Updating one table from another sql server
If it is incorrect, then you can get wrong results.The reason I am mentioning this is because I have seen people write wrong where clauses and then wondering what went wrong because they specified the correct condition in the SET clause.The Check Clause is used to specify the Check constraints.The CHECK constraint is used to limit the value range that can be placed on a column.This is not permitted when the subquery follows =,! statement can be accomplished in one of two ways, primarily depending upon which version of SQL Server you are using.
Here's what I'm trying to execute: UPDATE target SET Nationality=(SELECT Nationality FROM SOURCE where TARGET.[ID]=SOURCE.[ID])But I keep getting this error: Server: Msg 512, Level 16, State 1, Line 1Subquery returned more than 1 value. The SOURCE table has less data than the TARGET, and also has some duplicate data within SOURCE dable.
the FROM clause – it does make it simple to understand and is a nice feature.
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.
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