簡單的SQL查詢

Question

我在此查詢附近等不同的說法

DECLARE @CNT INT 
SELECT @CNT= DISTINCT ISNULL(Employee.id,0) 
FROM Employee 
WHERE EMPLOYEE.NAME='KIRAN' 

不正確的語法得到一個錯誤，有什麼不對的語法

SELECT DISTINCT ISNULL(Employee.id,0) 
FROM Employee 
WHERE EMPLOYEE.NAME='KIRAN' 

這個語句工作正常

謝謝 王子

Answer 1

像這樣的事情也許..

DECLARE @CNT INT 
SET @CNT = (SELECT DISTINCT ISNULL(Employee.id,0) 
FROM Employee 
WHERE EMPLOYEE.NAME='KIRAN') 

Answer 2

1.使用必須編寫不同@CNT變量
2.select只有第一行之前，因爲@cnt不表變量是變量，其類型是int

DECLARE @CNT INT 
SELECT top 1 @CNT= ISNULL(Employee.id,0) 
FROM Employee 
WHERE EMPLOYEE.NAME='KIRAN' 

你可以測試它只是

declare @CNT INT 

SELECT top 1 @CNT= ISNULL(Employee.id,0) 
FROM Employee 
WHERE EMPLOYEE.NAME='KIRAN' 

select @CNT