Select query for two weeks ago

Question

In my database table I have a field for date (varchar field to save date in yy-mm-dd format ), now I want to select records for two weeks ago. How can i do it ?

Answer 1

Implicit date arithmetic is fairly flexible in MySQL. You can compare dates as strings without explicit use of CAST() or DATE(), but you're trusting MySQL to interpret your format correctly. Luckily for you, it will do just fine with yy-mm-dd.

I would recommend using BETWEEN and INTERVAL so that your query is easily readable; for example:

SELECT * FROM Holidays 
WHERE Date BETWEEN (NOW() - INTERVAL 14 DAY) AND NOW();

The only trick with BETWEEN is that you have to put the lower bound first and the upper bound second; for example, if you write BETWEEN 5 AND 2, this always evaluates to FALSE because there is no value that can be greater than or equal to 5 while also being less than or equal to 2.

Here's a demo of the query in action at SQL Fiddle, and a list of the recognized INTERVAL expressions in MySQL.

Note that the parentheses around the expression NOW() - INTERVAL 14 DAY are not required but I would recommend using them here purely for the sake of clarity. It makes the predicate clause just a little bit easier to read in the absence of proper syntax highlighting, at the expense of two characters.

Answer 2

Ideally you should be using date types to store dates, but being that's not the case, you should look into casting to date then comparing.

select * from yourtable where cast (yourdate as Date) BETWEEN Date_Add(CURDATE(), INTERVAL -21 Day) and Date_Add(CURDATE(), INTERVAL -14 Day)

Note, this is untested and may need a little tweaking, but should give you a general idea of what you need to do.

Also, if it's possible, you should really look into converting the varchar field to a date field....they have date types to prevent this sort of thing from happening, although i know changing field types isn't always a possibility.

Answer 3

you can simply do with ADDDATE to get 14 days ago. compare string with date will work.

SELECT *
FROM your_table
WHERE your_date >= ADDDATE(NOW(), -14) AND your_date < NOW()

Answer 4

I use this for select data in past of past

SELECT * FROM Holidays 
WHERE a.dDate >= DATE( NOW( ) ) - INTERVAL 14
DAY AND a.dDate <= DATE( NOW( ) ) - INTERVAL 8