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Or within MySQL:

SET FOREIGN_KEY_CHECKS = 0;
SOURCE /path/to/backup_users_orders.sql;
SET FOREIGN_KEY_CHECKS = 1;

LOAD DATA INFILE is a fast way to import data from text files, such as CSV, into a MySQL table.

To import data from a CSV file, use the following SQL statement:

An index is a data structure that improves the speed of data retrieval operations in a database. It allows the database to quickly locate the data without scanning the entire table.

Indexes can be created on one or more columns and are used by the database engine to speed up the search process.

Result: John, Mary, Steve

The UNION operator combines results from two or more SELECT statements, removing duplicates. Use UNION ALL to include duplicates.

SELECT a.columns, b.columns
FROM table a, table b
WHERE condition;

Consider a employees table where we want to find employees who work in the same department: