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Sql updating multiple rows based on a select statement dating a letter

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Not using a WHERE clause will result in updating all of the rows table.

The Oracle UPDATE statement processes one or more rows in a table and then sets one or more columns to the values you specify.Consequently, to prevent this, you might do this: One potential issue may arise when the subquery actually finds more than one matching row in tbl B.If this happens, the UPDATE will terminate with an error ("subquery may return only one row"). 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. YOu coud chask on your phpmyadmins ar here explanation and i found some error message as Multipart identifier table1.column1 when i executed sample query using your example.