Basic operations of the database

Original link: https://www.cnblogs.com/study-s/p/5287529.html

SQL Classification: Data Query Language DQL Manipulate DML Define DDL Control DCL 

1. DQL 

SELECT <field name table> FROM <table or view name> WHERE <query condition>

2. DML

INSERT UPDATE DELETE

3. DDL

CREATE TABLE/VIEW/INDEX/SYN/CLUSTER

4.DCL

GRANT ROLLBACK COMMIT