Copy table1.column (primary key) data to table2.column with foreign key constraint.

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Hi,

I need to copy a column SHORT_NAME(with primary key constraint) of table1 to a column SHORT_NAME(with foreign key constraint) of table2.

TABLE1.SHORT_NAME (primary key)
TABLE2.Short_NAME (Foreign Key - reference to Table1.SHORT_NAME)

What I have tried:

UPDATE INDICATORS SET SHORT_NAME = (SELECT SHORT_NAME FROM WBCOUNTRIES WHERE INDICATORS.SHORT_NAME=WBCOUNTRIES.SHORT_NAME);

Message

JavaScript

149 rows updated.

But no data is updated.

Posted 17-Nov-16 7:56am

kmax16

Updated 17-Nov-16 23:10pm

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Richard Deeming 17-Nov-16 14:03pm

Because you've told it to set the SHORT_NAME to exactly the same value.

What were you expecting to happen?

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Mohtshm Zubair · Answer 1 · 2016-11-17T23:09:00

Solution 1

your JOIN condition is saying to update only already existing records. You need to change this to fetch those which are not in child table( one with foreign key), for this you need different JOIN condition

Posted 17-Nov-16 23:09pm

Mohtshm Zubair