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The ON clause in MySQL is used to connect multiple tables, and the connection columns in the specified tables must match. The ON clause is used to specify connection conditions and supports connection types such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN. The advantages include reducing data redundancy, improving query efficiency, and enhancing data integrity.
The role of ON in MySQL
The ON clause is used to join two or more tables. It specifies the join condition that the join columns or expressions must match.
Usage
Syntax:
<code class="sql">SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;</code>
Where:
table1
and table2
is the table to be connected. column
is the column to be joined in the two tables. Types
MySQL supports the following connection types, each with its own ON clause:
Advantages
The advantages of using the ON clause include:
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