Sql server 使用if-else sql语句进行两次选择

目前我有以下SQL查询

DECLARE @UgpEntry VARCHAR(50)

SET @t1.UgpEntry = (SELECT @UgpEntry = t1.UgpEntry from OITM t1)

IF (@UgpEntry = -1)

SELECT
t1.ItemCode as sapitemcode
     , t1.CodeBars as Barcode
     , t1.ItemName as description
     ,LEFT(t1.ItemName,20) as short_description
     , 
           (select max(p.Price)
        from ITM1 p 
        where p.ItemCode = t1.ItemCode 
          and p.PriceList = 1) as [price_1]
     , CASE t1.VatGourpSa when 'V0' THEN 4 when 'V1' THEN 1 WHEN 'V2' THEN 2 WHEN 'V3' THEN 3 END as TaxCode,t1.U_GRUPOA, t1.U_GRUPOB, t1.U_GRUPOC, t1.UgpEntry

FROM OITM t1
WHERE t1.ItemCode='00004' and t1.UgpEntry = -1
 
ELSE

SELECT t1.ItemCode as sapitemcode
     , t1.CodeBars as Barcode
     , t1.ItemName as description
     ,LEFT(t1.ItemName,20) as short_description
     , (select max(p.Price)
        from ITM9 p 
        where p.ItemCode = t1.ItemCode 
          and p.UomEntry = 1) as [price_1],

           (select max(p.Price)
        from ITM1 p 
        where p.ItemCode = t1.ItemCode 
          and p.PriceList = 1) as [preciocaja]
     , CASE t1.VatGourpSa when 'V0' THEN 4 when 'V1' THEN 1 WHEN 'V2' THEN 2 WHEN 'V3' THEN 3 END as TaxCode,t1.U_GRUPOA, t1.U_GRUPOB, t1.U_GRUPOC, t1.UgpEntry

FROM OITM t1
WHERE t1.ItemCode='v6p' and t1.UgpEntry > -1

我想做的是：

如果OITM表中的t1.UgpEntry列（已存在且有数据）等于-1，则 运行第一个查询

否则运行第二个查询

我做错了什么？我需要运行一个或另一个select，具体取决于IF语句

示例：此记录有一个名为UgpEntry=-1的列

此记录具有UgpEntry=5，并具有其他列

---

如果（@UgpEntry=-1），我认为这个变量是错误的，因为它应该是OITM中的列，但不确定如何使用该列作为IF语句，因为IF语句的布局是正确的。只需确保设置@UgpEntry的查询返回单个结果

DECLARE @UgpEntry VARCHAR(50)

SELECT @UgpEntry = UgpEntry FROM OITM WHERE [enter your condition]

IF (@UgpEntry = -1)
    [remaining logic from your original post]

---

您能否打印

@UgpEntry

的值，以验证在达到IF语句时该值是否确实为-1？您可以这样设置

@UgpEntry

：

从表中选择@UgpEntry=UgpEntry

我应该在第一行这样做吗？在UgpEntry声明从您的表中选择@UgpEntry=UgpEntry？我刚刚编辑了我的主要帖子。您的SELECT语句中没有WHERE子句，无法从OITM获取UgpEntry。因此，如果该表中有多行，则没有ide返回的UgpEntry的值。@JMabee So在选择#1和#2时，都添加了t.UgpEntry=etc。post editedperfect，这是我的问题。多谢各位