SQL練習題--某書第三章聯結

20190422更新要注意6和7題後面舉例說明了內聯結外聯結還有and和where的不同效果    #1. 爲每個僱員行生成5個副本 SELECT E.empid,E.firstname,E.lastname,N.n FROM HR.Employees AS E CROSS JOIN dbo.Nums AS N WHERE N.n <=5 ORDER BY n,empid; #2.

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