ThearchyHelios
87f0979a90
SQL 差异说明第 3 轮补充:NOT 按德摩根律往里推;结果看行出来先后的一段不拆 BETWEEN、不去 MIN / MAX 里的 DISTINCT
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- NOT (p AND q) 写成 NOT p OR NOT q、NOT (p OR q) 写成 NOT p AND NOT q(p、q 是条件时,三值逻辑下照样成立),在
外连接改写、唯一键判断之前也做一遍。复验者的「意思一样却说了具体的不同」压测脚本在本轮的按主键去掉 LEFT JOIN
上找到了:ON 写成 NOT (NOT (s.id = o.store_id) OR NOT (s.region = 'east')) 时认不出按主键关联,说成「B 用 LEFT
JOIN 关联 stores 表,A 没有」;往里推之后两边一样。
- 结果看行出来先后的一段不拆 BETWEEN、不去掉 MIN / MAX 里的 DISTINCT、不按德摩根律改写(一个 BETWEEN 和两个比较
估算出的行数可能不同,换一种扫描的先后,GROUP_CONCAT 拼出来的先后就跟着变)。
- 测试:德摩根律的等价改写进 _SAME_R3,NOT (a AND b) 对 NOT a AND NOT b 进 _DIFF_R3;「排除」那条说法跟着往里推
之后的写法改。
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