在MSSQL中将IF与外部应用一起使用
我想在OUTER APPLY中编写IF条件。我需要返回不止一列，所以我不想写子查询
SELECT name FROM v_users
OUTER APPLY
(
IF CAST(reg_date AS DATE)<CAST('03/25/2017' AS DATE)
SELECT gender,email,age,class FROM tb_register_old WHERE id=v_users.user_id;
ELSE
SELECT gender,email,age,class FROM tb_register_new WHERE id=v_users.user_id;
)s
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也许这个吗？
SELECT name FROM v_users OUTER APPLY ( SELECT gender,email,age,class FROM tb_register_old WHERE id=v_users.user_id and CAST(reg_date AS DATE)<CAST('03/25/2017' AS DATE) UNION ALL SELECT gender,email,age,class FROM tb_register_new WHERE id=v_users.user_id and CAST(reg_date AS DATE) >= CAST('03/25/2017' AS DATE) )s2020-01-04 16:36:51赞同 展开评论
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