期廣義更新查詢在SQL的日期列

我有這種結構命名爲Pedidos SQL Server表：期廣義更新查詢在SQL的日期列

每個月（在其最後的日子）我要運行這個查詢：

UPDATE PEDIDOS 
SET PedFchAct = CONVERT(DATETIME, '2017-08-28 00:00:00', 102), 
    PrgFchAct = CONVERT(DATETIME, '2017-08-28 00:00:00', 102) 
WHERE  
    (PedFecCap = CONVERT(DATETIME, '2017-09-01 00:00:00', 102)) 

UPDATE PEDIDOS 
SET PedFchAct = CONVERT(DATETIME, '2017-08-29 00:00:00', 102), 
    PrgFchAct = CONVERT(DATETIME, '2017-08-29 00:00:00', 102) 
WHERE (PedFecCap = CONVERT(DATETIME, '2017-09-02 00:00:00', 102)) 

UPDATE PEDIDOS 
SET PedFchAct = CONVERT(DATETIME, '2017-08-30 00:00:00', 102), 
    PrgFchAct = CONVERT(DATETIME, '2017-08-30 00:00:00', 102) 
WHERE 
    (PedFecCap > CONVERT(DATETIME, '2017-09-02 00:00:00', 102)) 
    AND (PedFecCap <= CONVERT(DATETIME, '2017-09-30 00:00:00', 102))

這個想法是下面的，我必須在三個分區由PedFecCap分割寄存器。

過濾日期爲：

PedFecCap = 1/nextmonth/2017
PedFecCap = 2/nextmonth/2017，和
lastdayOfnextMonth/nextmonth/2017 < = PedFecCap> 2/nextmonth/2017

然後我必須更新PedFchAct和PrgFchAct，併爲每個過濾段設置當前月份的三個不同日期。例如：

爲PedFecCap = 1/nextmonth/2017，PedFchAct和PrgFchAct = 28/currentmonth/2017

爲PedFecCap = 2/nextmonth/2017，PedFchAct和PrgFchAct = 29/currentmonth/2017

對於lastdayOfnextMonth/nextmonth/2017 < = PedFecCap> 2/nextmonth/2017，PedFchAct和PrgFchAct = 30/currentmonth/2017

我需要概括這個查詢和消除固定值，所以每個月我只運行腳本，而不是重寫查詢。

來源

2017-08-31 Yanet Pedraza

你應該能夠用CASE語句來做到這一點：

UPDATE PEDIDOS 
SET 
    PedFchAct = CASE 
        WHEN PedFecCap = '2017-09-01' THEN '2017-08-28' 
        WHEN PedFecCap = '2017-09-02' THEN '2017-08-29' 
        ELSE '2017-08-30' 
       END, 
    PrgFchAct = CASE 
        WHEN PedFecCap = '2017-09-01' THEN '2017-08-28' 
        WHEN PedFecCap = '2017-09-02' THEN '2017-08-29' 
        ELSE '2017-08-30' 
       END 
WHERE 
    PedFecCap BETWEEN '2017-09-01' AND '2017-09-30'

來源

2017-08-31 18:57:52

這是本月的最佳選擇，但下個月它將會改變，而08和09（8月和9月）將分別爲09和10。這就是泛化的意義。 –

的樣本數據

pedfeccap    pedfchaact prgfchact 
2017-07-01 00:00:00.000 NULL  NULL 
2017-07-02 00:00:00.000 NULL  NULL 
2017-07-03 00:00:00.000 NULL  NULL 
2017-07-28 00:00:00.000 NULL  NULL 
2017-07-29 00:00:00.000 NULL  NULL 
2017-07-30 00:00:00.000 NULL  NULL 
2017-07-31 00:00:00.000 NULL  NULL 
2017-08-01 00:00:00.000 NULL  NULL 
2017-08-02 00:00:00.000 NULL  NULL 
2017-08-03 00:00:00.000 NULL  NULL 
2017-08-27 00:00:00.000 NULL  NULL 
2017-08-28 00:00:00.000 NULL  NULL 
2017-08-29 00:00:00.000 NULL  NULL 
2017-08-30 00:00:00.000 NULL  NULL 
2017-08-31 00:00:00.000 NULL  NULL 
2017-09-01 00:00:00.000 NULL  NULL 
2017-09-02 00:00:00.000 NULL  NULL 
2017-09-03 00:00:00.000 NULL  NULL 
2017-09-27 00:00:00.000 NULL  NULL 
2017-09-28 00:00:00.000 NULL  NULL 
2017-09-29 00:00:00.000 NULL  NULL 
2017-09-30 00:00:00.000 NULL  NULL

