A repository for revising all essential sql operations.
Resources:
https://www.toptal.com/sql/interview-questions#form
https://zhuanlan.zhihu.com/p/103501133
https://sqlzoo.net/wiki/SQL_Tutorial
There are three types of SQL Commands: Data Definition Language (DDL), Data Manipulation Language (DML) and Data Control Language (DCL).
DDL: CREATE, DROP, ALTER
DML: SELECT, INSERT, UPDATE, DELETE
DCL: COMMIT, ROLLBACK, GRANT, REVOKE
In reality, 90% of SQL commands belong to DML, which is the focus of this repository.