SQL语句AND 和 OR执行的优先级

本文转载自查看原文 2014-03-20 20:34 8246 数据库/ 积累

例句：

SELECT COUNT(1) FROM RT_CUSTALLOCRESULT 
WHERE REGDATE BETWEEN '2014-03-01' AND '2014-03-31' 
OR (DATE(NEXTTRACKDATE) BETWEEN '2014-03-01' AND '2014-03-31') AND SALEID = 2003

SELECT COUNT(1) FROM RT_CUSTALLOCRESULT 
WHERE (REGDATE BETWEEN '2014-03-01' AND '2014-03-31' 
OR (DATE(NEXTTRACKDATE) BETWEEN '2014-03-01' AND '2014-03-31')) AND SALEID = 2003

没带括号前，优先执行

(DATE(NEXTTRACKDATE) BETWEEN '2014-03-01' AND '2014-03-31') AND SALEID = 2003

带了括号后，优先执行

(REGDATE BETWEEN '2014-03-01' AND '2014-03-31' 
OR (DATE(NEXTTRACKDATE) BETWEEN '2014-03-01' AND '2014-03-31'))

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