使用在WHERE語句爲NULL

Question

[dbo].[StoreProc1] 
(
@Name varchar(10) = NULL, 
@Age int 
) 

SELECT * FROM TABLE WHERE Name = @Name and Age = @Age 

然而，由於@Name = NULL是不正確的，存儲過程並不知道是否爲Name輸入爲空或不是做Name IS NULL或Name = '<value>'

什麼是快速工作 - 在這附近？

我想我可以做這樣的事情，但沒有更簡單的方法嗎？

IF @Name IS NULL 
BEGIN 
    SELECT * FROM TABLE WHERE NAME IS NULL AND AGE=@AGE 
END 
ELSE 
BEGIN 
    SELECT * FROM TABLE WHERE NAME=@NAME AND AGE=@AGE 
END 

Answer 1

[dbo].[StoreProc1] 
(
@Name varchar(10) = NULL, 
@Age int 
) 

SELECT * FROM TABLE WHERE (Name = @Name OR COALESCE(Name, @Name) IS NULL) and Age = @Age 

Answer 2

更改Name = @Name到：

(Name = @Name OR Name IS NULL AND @Name IS NULL) 

Answer 3

SELECT * FROM TABLE WHERE ISNULL(NAME,'')=ISNULL(@NAME,'') AND AGE=@AGE 

Answer 4

假設你想要得到的結果時，名稱= @Name或者當它們都爲null，那麼我會與去以下。

[dbo].[StoreProc1] 
(
@Name varchar(10) = NULL, 
@Age int 
) 

SELECT * 
    FROM TABLE 
    WHERE (Name = @Name 
     OR (Name IS NULL AND @Name IS NULL)) 
    AND Age = @Age 

希望這會有所幫助。