SQL SELECT
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Internal
Overview
Upon execution, an SQL query returns a result set.
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.
Querying Multiple Tables
WHERE
Filters, conditions, condition evaluation.
GROUP BY ... HAVING
(make sure I understand thoroughly and link)