MySql order by (varchar) date in Mmm-dd-yyyy

问题

So unfortunately I have a VARCHAR column of dates formatted like so: Jun-13-2013

(I understand that this is done incorrectly and should be stored in a DATETIME column in the standard format)

I'm trying to grab all the data in every row and ORDER by that VARCHAR column as a DATETIME, but I'm not finding anything out there to convert my poorly formatted date column for sorting.

here is my query:

$result = mysql_query("SELECT * FROM archive ORDER BY crapdates DESC");

But I'm trying to convert the crapdates column to a datetime... is this even possible?

I'm not finding a mmm-dd-yyyy format conversion anywhere

Thanks for checking it out

回答1:

You want the STR_TO_DATE() function to convert your existing varchar column to a date value.

I'd definitely recommend creating a new column and using STR_TO_DATE() to copy the value from your existing column into the new column, rather than using STR_TO_DATE() directly in the ORDER BY of your SELECT.

UPDATE archive SET newdate = STR_TO_DATE(crapdate,'%b-%e-%Y');

If you can't change the table structure, you can sort on the existing column like this:

SELECT * FROM archive ORDER BY STR_TO_DATE(crapdate,'%b-%e-%Y') DESC;

回答2:

"You can use STR_TO_DATE() to convert your strings to MySQL date values and ORDER BY the result:

ORDER BY STR_TO_DATE(datestring, '%d/%m/%Y')

However, you would be wise to convert the column to the DATE data type instead of using strings."

Answer: https://stackoverflow.com/a/10637668/1146492 by xdazz

来源：https://stackoverflow.com/questions/17093417/mysql-order-by-varchar-date-in-mmm-dd-yyyy

标签

mysql

sql

datetime

sql-order-by