SQL SELECT
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Internal
Overview
Query execution. SQL optimizer. Subqueries.
SELECT FROM WHERE GROUP BY HAVING ORDER BY
Select all (possibly across multiple tables) then filter and discard with where.
Clauses
=FROM
FROM permanent|derived|temporary|virtual(view)
Table alias.
Multiple Tables
Link here. Joining Tables.
=WHERE
Filters, conditions, condition evaluation.
GROUP BY ... HAVING
(make sure I understand thoroughly and link)