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This article mainly introduces "MySQL sub-query instance analysis". In daily operation, I believe many people have doubts about MySQL sub-query case analysis. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "MySQL sub-query instance analysis"! Next, please follow the editor to study!

A subquery can be understood as a query nested in other statements, so we have different ways to use different query results.

1. If the subquery is a single-valued result, you can use the =, > and other comparison operators on it.

# query the information of the most expensive goods select * from t_product where price = (select max (price) from t_product)

2. If the subquery is a multi-valued result, you can use [not] in (subquery result) or > all (subquery result) for it.

# query the most expensive product information SELECT * FROM t_product WHERE price > = ALL (SELECT price FROM t_product). At this point, the study on "MySQL sub-query instance analysis" is over. I hope you can solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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