[Solved] Where in the MySQL doc could I find an explanation of const

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The SQL standard defines multiple ways of phrasing subqueries. One of them is called “table expression” (aka “inline view”).

The case you are talking about is a simple table expressions in the form:

SELECT * FROM (<subquery>) <alias> WHERE <condition>

In your case const is the alias.

solved Where in the MySQL doc could I find an explanation of const