The SQL query uses a subquery that returns multiple rows when it should only return a single row. This can lead to unexpected results or errors, depending on the database system. If the `departments` ...

SQL subquery in WHERE clause returns multiple rows, causing a syntax error or incorrect results. The issue is resolved by using the 'IN' operator to correctly ...

I'm having a bit of a problem with some SQL. I'm trying to do a match from one table to another. It works perfectly except for the last line. As soon as I add it NOTHING gets updated. I'm using ...