Question

mysql存储过程，参数默认值如何写法

Answer 1

以下只是个例子
CREATE procedure test
@n1 char(10),
@n2 char(10),
@n3 char(10),
@n4 char(10),
@n5 char(10),
@n6 char(10),
@n7 char(10),
@n8 datetime,
@n9 datetime,
@n10 int

as
select * --------这部分请将传入的参数带入查询的条件中
from table1 t1,table2 t2,table3 t3
where deldate between @n8 and @n9
and t1.ponum = t2.ponum
and t2.partnum = t3.partnum
and t3.layer =@n1

GO

Answer 2

MySQL教程4 MySQL8运算符、函数、存储过程及新增数据类型 17.之创建带有IN和OUT参数的存储过程 学习猿地