Select date interval inside WHERE clause - mysql

Question

I'm trying to query a list of loans that have been opened within the past 36 months. I'm also trying to query a count of loans that have been opened within the past 12 months as a separate column.
The query is returning the same values for both columns, how can I get get the count from both 36 month and 12 month intervals without running a separate query?
SELECT
`XDL-NAME`,
COUNT(distinct`XLN-LOANDATE`) as '36 Month Count',
COUNT(IF(`XLN-LOANDATE` >= DATE_SUB(NOW(),INTERVAL 12 MONTH), 1 , NULL)) AS '12 Month Count'
from
LOAN
JOIN
DEALER ON `XLN-DLNO` = `XDL-NUM` WHERE `XLN-LOANDATE` >= DATE_SUB(NOW(),INTERVAL 36 MONTH)
GROUP BY `XDL-NAME`

Answer 1

Instead of count for 12 months, change to sum like below
SELECT
`XDL-NAME`,
COUNT(distinct`XLN-LOANDATE`) as '36 Month Count',
SUM(IF(`XLN-LOANDATE` >= DATE_SUB(NOW(),INTERVAL 12 MONTH), 1 , 0)) AS '12 Month Count'
from
LOAN
JOIN
DEALER ON `XLN-DLNO` = `XDL-NUM` WHERE `XLN-LOANDATE` >= DATE_SUB(NOW(),INTERVAL 36 MONTH)
GROUP BY `XDL-NAME`

Answer 2

Try this:
SELECT
`XDL-NAME`,
count((SELECT `XLN-LOANDATE` WHERE `XLN-LOANDATE` >= DATE_SUB(NOW(),INTERVAL 36 MONTH))) AS '36 Month Count',
count((SELECT `XLN-LOANDATE` WHERE `XLN-LOANDATE` >= DATE_SUB(NOW(),INTERVAL 12 MONTH))) AS '12 Month Count',
from
LOAN
JOIN
DEALER ON `XLN-DLNO` = `XDL-NUM`
GROUP BY `XDL-NAME`
What I did was use subqueries to count each interval you wanted. This way they should output with Name, 36 month count, 12 month count all on one line (record).

Answer 3

I would expect this query to return the two separate counts:
SELECT `XDL-NAME`,
COUNT(*) as `36 Month Count`,
SUM(`XLN-LOANDATE` >= DATE_SUB(NOW(), INTERVAL 12 MONTH)) AS `12 Month Count`
FROM loan l join
dealer d
ON `XLN-DLNO` = `XDL-NUM`
WHERE `XLN-LOANDATE` >= DATE_SUB(NOW(), INTERVAL 36 MONTH)
GROUP BY `XDL-NAME`;

Answer 4

Try SUM like:
SUM(IF('2016-12-21' >= NOW() -INTERVAL 12 MONTH, 1, 0)) AS '12 Month Count'
Sample
mysql> SELECT IF('2016-12-21' >= NOW() -INTERVAL 12 MONTH, 1, 0);
+----------------------------------------------------+
| IF('2016-12-21' >= NOW() -INTERVAL 12 MONTH, 1, 0) |
+----------------------------------------------------+
| 1 |
+----------------------------------------------------+
1 row in set (0,00 sec)
mysql> SELECT IF('2015-12-22' >= NOW() -INTERVAL 12 MONTH, 1, 0);
+----------------------------------------------------+
| IF('2015-12-22' >= NOW() -INTERVAL 12 MONTH, 1, 0) |
+----------------------------------------------------+
| 1 |
+----------------------------------------------------+
1 row in set (0,00 sec)
mysql> SELECT IF('2015-12-21' >= NOW() -INTERVAL 12 MONTH, 1, 0);
+----------------------------------------------------+
| IF('2015-12-21' >= NOW() -INTERVAL 12 MONTH, 1, 0) |
+----------------------------------------------------+
| 0 |
+----------------------------------------------------+
1 row in set (0,00 sec)
mysql>