MySql notebook

1. Database (DDL, DML, DQL, DCL)

1. Database query language DQL

1. Data query language DQL basic structure is a SELECT clause, FROM clause, WHERE clause
2. Blocks of clause query:
   SELECT <table name field> from <table or view name> where <query>

2. Database Manipulation Language DML

1. Database Manipulation Language There are three main forms:
   1. Insert INSERT
   2. Update Update
   3. delete delete

3. Data Definition Language DDL

1. DDL data definition language used to create the various objects in the database ---- table, view, index, synonyms, and other such clusters: CREATE TABLE (table) / VIEW (view) / INDEX (index) / SYN (synonyms) / cLUSTER (cluster)

4. Data Control Language DCL

1. Data Control Language DCL used to grant a privilege to access the database or recovery, and to control the time and manipulate a database transaction effects occur, monitor the implementation of the database, such as:

1. GRANT: Authorization
2. ROLLBACK [WORK] TO [SAVEPOINT]: to return at some point
3. Rollback -ROLLBACK
4. COMMIT [WORK]: submitted