Question

I have this :

   ID      ROW_A    ROW_B

'62919' | '9430' | '40754'

I get it thanks to this query :

SELECT * FROM myTable 
WHERE ROW_A != 0

I would like to update it, to put ROW_A’s value into ROW_B

So, is it possible to make the following treatment with one query ?

Now, I’m using this (but it’s wrong) :

UPDATE myTable SET ROW_B = ROW_A
WHERE ID IN(
SELECT * FROM myTable
WHERE ROW_A != 0)

Answer 1

No need for a subquery I’d think:

UPDATE  myTable 
SET     ROW_B = ROW_A
WHERE   ROW_A != 0