--320, SQL SERVER 日報--查詢2009-01-01當天客戶A1,A2,A3的訂單數量SELECT Cust_Name   , CONVERT(CHAR(10), Order_Date, 120) Order_Date   , SUM(Qty) QtyFROM Orders_BigWHERE 1=1   AND Cust_Name IN ('A1', 'A2', 'A3')   AND Order_Date >= '2009-01-01'   AND Order_Date<'2009-01-02'   /*AND Order_Date -- BETWEEN...AND相當于>=和<=      BETWEEN '2009-01-01'         AND '2009-01-02'*/GROUP BY Cust_Name   , CONVERT(CHAR(10), Order_Date, 120)ORDER BY 2, 1--321. ORACLE 日報--查詢2009-01-01當天客戶A1,A2,A3的訂單數量SELECT Cust_Name , TO_CHAR(Order_Date, 'YYYY-MM-DD') Order_Date --方法一:轉換成字符串類型 --, TRUNC(Order_Date) Order_Date --方法二:將時分秒信息截斷 , SUM(Qty) QtyFROM Orders_BigWHERE 1=1   AND Cust_Name IN ('A1', 'A2', 'A3')   AND Order_Date >= DATE'2009-01-01'   AND Order_Date<DATE'2009-01-02'GROUP BY Cust_Name    , TO_CHAR(Order_Date, 'YYYY-MM-DD')--方法一    --, TRUNC(Order_Date)--方法二ORDER BY 2, 1------------------------------10.2--------------------------------------326,SQL SERVER 月報SELECT Cust_Name   , CONVERT(CHAR(7), Order_Date, 120) Order_YrMs   , CAST(CONVERT(CHAR(7), Order_Date, 120) + '-01' AS DATETIME) Order_Date   , SUM(Qty) QtyFROM Orders_BigWHERE 1=1  AND Cust_Name IN ('A1', 'A2', 'A3')  AND Order_Date >= '2009-01-01'  AND Order_Date<'2009-02-01'GROUP BY Cust_Name    , CONVERT(CHAR(7), Order_Date, 120)ORDER BY 2, 1--326, ORACLESELECT Cust_Name  , TO_CHAR(Order_Date, 'YYYY-MM') Order_YrMs --方法1  --, TRUNC(Order_Date, 'MM') Order_Date--方法2  , SUM(Qty) QtyFROM Orders_BigWHERE 1=1  AND Cust_Name IN ('A1', 'A2', 'A3')  AND Order_Date >= DATE'2009-01-01'  AND Order_Date<DATE'2009-02-01'GROUP BY Cust_Name  , TO_CHAR(Order_Date, 'YYYY-MM')--方法1  --, TRUNC(Order_Date, 'MM')--方法2ORDER BY 2, 1