试图从mysql存储过程中获取Count单值

我试图在mysql存储过程中进行计数，但无法获得正确的语法帮助1

    delimiter//
create procedure get_count_workmen_type(
    IN employee_payroll int,    
    OUT mycount int
)


begin 

SELECT count(*) into mycount from workman
where employee_payroll = employee_payroll

end //
delimiter;

---

您应该在参数名称前加前缀（我个人使用“p”）以区别于列名等。例如

其中employee\u payroll=employee\u payroll

将始终为真，因为它将列与自身进行比较

您还应该在select语句的末尾添加分号

将这两个更改放在一起，可以得到如下结果：

delimiter //

create procedure get_count_workmen_type(
    IN p_employee_payroll int,    
    OUT p_mycount int
)
begin 
  SELECT count(*) 
  into p_mycount 
  from workman
  where employee_payroll = p_employee_payroll;
end //

delimiter ;

---

天才，谢谢！我是mysql新手，所以习惯了sql server