[MySQL] SQL general syntax, introduction to SQL classification

SQL general syntax

1.SQL statements can be written in a single line or multiple lines and end with a semicolon.

2. The SQL statements of the MySQL database are not case-sensitive. It is recommended to use uppercase letters for keywords.

3. Notes:

Single-line comments: -- or # Multi-line comments: /* */

 

SQL classification

SQL classification is mainly divided into 4 categories: DDL DML DQL DCL