What should be considered when creating temporary table…

When creating temporary tables in MySQL, the following points should be noted:

1. Temporary tables must be named with a “#” at the beginning, and they only exist within the current session, being automatically deleted once the session ends.
2. The structure of the temporary table must be identical to that of a regular table, including table name, column names, and data types.
3. The definition of a temporary table can be created using the CREATE TABLE statement just like a regular table, or it can be created from another table using the SELECT INTO statement.
4. The data in temporary tables is only valid within the current session and cannot be accessed by other sessions.
5. The indexes and constraints of temporary tables are only valid within the current session.
6. If the SELECT INTO statement is used in the query to create a temporary table, the temporary table will be automatically populated with data.
7. Temporary tables can be used multiple times within the same session and can also be referenced in different queries.
8. The use of temporary tables can improve query performance, especially in complex query operations where intermediate results can be saved in temporary tables for subsequent use in queries.
9. After using a temporary table, you can manually delete it using the DROP TABLE statement or let it be automatically deleted by closing the session.
10. Temporary tables do not automatically save data. If you need to save data for a long term, you should use regular permanent tables.