表中数据
MySQL中or和and的用法
SELECT * from student WHERE id = 1 or id = 2 AND age = 20; -- 查询结果是id = 2且age = 20或者id=1
SELECT * from student WHERE (id = 1 or id = 2 ) AND age = 20; -- 查询结果是 id=1或id=2 且age = 20
问题记录：要求查出 INVOICE_TITLE like ‘12%’或者CLIENT_NAME LIKE ‘%12%’的数据，结果前台一直报请求超时，发现数据多了将近20倍，SQL如下：
SELECT
*
FROM
ewin_should_receive sr,
ewin_client_snap cs
WHERE
sr.client_snap_id = cs.id
AND sr.b_enable = ‘1‘
AND cs.INVOICE_TITLE LIKE ‘%12%‘
OR cs.CLIENT_NAME LIKE ‘%12%‘
正确SQL：
SELECT
*
FROM
ewin_should_receive sr,
ewin_client_snap cs
WHERE
sr.client_snap_id = cs.id
AND sr.b_enable = ‘1‘
AND (
cs.INVOICE_TITLE LIKE ‘%12%‘
OR cs.CLIENT_NAME LIKE ‘%12%‘
)
原文：https://www.cnblogs.com/sueyyyy/p/10448836.html