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Recent questions tagged sql查询问题

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919 views

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sql查询问题返回结果集或者参数

问题描述： sql查询，如果结果集不为空则返回结果集。如果结果集为空，则返回查询参数？说明如下： SELECT CASE WHEN a IS NULL THEN '${k}' ELSE a END AS a; (SELECT a FROM A...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.3k views

1 answer

sql查询问题返回结果集或者参数

问题描述： sql查询，如果结果集不为空则返回结果集。如果结果集为空，则返回查询参数？说明如下： SELECT CASE WHEN a IS NULL THEN '${k}' ELSE a END AS a; (SELECT a FROM A...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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