MSSQL案例Where子句

我有以下查詢。MSSQL案例Where子句

SELECT DISTINCT datepart(day, eventdetails_datetime) as dates , bu_events.event_daysbeforeType 
FROM "bu_events" 

INNER JOIN "bu_eventdetails" ON "bu_eventdetails"."event_id" = "bu_events"."event_id" 

WHERE "bu_events"."is_active" = 1 
AND "bu_events"."is_deleted" =0 
AND "bu_eventdetails"."is_active" = 1 
AND "bu_eventdetails"."is_deleted" =0 
AND "bu_events"."service_id" = '31' 
AND (DATEDIFF(Minute, BU_EventDetails.eventDetails_datetime, '2017-07-12 10:33:19') <=0 or coalesce(event_always_available,0) = 1) 
AND 

(DATEDIFF(d, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1) 


AND (select max(availabletable_amount) 
    from bu_availabletable 
    inner join bu_eventdetails on bu_eventdetails.eventdetail_id = bu_availabletable.eventdetail_id 
    inner join bu_eventpricegroups on bu_eventpricegroups.event_id = bu_eventdetails.event_id 
    where bu_availabletable.eventdetail_id = bu_eventdetails.eventdetail_id 
    and bu_eventpricegroups.eventpricegroup_always_available = 0) > 0 
    AND datepart(Month,eventdetails_datetime) = 07 
    AND datediff(d,getdate(),eventdetails_datetime)>=0

我想要做的，就是如果bu_events.event_daysbeforeType是1，那麼(DATEDIFF(d, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1)，如果它是2，那麼(DATEDIFF(hour, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1)

所以根據bu_events.event_daysbeforeType我想DATEDIFF與d或一小時。

是我到目前爲止已經試過，但沒有工作是這樣的：

SELECT DISTINCT datepart(day, eventdetails_datetime) as dates , bu_events.event_daysbeforeType 
FROM "bu_events" 

INNER JOIN "bu_eventdetails" ON "bu_eventdetails"."event_id" = "bu_events"."event_id" 

WHERE "bu_events"."is_active" = 1 
AND "bu_events"."is_deleted" =0 
AND "bu_eventdetails"."is_active" = 1 
AND "bu_eventdetails"."is_deleted" =0 
AND "bu_events"."service_id" = '31' 
AND (DATEDIFF(Minute, BU_EventDetails.eventDetails_datetime, '2017-07-12 10:33:19') <=0 or coalesce(event_always_available,0) = 1) 
AND 

CASE 
WHEN bu_events.event_daysbeforeType = 1 THEN 
(DATEDIFF(d, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1) 
ELSE 
(DATEDIFF(hour, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1) 
END 

AND (select max(availabletable_amount) 
    from bu_availabletable 
    inner join bu_eventdetails on bu_eventdetails.eventdetail_id = bu_availabletable.eventdetail_id 
    inner join bu_eventpricegroups on bu_eventpricegroups.event_id = bu_eventdetails.event_id 
    where bu_availabletable.eventdetail_id = bu_eventdetails.eventdetail_id 
    and bu_eventpricegroups.eventpricegroup_always_available = 0) > 0 
    AND datepart(Month,eventdetails_datetime) = 07 
    AND datediff(d,getdate(),eventdetails_datetime)>=0

任何想法我做錯了嗎？

來源

2017-07-12 Simos Fasouliotis

你不能像這樣使用這種情況。 case是一個表達式，並且您嘗試將其用作流控制。
從MSDN：

的情況下表達不能被用來控制Transact-SQL語句，語句塊用戶定義的函數，和存儲過程的執行流程。有關流控制方法的列表，請參閱流控制語言（Transact-SQL）。

代替使用箱子，這樣做：

AND 
(
    (
     bu_events.event_daysbeforeType = 1 
     AND (DATEDIFF(d, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1) 
    ) 
    OR 
    (
     bu_events.event_daysbeforeType <> 1 
     AND (DATEDIFF(hour, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1) 
    ) 

)

來源

2017-07-12 07:49:11

非常感謝您，即使@Serg回答了案例解決方案，爲簡單起見，我認爲使用您的方式是我接受的答案。 –

CASE是計算值，並作爲SQL沒有邏輯（布爾）值不應該用邏輯表達式，但所計算的混淆值是邏輯表達式的有效參數。嘗試

AND (CASE WHEN bu_events.event_daysbeforeType = 1 
     THEN (DATEDIFF(d, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) 
     ELSE DATEDIFF(hour, '2017-07-12 10:33:19',BU_EventDetails.eventDetails_datetime) 
    END >= coalesce(BU_Events.event_daysbefore, 0) or coalesce(event_always_available,0) = 1 
)

來源

2017-07-12 08:02:29 Serg

MSSQL案例Where子句

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