How can I combine an existing query with a temporary table?

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To combine an existing query with a temporary table, you can use the JOIN clause in the SQL statement. Here is an example:

CREATE TEMPORARY TABLE temp_table AS
SELECT * FROM existing_table WHERE id > 100;

SELECT * FROM temp_table
INNER JOIN existing_table ON temp_table.id = existing_table.id;

In this example, we create a temporary table called "temptable" and populate it with data from an existing table called "existingtable". Then we use the JOIN clause to combine the two tables based on their matching ID values. This will return a result set that includes columns from both tables.