使用LIKE查询MySQL范围

Question

I have a ref field in my mysql table that holds values that look like '0-0-at-3267-201411041356'. The first part (0-0-at-3267-) varies in length and values and the second part (201411041356) is a date/time that references a creation date/time. Everything that this code is used for is checked to see if it falls within a certain date/time period, such as between 201409010000 and 201508312359.

Normally I can simply explode the data and then measure but for this instance it would make it too clunky. So what I want to do is use the LIKE function in my query like so LIKE '%201411041356' but I want to use it with the > and < symbols, so the full query looking something like SELECT * FROM my_table WHERE ref LIKE > '%201409010000' AND ref LIKE < '%201508312359'

Any ideas would be most welcome! BTW, this has always been the way this data has been stored and there's lots of it so changing it is not an option.

Answer 1

SELECT *
FROM my_table 
WHERE SUBSTRING(ref,-12) BETWEEN '201409010000' AND '201508312359'` 

would work better for substracting last 12 characters.

Answer 2

您可以在子字符串之间使用，例如：

SELECT * FROM my_table WHERE SUBSTRING(ref,-12) BETWEEN '201409010000' AND '201508312359'

Answer 3

Because You wrote that first part may have different lenght so You have strip substring starting from the end.

So Your quwery may looks like:

SELECT * FROM table 
WHERE
SUBSTRING('ref', -12) > $from
AND 
SUBSTRING('ref', -12) < $to

Answer 4

如果您只想按日期进行度量，请使用：

left(right(ref, 12), 8)