The full Chinese name of sql is Structured Query Language. It is a special-purpose programming language and a database query and programming language. Used to access data and query, update and manage relational database systems.
Structured Query Language is a high-level, non-procedural programming language that allows users to work on high-level data structures. It does not require users to specify the data storage method, nor does it require users to understand the specific data storage method, so different database systems with completely different underlying structures can use the same structured query language as the interface for data input and management.
Structured Query Language statements can be nested, which makes it extremely flexible and powerful.
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