Who can tell me how SQL operation

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Conclusion also said that the conclusion of SQL

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You may need this article at https://docs.microsoft.com/zh-cn/sql/sql-server/? View=SQL server -- ver15

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Structured Query Language (SQL (Structured Query Language) is referred to as SQL, is a kind of special purpose programming Language, is a database Query and program design Language, is used to access data and Query, update, and the relational database management system,
Structured query language (SQL) is a senior non-procedural programming language that allows the user to work on high-level data structures, it does not require the user to specify the data storage method, also do not need to users understand the specific way of data storage, and so has a completely different underlying structure of the database system, can use the same structured query language (SQL) as the data input and management of the interface, the structured query language (SQL) statements can be nested, which makes it have great flexibility and powerful function,