SQL服務器return語句

Question

我有此查詢：

SELECT t.price/100 as P 
FROM mytable.user as t 
WHERE t.price = ?; 

但我要檢查，如果該參數值爲零的SELECT之前，以避免SQL錯誤，所以我已經試過這樣：

IF (CAST(? AS float) = 0) 
BEGIN 
    RETURN 0 
END 
ELSE 
BEGIN 
    SELECT t.price/100 as P 
    FROM mytable.user as t 
    WHERE t.price = ? 
END; 

但我有此錯誤消息（第3行）：

具有返回值A RETURN語句不能在此 上下文中使用。

Answer 1

不要使用return 0而是使用select 0作爲p。以下是樣本。

IF (CAST(? AS float) = 0) 
BEGIN 
    select 0 as P 
END 
ELSE 
BEGIN 
    SELECT t.price/100 as P 
    FROM mytable.user as t 
    WHERE t.price = ? 
END;