TMP2 VALUES (147,'7006100100007266957') ,(150,'7006100100007267039') ,(185,'7006100100007267039'); UPDATE A SET A. Account Number FROM #TMP1 A INNER JOIN #TMP2 B ON A. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

See example below - it will only perform the update on 2 records despite linking on 3. Account Number Thank you for your interest in this question.

Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.UPDATE [Sales_Lead].[dbo].[Sales_Import] SET [Account Number] = (SELECT Retrieve Account Number. As well as being standard SQL and thus more portable it also will raise an error in the event of there being multiple joined rows on the source side (and thus multiple possible different values to use in the update) rather than having the final result be undeterministic. Account Number FROM Retrieve Account Number WHERE [Sales_Lead].[dbo].[Sales_Import]. UPDATE [Sales_Lead].[dbo].[Sales_Import] SET [Account Number] = Retrieve Account Number. No SELECT * FROM @TB1 merge into Sales_Import using Retrieve Account Number on (Sales_Import. Lead Id) when matched then update set Sales_Import. Account Number; UPDATE table1 SET table1.column = 'some_new_val' WHERE table1IN ( SELECT * FROM ( SELECT table1FROM table1 LEFT JOIN table2 ON ( table2.column = table1.column ) WHERE table1.column = 'some_expected_val' AND table12.column IS NULL ) AS Xalias ) UPDATE table1 SET table1.column = 'some_new_val' WHERE table1IN ( SELECT * FROM ( SELECT table1FROM table1 JOIN table2 ON ( table2.column = table1.column ) WHERE table1.column = 'some_expected_val' ) AS Xalias ) UPDATE Table_A SET Table_A. You may wish to update records in one table based on values in another table.Since you can't list more than one table in the Oracle UPDATE statement, you can use the Oracle EXISTS clause.

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