可以使用的第一天與最後一天計算每個日期

UPDATE pedidos 
    SET pedfchaact = CASE WHEN pedfeccap = DATEADD(MONTH, DATEDIFF(MONTH, 0, pedfeccap), 0) 
         THEN DATEADD(MONTH, DATEDIFF(MONTH, -1, pedfeccap) -2, 0) + 27 
         WHEN pedfeccap = DATEADD(MONTH, DATEDIFF(MONTH, 0, pedfeccap), 0) + 1 
         THEN DATEADD(MONTH, DATEDIFF(MONTH, -1, pedfeccap) -2, 0) + 28 
         ELSE DATEADD(MONTH, DATEDIFF(MONTH, -1, pedfeccap) -2, 0) + 29 
        END, 
     prgfchact = CASE WHEN pedfeccap = DATEADD(MONTH, DATEDIFF(MONTH, 0, pedfeccap), 0) 
         THEN DATEADD(MONTH, DATEDIFF(MONTH, -1, pedfeccap) -2, 0) + 27 
         WHEN pedfeccap = DATEADD(MONTH, DATEDIFF(MONTH, 0, pedfeccap), 0) + 1 
         THEN DATEADD(MONTH, DATEDIFF(MONTH, -1, pedfeccap) -2, 0) + 28 
         ELSE DATEADD(MONTH, DATEDIFF(MONTH, -1, pedfeccap) -2, 0) + 29 
        END;

結果

pedfeccap    pedfchaact    prgfchact 
2017-07-01 00:00:00.000 2017-06-28 00:00:00.000 2017-06-28 00:00:00.000 
2017-07-02 00:00:00.000 2017-06-29 00:00:00.000 2017-06-29 00:00:00.000 
2017-07-03 00:00:00.000 2017-06-30 00:00:00.000 2017-06-30 00:00:00.000 
2017-07-28 00:00:00.000 2017-06-30 00:00:00.000 2017-06-30 00:00:00.000 
2017-07-29 00:00:00.000 2017-06-30 00:00:00.000 2017-06-30 00:00:00.000 
2017-07-30 00:00:00.000 2017-06-30 00:00:00.000 2017-06-30 00:00:00.000 
2017-07-31 00:00:00.000 2017-06-30 00:00:00.000 2017-06-30 00:00:00.000 
2017-08-01 00:00:00.000 2017-07-28 00:00:00.000 2017-07-28 00:00:00.000 
2017-08-02 00:00:00.000 2017-07-29 00:00:00.000 2017-07-29 00:00:00.000 
2017-08-03 00:00:00.000 2017-07-30 00:00:00.000 2017-07-30 00:00:00.000 
2017-08-27 00:00:00.000 2017-07-30 00:00:00.000 2017-07-30 00:00:00.000 
2017-08-28 00:00:00.000 2017-07-30 00:00:00.000 2017-07-30 00:00:00.000 
2017-08-29 00:00:00.000 2017-07-30 00:00:00.000 2017-07-30 00:00:00.000 
2017-08-30 00:00:00.000 2017-07-30 00:00:00.000 2017-07-30 00:00:00.000 
2017-08-31 00:00:00.000 2017-07-30 00:00:00.000 2017-07-30 00:00:00.000 
2017-09-01 00:00:00.000 2017-08-28 00:00:00.000 2017-08-28 00:00:00.000 
2017-09-02 00:00:00.000 2017-08-29 00:00:00.000 2017-08-29 00:00:00.000 
2017-09-03 00:00:00.000 2017-08-30 00:00:00.000 2017-08-30 00:00:00.000 
2017-09-27 00:00:00.000 2017-08-30 00:00:00.000 2017-08-30 00:00:00.000 
2017-09-28 00:00:00.000 2017-08-30 00:00:00.000 2017-08-30 00:00:00.000 
2017-09-29 00:00:00.000 2017-08-30 00:00:00.000 2017-08-30 00:00:00.000 
2017-09-30 00:00:00.000 2017-08-30 00:00:00.000 2017-08-30 00:00:00.000

來源

2017-08-31 21:08:22

請仔細閱讀我的問題。平臺和團隊（三段更新）只在當天有所不同。這個月本月是一樣的。 –

我再讀一遍。我會稍後嘗試編輯查詢。 –

請參閱更新的SQL UPDATE語句和結果 –

期廣義更新查詢在SQL的日期列

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