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What are the functions of sql

2025-01-16 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >

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This article is to share with you about the functions of sql. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

What are four parts of the function of sql?

SQL language functions are mainly divided into four parts:

(1) data definition. (DDL) is used to define the creation and undo operations of SQL schemas, basic tables, views, and indexes.

(2) data manipulation. (DML) data manipulation is divided into two categories: data query and data update. Data update is divided into three operations: insert, delete, and modify.

(3) data control. It includes authorization of basic tables and views, description of integrity rules, transaction control, and so on.

(4) the rules for the use of embedded SQL. Involves rules that SQL statements are embedded in the host language program.

Expansion materials:

DDL is one of the four functions of SQL language. It is used to define the three-level structure of the database, including external schema, conceptual schema, internal schema and their images among them. DDL does not need commit to define data integrity, security control and other constraints.

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