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This article shows you how to randomly select a certain number of records in mysql, the content is concise and easy to understand, it can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

1.order by rand ()

Written as follows:

SELECT idFROM `table`order BY rand ()

The disadvantage of this method is that the rand function is executed many times in order by, which affects the efficiency.

2.max (id) * rand () uses join

Written as follows:

SELECT * FROM `table` AS t1JOIN (SELECT ROUND (RAND () * ((SELECT MAX (id) FROM `table`)-(SELECT MIN (id) FROM `table`) + (SELECT MIN (id) FROM `table`) AS id) AS t2WHERE t1.id > = t2.idORDER BY t1.idLIMIT 1. The above is how to randomly select a certain number of records in mysql. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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