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This article gives you a summary of the 23 basic knowledge points of mysql, which are all necessary knowledge for learning mysql, which friends can refer to.

1. What is a SQL statement

Sql language: a structured query language. (Structured Query Language), which is the standard language of relational database management system.

It is an interpretive language: write and execute one sentence at a time, without the need for overall compilation and execution.

Grammatical features:

1. There is no "", the string uses''to contain

two。 There is no logical equality, assignment and logical equality are both =

3. Types are no longer the strictest. Any data can be included within''.

4. There is no concept of a Bool value, but you can enter true/false in the view

5. It also has a relational operator: >

= 0 and age

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