Question

我试图查询过去36个月内已经开立的贷款清单。我还试图将过去12个月内已经开立的贷款数量作为一个单独的列进行查询。

查询为两列返回相同的值，如何在不运行单独查询的情况下从36个月和12个月的间隔获取计数？

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

而不是count代替12 months，更改为sum，如下所示

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

试试这个：

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`

我所做的是使用子查询来计算您想要的每个间隔。通过这种方式，他们应该输出名称，36个月计数，12个月计数全部在一行（记录）。

Answer 3

我希望此查询返回两个单独的计数：

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

尝试 SUM ，如：

SUM(IF('2016-12-21' >= NOW() -INTERVAL 12 MONTH, 1, 0)) AS '12 Month Count'

<强>示例

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>

在WHERE子句中选择日期间隔

4 个答案: