Question

怎样sql中创建一个自定义函数，实现两个整数相加，并返回其和值

Answer 1

create function Add(@num_a int ,@num_b int) returns bigint
begin
declare @countTotal bigint
set @countTotal = (@num_a + @num_b
return @countTotal
end

Answer 2

create function add1(a int,b int) returns int
return a+b;