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This article will explain in detail what is the inner link in mysql. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

What is the internal connection?

Internal connection, also known as connection, is the earliest kind of connection. It can also be called a normal join or a natural join, where the inner join deletes all rows that do not match the rows in the other joined tables from the result table, so the inner join may lose information.

The syntax for internal connections is as follows:

Select fieldlist from table1 [inner] join table2 on table1.column=table2.column

Select "=" in the interface of "set relationships between tables", which is the internal connection.

A join in which an item of data in two tables (or joins) is equal is called an inner join. The result of the join is the formation of a new data table.

The status of the tables (or joins) participating in the inner join is equal.

The operation order of the inner connection is:

1. Each column in the participating data table (or join) matches the columns of other data tables (or joins) to form a temporary data table

two。 Select records that satisfy the equality of data items from the temporary data table.

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