Mysql 带有declare语句的事件调度器

是否可以创建包含declare语句的事件计划程序

我一直在尝试运行此查询，但没有成功

create event dele on schedule
every 1 day 
do
begin
declare c int; 
select count(*) into c from purchased;
if(c > 5) 
delete from purchased limit 2
end if;
end

---

这是因为在

IF

之后缺少

然后的
。参见手册

试试这个：

delimiter |

CREATE EVENT dele
    ON SCHEDULE EVERY 1 DAY
    DO
    BEGIN
        DECLARE c INT;

        SELECT COUNT(*) INTO c
        FROM purchased;

        IF(c > 5)
        THEN
            DELETE FROM purchased LIMIT 2;
        END IF;
END |

delimiter ;