MySql刪除觸發時，值爲空或非空

Question

請我怎麼能觸發這樣的事情，但沒有IF？可能嗎？？

... 
IF NEW.value IS NULL THEN 
     DELETE FROM table WHERE column IS NULL; 
ELSE 
     DELETE FROM table WHERE column=NEW.value; 
END IF; 

練習時是null值那麼刪除行，其中列是空當值被設置成刪除與列行=值 我想這觸發沒有IF

Answer 1

你可以做一個單一的聲明：

... 
DELETE FROM table WHERE column IS NULL OR column=NEW.value; 
... 

編輯：

DELETE FROM table WHERE (NEW.value IS NULL AND column IS NULL) OR (NEW.value IS NOT NULL AND column = NEW.value)

Answer 2

我想的if/else這將是functionnaly相當於你：

DELETE FROM table WHERE (NEW.value IS NULL AND column IS NULL) OR (column=NEW.value)