Question

SELECT Student_Number,
DATEPART("yyyy", Starting_Date) AS Starting_Year,
DATEPART("yyyy",Ending_Date) AS Ending_Year
FROM   PGME
WHERE  ID = 1

显示如下

Student_Number    Starting_Year Ending_Year
003329497         1994          1999

但我需要的是比较＆＃34; Starting_Year＆＃34;和＆＃34; Ending_Year＆＃34; （他们是随机日期），当＆＃34; Ending_Year＆＃34;大于＆＃34; Starting_Year＆＃34;，它将显示一个新行，直到＆＃34; Starting_Year＆＃34;等于＆＃34; Ending_Year＆＃34;。（我希望得到以下结果）

Student_Number    Starting_Year Ending_Year
003329497         1994          1999
003329497         1995          1999
003329497         1996          1999
003329497         1997          1999
003329497         1998          1999
003329497         1999          1999

Student_Number（1）

Student_Number    Starting_Year Ending_Year
002442895         1993          2000
002442895         1994          2000
002442895         1995          2000
002442895         1996          2000
002442895         1997          2000
002442895         1998          2000
002442895         1999          2000
002442895         2000          2000

Student_Number（2）

有超过100个＆＃34; Student_Number＆＃34;我需要做的。我正在考虑使用＆＃34;如果＆＃34;声明要做到这一点，但无法弄明白。有什么办法吗？

Answer 1

您可以使用笛卡尔（乘法）查询：

SELECT 
    Student_Number,
    Year(Starting_Date) + Ten.N AS Starting_Year,
    Year(Ending_Date) AS Ending_Year
FROM
    PGME,
        (SELECT DISTINCT Abs([id] Mod 10) AS N
        FROM msysobjects) As Ten
WHERE
    PGME.ID = 1
    And
    Ten.N <= Year(Ending_Date) - Year(Starting_Date)

MS Access查询比较数字和显示

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