Let's understand

Опубликовано: 04 Декабрь 2023
на канале: The SQL Hero

324

The SQL order of execution defines the order in which the clauses of a query are evaluated.

Some of the most common query challenges people run into could be easily avoided with a clearer understanding of the SQL order of execution, sometimes called the SQL order of operations.
Understanding SQL query order can help you diagnose why a query won’t run, and even more frequently will help you optimize your queries to run faster.

SELECT TOP X col1,col2...
FROM table1
JOIN table2
ON join_cond1
.....
WHERE cond1....
GROUP BY col1...
HAVING having_cond1...
ORDER BY col1.... -

1. FROM/JOIN
2. WHERE
3. GROUP BY
4. HAVING
5. SELECT
6. ORDER BY
7. TOP

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