MySQL select between two dates not working as expected

Question

I'm trying to create a query that will select all dates between two dates
This is my query:

$query = "SELECT DISTINCT * FROM D1,D2
    WHERE D1.DATE_ADDED BETWEEN '$date1' AND '$date2' AND D1.D1_ID = D2.D2_ID";

The trouble is, it is not returning anything, but not producing an error either

So I tried inputting it directly into phpMyAdmin like this

SELECT DISTINCT * FROM D1,D2
    WHERE D1.DATE_ADDED BETWEEN '2011-01-01' AND '2011-12-12'
        AND D1.D1_ID = D2.D2_ID`

then like this

SELECT DISTINCT * FROM D1,D2
    WHERE D1.DATE_ADDED BETWEEN '2011-01-01' AND '2011-12-12'

and like this

SELECT * FROM D1
    WHERE DATE_ADDED BETWEEN '2011-01-01' AND '2011-12-12'

and I just get

MySQL returned an empty result set (ie zero rows). ( Query took 0.0003 sec )

Yes, my tables exist, and so do the columns:)

Answer 1

In the first cases the lack of results could be because of the inner join. For a result to be in the set it would require a record in both tables, ie. a record from d1 would not appear unless d2 also had that id in the d2_id column. To resolve this, if that is correct for your business logic, use left join .

However, the last of your cases (without the join) suggests the reasons is a lack of matching records in the first (left) table d1.

Without the full dataset we can't really comment further, since all the code you are running is perfectly valid.

Answer 2

If you always want to select an entire year it is easer to select it like this:

SELECT * FROM D1 WHERE YEAR(DATE_ADDED) = 2011;

Answer 3

Please implement below code

SELECT DISTINCT * FROM D1,D2
    WHERE D1.DATE_ADDED BETWEEN DATE_FORMAT('2011-01-01','%Y-%m-%d')
        AND DATE_FORMAT('2011-12-12','%Y-%m-%d')
        AND D1.D1_ID = D2.D2_ID`