Updating table in sql who is nikki sixx dating july 2016

04-Feb-2018 21:28

When the subquery fails to find a matching row in tbl B, the subquery returns NULL.

But since the UPDATE has no WHERE clause, it will update all rows, even those where the subquery returns NULL.

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There are two ways to modify a table using information contained in other tables in the database: using sub-selects, or specifying additional tables in the you should ensure that the join produces at most one output row for each row to be modified.In this example we insert a single row into the esql Sales Person table.