mysql触发器删除插入语法错误

Question

我正在尝试编写一个触发器，以便在表达到限制时删除一定数量的行。这就是我目前所拥有的：

IF (SELECT COUNT(rowa) FROM tableA ) > 10

THEN

DELETE FROM table WHERE dateinsert IN (
SELECT * FROM (
    SELECT dateinsert FROM tableA ORDER BY dateinsert ASC limit 1
) AS P
)
end if;

pypmyadmin提示我有语法错误。

Answer 1

您的sql DELETE 语句中存在语法错误。您无法使用关键字表格。 以下是一个例子。

我已在删除声明中将表格更改为 tableA 。

IF (SELECT COUNT(rowa) FROM tableA ) > 10 THEN
  DELETE FROM tableA WHERE dateinsert IN 
   (SELECT dateinsert FROM
    (SELECT dateinsert FROM tableA ORDER BY dateinsert ASC limit 1) AS tmp1);
END IF;