MySQL stored procedure function

Field name data type Primary key Foreign keys Non empty only Self increasing

id INT yes no yes yes no

name VARCHAR(50) no no yes no no

glass VARCHAR(50) no no yes no no

sch Table content

id name glass

1 xiaommg glass 1

2 xiaojun glass 2

1、 Create a storage function that can count the number of records in the table , The function is called count_sch()

2、 Create a stored procedure avg_sai, Yes 3 Parameters , Namely deptno,job, Receive average salary , Function query emp surface dept by 30,job For the average salary of salesperson .（ pre-use emp surface ）