File storage format is as follows:
id ,name,age,phone,job
1,AIEX,22,18318888119,IT
2,Egon,24,12938198199,teacher
3.Ton,20,192873666611,IT
Information file CRUD:
. A query, supports three syntax:
select one column names, column names, column names condition 2 where
Support: less than and greater than or equal fuzzy query
例：select name where age >21
b. Create a new employee content, ID automatically increase
c. Delete the contents of employees, you can directly enter the ID
Syntax: set the column name = "new column name" where conditions