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2025-04-07 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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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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