本文详细介绍了SQL查询语句的处理顺序，包括FROM、ON、JOIN等子句的执行流程，帮助读者理解如何优化查询语句。
The following steps show the processing order for a SELECT statement.
FROM
ON
JOIN
WHERE
GROUP BY
WITH CUBE or WITH ROLLUP
HAVING
SELECT
DISTINCT
ORDER BY
TOP
FROM
ON
JOIN
WHERE
GROUP BY
WITH CUBE or WITH ROLLUP
HAVING
SELECT
DISTINCT
ORDER BY
TOP
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