摘要:
Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, ret 阅读全文
posted @ 2018-02-18 21:10
Jane_X
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摘要:
Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, ret 阅读全文
posted @ 2018-02-18 21:10
Jane_X
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摘要:
题目: 编写一个SQL查询以获得Employee表中第二高的薪水。 例如,给定上面的Employee表,查询应该返回200为第二高薪水。如果没有第二高的薪水,那么查询应该返回null。 难点: IFFULL函数: 答案: 阅读全文
posted @ 2018-02-18 16:43
Jane_X
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