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The core statement of SQL language is SELECT statement, which is used to select data from table. SQL full name Structured Query Language (Structured Query Language), its core is data query, its query language has only one, namely SELECT statement.

SQL language core statement is: data query SELECT statement, used to select data from the table.

The data in the database is often for query, so data query is the core operation of the database. In SQL, there is only one query language, namely SELECT statement.

SELECT statements can be used to query and select data; the results are stored in a result table called a result set. Querying data refers to obtaining different data from the database according to different query methods according to requirements. It is the most frequently used and most important operation.

SQL SELECT syntax

SELECT column_name,column_nameFROM table_name;

with

SELECT * FROM table_name;

Additional information:

Structured Query Language (SQL) is a special purpose programming language, a database query and programming language for accessing data and querying, updating and managing relational database systems.

Functions of SQL Language:

SQL has the functions of data definition, data manipulation and data control.

SQL data definition function: It can define the three-level schema structure of the database, namely, the external schema, the global schema and the internal schema structure. In SQL, the external schema is also called View, the global schema is referred to as Schema, and the internal schema is automatically implemented by the system according to the database schema, generally without user intervention.

SQL data manipulation function: including data insertion, deletion and modification of basic tables and views, especially with strong data query function.

SQL data control function: mainly to control the user's access rights to ensure the security of the system.

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