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7.8

update one table from values in another table

Asked by ebi168 in Databases Miscellaneous

Tags: another, update, from, one, values

Hi,

I used this statement to update one column the 1st table from column value in a 2nd table:

update testb1
set col2=(select col2 from testb2 where testb2.col1=testb1.col1)

But this not only update all rows in testb1 where testb2.col1=testb1.col1, but those with testb2.col1!=testb1.col1 also get updated with value null.

If I put a where condition:
update testb1
set col2=(select col2 from testb2 where testb2.col1=testb1.col1)
where col1='test'

It will only accept literal value, I can't put another table's info there.

Can anyone tell me how do I update only a portion of the rows based on another table.

Thanks

View the Solution FREE for 30 Days

20091111-EE-VQP-92

update one table from values in another table

Asked by ebi168 in Databases Miscellaneous

Tags: another, update, from, one, values

About this solution