ThearchyHelios
c38177aea6
SQL 差异说明第 3 轮补充:只在一边被去掉、被按内连接比的 LEFT JOIN 不说成「另一边没有」「用 INNER JOIN」
规范化在一边认出了「这次 LEFT JOIN 有没有都一样」(去重之后不怕重复、按主键关联、只取可空一侧跳过空值的聚合),另一边
写法不同没认出来时,两边的规范形式一个有关联、一个没有(或者一个内连接、一个 LEFT JOIN),以前会照规范形式说「A 没有
关联 refunds 表」「A 用 INNER JOIN」,可原文两边都写着 LEFT JOIN。现在去掉的关联记在那一段上(_DROPPED_JOINS)、按内
连接比的记在那张表上(_NULL_BLIND),差异说明碰到就不说;表结构里有唯一键、又没用到的那张表,ON 写得认不出是不是按
唯一键关联(s.id IN (o.store_id))时也不说。补了三种写法在三种方言、给不给表结构下的测试。
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