GNU Info

(mysql.info)DO

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Enter node , (file) or (file)node

`DO' Syntax
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     DO expression, [expression, ...]

Execute the expression but don't return any results.  This is a
shorthand of `SELECT expression, expression', but has the advantage
that it's slightly faster when you don't care about the result.

This is mainly useful with functions that has side effects, like
`RELEASE_LOCK'.