问题
I have a large list of dates of the format dd-mm-yyyy.
So I want to order on: year, then on month and then on day.
Date and month are in the same field and year is an other field.
I have now: ORDER BY table.year ASC, table.date ASC
The result is that the list is order on year and then days.
How to split/strip the dd-mm format and first sort on month before sorting on days?
Same record:
date | year
dd-mm | yyyy
回答1:
based on your example you can sort the record like this,
ORDER BY STR_TO_DATE(CONCAT(year, '-', date), '%Y-%d-%m') ASC
- SQLFiddle Demo
回答2:
As per my knowledge it's better to use single date type field instead of having seperate two fields for date-month and year as you can easily sort your results.
According to your query date-month can be stripped out using RIGHT(date-monthfield, 2) function. This selects month which is on the right side.
The query would be:
select RIGHT(date-monthfield, 2) from table ORDER BY date-monthfield ASC;
Hope it helps.
来源：https://stackoverflow.com/questions/18299109/mysql-sort-on-year-month-day