sql-server-2008 - SQL 案例语句

Question

更新 1：这是我的数据的样子。

EmployeeId    EmployeeName    Active
12312         bob             0
23432         rob             1
32312         dan             0
43432         jan             1
.........................
.........................

更新：

我正在照顾这样的事情。

EmployeeId    EmployeeName    Active
12312         bob             active
23432         rob             pending
.........................
.........................

我正在尝试解决以下 sql 语句，它给我一个错误，并且不确定这是否是正确的做法......

//错误：关键字“SET”附近的语法不正确。

declare @currentStatus nvarchar(50)

Select EmployeeId,EmployeeName,Active,
       set @currentStatus = case when EmployeeId is not null and Active = 0 then "Active"  else "Pending" end as Status
from EmployeeTable

Answer 1

我认为你应该试试这个：

SELECT EmployeeId, EmployeeName, CASE 
       WHEN (EmployeeId IS NOT NULL AND Active = 0) THEN 'Active' ELSE 'Pending' 
       END AS [Status]  
FROM EmployeeTable

Answer 2

Select EmployeeId,EmployeeName,Active,
       case when EmployeeId is not null and Active = 0 then 'Active'  else 'Pending' end as Status
from EmployeeTable

如果您需要设置 @CurrentStatus 变量，那么您需要单独进行：

Set @currentStatus = case when EmployeeId is not null and Active = 0 then 'Active'  else 'Pending' end 
from EmployeeTable

Answer 3

要获得您在更新后的问题中显示的结果，这是您唯一需要的查询。我不知道你为什么认为你需要一个局部变量来保存每一行的 case 表达式的结果。

SELECT 
  EmployeeId,
  EmployeeName,
  Active,
  [Status] = CASE WHEN EmployeeId IS NOT NULL AND Active = 0 
     THEN 'Active' 
     ELSE 'Pending' END
FROM dbo.EmployeeTable;

EDIT更新了有问题的样本数据：

DECLARE @e TABLE(EmployeeID INT, EmployeeName VARCHAR(32), Active BIT);

INSERT @e VALUES
(12312,'bob',0),
(23432,'rob',1),
(32312,'dan',0),
(43432,'jan',1);

SELECT 
  EmployeeId,
  EmployeeName,
  Active,
  [Status] = CASE WHEN EmployeeId IS NOT NULL AND Active = 0 
     THEN 'Active' 
     ELSE 'Pending' END
FROM @e;

结果：

EmployeeId  EmployeeName  Active  Status
12312       bob           0       Active
23432       rob           1       Pending
32312       dan           0       Active
43432       jan           1       Pending