What is the method of using temporary tables in MySQL?

5 months ago

2 minutes

In MySQL, temporary tables are a special type of table that exists only for the current session and is automatically destroyed at the end of the session. Temporary tables are useful for temporarily storing intermediate results or processing large amounts of data.

The syntax for creating temporary etables is as follows:

CREATE TEMPORARY TABLE temp_table_name (
    column1 datatype,
    column2 datatype,
    ...
);

You can also create temporary tables using the TEMPORARY keyword, as shown below:

CREATE TEMPORARY TABLE IF NOT EXISTS temp_table_name (
    column1 datatype,
    column2 datatype,
    ...
);

You can insert data into a temporary table.

INSERT INTO temp_table_name (column1, column2, ...) VALUES (value1, value2, ...);

When using temporary tables, it is important to keep in mind the following points:

When creating a temporary table, it exists only within the current session and cannot be accessed by other sessions.
In the current session, it is possible to create temporary tables with the same name multiple times, and the system will automatically add a unique identifier after the table name to differentiate them.
Temporary tables do not automatically inherit indexes and foreign key relationships from their parent tables, they need to be added manually.
Once the conversation ends, the temporary table will be automatically destroyed and no longer exist in the database.

In general, a temporary table is a method for temporarily storing data that can be operated on within the current session and automatically deleted at the end of the session, making it ideal for storing intermediate results or processing large amounts of data temporarily.