Updating table with values from another table

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updating table with values from another table-76

DATE I can do a select and retrieve the information from TABLE2, but I can't figure out how to update in a SQL statement. ************************************************************************** Notice of Confidentiality: This e-mail communication and the attachments hereto, if any, are intended solely for the information and use of the addressee(s) identified above and may contain information which is legally privileged and/or otherwise confidential.

I have 2 tables and I'm wanting to update the values in the first with the corresponding values in the second, e.g.

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Gerald just make sure you test the update before you run it on live data.

Considering what you're updating, you may want to enforce a "where rownum Ah yes good tip about the "exists" clause.

(Bug #11758262, Bug #50439) See Section 16.2.1.3, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.

If you access a column from the table to be updated in an expression, assignments are generally evaluated from left to right.

Results after the update: a b c d ———————————— 1 x y z 2 a1 b1 c1 3 t x z DB2 LUW: –Same as Oracle– UPDATE TABLEA SET (b, c, d) = (SELECT b1, c1, d1 from TABLEB WHERE TABLEB.a1 = TABLEA.a and TABLEB.e1 40); Results after the update: a b c d ———————————— 1 x y z 2 a1 b1 c1 3 t x z NOTE: It is very important to make sure that your where clause for the update statement is correct since that is what identifies the records that the update statement is going to qualify and do the update upon.

If it is incorrect, then you can get wrong results.

For multiple-table updates, there is no guarantee that assignments are carried out in any particular order. COLUMN2 IS NULLAn outerjoin is performed based on the equijoin condition.

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