mysql multi-table query

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MySQL multi-table query refers to the operation of using multiple tables to combine for query in the MySQL database. It allows data to be retrieved and combined from multiple tables to meet more complex query needs, and provides powerful data analysis and correlation capabilities. Using multi-table queries requires using appropriate table connection (JOIN) statements to connect different tables, and using relevant conditions to filter and match data. Commonly used table join types include INNER JOIN, LEFT JOIN, RIGHT JOIN, etc. In short, MySQL multi-table query uses data in multiple tables to perform joint queries.