How to query fields that are not empty by mysql

This article mainly explains "mysql how to query fields that are not empty". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "mysql how to query fields that are not empty"!

mysql query field is not empty method: 1. Use "select * from table_name where id ";"statement query;2. Use"select * from table_name where id !=" ";" statement query.

Operating environment of this tutorial: Windows 10 system, mysql version 8.0.22, Dell G3 computer.

How do I find non-empty fields?

1. Query is not empty

select * from table where id "";select * from table where id != "";

2. Query is empty

select * from table where id ="";select * from table where isNull(id);

If the field is of type char or varchar, id="" is OK; if the field is of type int, isNull is better.

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