Question

我正在尝试创建根据几个条件运行的SP：
我有2个表格，我加入它们之间以获取我需要的信息：
（我发送的是@LocaitonID的参数）

表1“设备”

DeviceID
Device Serial
Model
Carrier
LocationID
Active

表2“地点”

PostID
LocationName
LocationID

现在的问题是如果出现以下信息：

LocationID = @ LocationID，主动=真
Active = false
LocationID = 0，主动=假
LocationID = @ LocationID，主动=假

我怎么能用if语句做？返回

CREATE PROCEDURE [dbo].[GetDeviceInfo] @LocationID int = NULL AS BEGIN
SET NOCOUNT ON;
SELECT GAD.DeviceID,
       GAL.PostID,
       GAD.DeviceSerial,
       GAD.Model,
       GAD.Carrier,
       GAD.PhoneNumber,
       GAD.LocalName,
       GAD.Notes,
       GAD.Created
FROM GuardAppDevices AS GAD
JOIN GuardAppLocations AS GAL ON GAD.LocationID=GAL.LocationID
WHERE (@LocationID = GAD.LocationID
       OR @LocationID IS NULL)
  AND GAD.Active=1

Answer 1

我不确定我是否了解整个情况，但这些标准：

LocationID = @ LocationID，主动=真
Active = false
LocationID = 0，主动=假
LocationID = @ LocationID，主动=假

可以写成SQL WHERE子句，如下所示：

.....
WHERE (LocationID = @LocationID AND Active = 1)
       OR (Active = 0)
       OR (LocationID = 0 AND Active = 0)
       OR (LocationID = @LocationID AND Active = 0)

请注意，标准no.1和no.4可以写为单个标准：LocationID=@LocationID，假设Active字段只能包含true或false值。

根据sql中的条件获取信息

1 个答案: