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Editor to share with you how to use the concat function in the mysql stitching query, I believe most people do not know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's go to know it together.

The usage is as follows:

/ / query the annual year and month of the table managefee_managefee, and spell year-month with the concat function. For example, 2017 and 1 are spelled into 2017-01. .select CONCAT (a. Yearbook copyright if (a.month)

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