dylan666 wrote:
> update Table1
> set Visibility=1
> where ConsumerID in (select * from
> Table1 join Table2
> on Table1.ConsumerID = Table2.id
> where Table1.visibility = 0 and Table2.visibility = 1)
>
> Unfortunately I get this error:
> only a single result allowed for a SELECT that is part of an expression
The subquery returns all columns, but "ConsumerID IN ..." expectes only
one column. (Which one should be compared?)
Change the subquery to return only the column you want to use:
update Table1
set Visibility=1
where ConsumerID in (select Table1.ConsumerID from
Table1 join Table2
on Table1.ConsumerID = Table2.id
where Table1.visibility = 0 and Table2.visibility = 1)
But the IN makes the join superfluous:
UPDATE Table1
SET Visibility = 1
WHERE ConsumerID IN (SELECT ID
FROM Table2
WHERE Visibility = 1)
AND Visibility = 0
Regards,
Clemens
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