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The usage of inner join in sql

Inner join is a multi-table join keyword.

Syntax:

SELECT * FROM table1 INNER JOIN table2 ON table1.field1 compopr table2.field2

INNER JOIN operation can be divided into the following parts:

Part

Description

Table1, table2

Record the name of the combined table.

Field1, field2

The name of the joined field. If they are not made up of numbers, these fields must be the same

Data types and contain similar data, but they do not need to have the same name.

Compopr

Any relational comparison operator: "=,", "=," or "."

For example: to look up the fields of Categories.CategoryID = Products.CategoryID in 2 tables

SELECT CategoryName, ProductNameFROM Categories INNER JOIN ProductsON Categories.CategoryID = Products.CategoryID

2 tables are associated with the meaning of querying related data

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