sql server

Question

我想在存储过程中使用不同别名的查询字段

select COUNT(EmpCode) as  CountEmp+@para

结果应该是

CountEmp1

45

CountEmp2

54

CountEmp1

76

c＃代码中的查询循环：

select COUNT(EmpCode) where something = @something as CountEmp+@para 

Answer 1

请尝试使用以下代码。它与SQL Server 2012一起正常工作。

IF OBJECT_ID ('temp..#Mytable') IS NOT NULL
CREATE TABLE #Mytable (ID INT IDENTITY (1,1),EmpCode  INT)
DECLARE @max int ,@count int 
SET @max =0;
DECLARE @str varchar(10)
INSERT #Mytable
(EmpCode)
VALUES
(10),
(45),
(35),
(63),
(56),
(65)

SET @count = (SELECT COUNT (ID) FROM #Mytable )
WHILE @count > @max
BEGIN 
    SET @max = @max+1
    SET @str = CONVERT(varchar(10),@max)
    EXEC('SELECT EmpCode AS Empcode'+@str+ ' FROM #Mytable WHERE ID = '+@str)
END

Answer 2

没有动态SQL的方法：

--I create temp table for demonstration
DECLARE @some_table TABLE (
    Something int,
    EmpCode INT
)

INSERT INTO @some_table (Something, EmpCode)
VALUES (1, 10),(1, 22),(1, 12),(2, 12),(2, 30),(3, 65),(3, 15),(3, 11),(3, 5)

--Declare parameter we want to search
DECLARE @param int = 1

--Query
--In cte we select what we need based on parameter
;WITH cte AS (
SELECT  'CountEmp'+CAST(@param as nvarchar(10)) as SomeThing,
        CAST(COUNT(EmpCode) as nvarchar(10)) as EmpCodeCount,
        ROW_NUMBER() OVER (ORDER BY SomeThing ) as rn
FROM @some_table
WHERE SomeThing = @param
GROUP BY SomeThing
)
--And here comes UNION
SELECT SomeThing as Result
FROM (
    SELECT SomeThing,rn
    FROM cte
    UNION ALL
    SELECT EmpCodeCount ,rn
    FROM cte
    ) as t
ORDER BY rn, SomeThing DESC

输出：

Result
------------------
CountEmp1
3

(2 row(s) affected)