如何搜索两个日期之间的记录。 但是表格日期格式是varchar

Question

I have a table. In which, a column name is tb_date , which is varchar format. In that column dates are save, But in different-different format (Like: 01/07/201 OR 01-08-2018 or 2017/03/12 etc.). Now I want a search between given date. But it is not working. I tried it-

SELECT * FROM `user_History` WHERE date_format(str_to_date(`tb_date`, '%d/%m/%Y'), '%d/%m/%Y') BETWEEN '01/06/2018' AND '31/06/2018'

But its giving all record. I tried it in my sql.

Whats is the problem?

Answer 1

Problem is in your str_to_date(tb_date, '%d/%m/%Y') , you give a format %d/%m/%Y of importing date, but you have different formats in this field.

I think, you should process all your table by PHP and, for example, convert all your dates to UNIX_TIMESTAMP by function strtotime() .

It will be more easy than try to create a SQL query for it.