2020年5月27日
Subquery using Exists 1 or Exists *
摘要： Subquery using Exists 1 or Exists * 回答1 No, SQL Server is smart and knows it is being used for an EXISTS, and returns NO DATA to the system. Quoth Mic 阅读全文
posted @ 2020-05-27 14:50 ChuckLu 阅读(235) 评论(0) 推荐(0)
NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL: SQL Server
摘要： NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL: SQL Server NOT IN ? 1 2 3 4 5 6 7 SELECT l.id, l.value FROM [20090915_anti].t_left l WHERE l.value NOT 阅读全文
posted @ 2020-05-27 14:35 ChuckLu 阅读(350) 评论(0) 推荐(0)