SQL查询不返回所需值

Question

I am executing the following query

SELECT * FROM `temp` WHERE date_of_approval > "16-12-2015"

I want to get all record where the date is greater than "16-12-2015" but it displays all rows which are greater that "16" and not greater than "16-12-2015"

Answer 1

In your table you store the date in the dd-mm-yyyy format so it is compulsory to convert into standard date format first then its compare with dates.

SELECT * FROM `temp` 
WHERE STR_TO_DATE(date_of_approval,'%d-%m-%Y') > STR_TO_DATE('16-12-2015','%d-%m-%Y');

OR

SELECT * FROM `temp`
WHERE STR_TO_DATE(date_of_approval,'%d-%m-%Y') > '2015-12-16';

Answer 2

My recommendation. Always use ISO standard date formats. These are accepted by most databaes:

SELECT t.*
FROM `temp` t
WHERE date_of_approval > '2015-02-16'

Also, use single quotes for string and date constants in SQL statements. This is the standard delimiter for strings.