为什么查询不返回结果以及如何在销售栏中添加千位分隔符

Question

I am trying to retrieve results from this query, but it is not fetching any record:

SELECT DATE_FORMAT(BILLDATE,'%M-%Y'), SUM(GROSSAMOUNT), SUM(NETAMOUNT)
FROM BILLDETAILS
WHERE DATE_FORMAT(BILLDATE,'%M-%Y') BETWEEN 'May-2011' AND 'Jul-2011'
GROUP BY MONTH(BILLDATE), YEAR(BILLDATE)
ORDER BY YEAR(BILLDATE) DESC, MONTH(BILLDATE);

I also want to display SUM(GrossAmount) and Sum(NetAmount) as, for example, 1,10,20,356

Answer 1

Your query is doing a string comparison, not a date comparison. Try something like this instead:

SELECT DATE_FORMAT(BILLDATE,'%M-%Y'), SUM(GROSSAMOUNT), SUM(NETAMOUNT)
FROM BILLDETAILS
WHERE BILLDATE BETWEEN '2011-05-01' AND '2011-07-01'
GROUP BY MONTH(BILLDATE), YEAR(BILLDATE)
ORDER BY YEAR(BILLDATE) DESC, MONTH(BILLDATE);

There are a variety of ways to specify the dates in the WHERE clause. Have a look at the Date and Time Functions reference for alterntives. Example:

...
WHERE BILLDATE BETWEEN '2011-05-01' AND '2011-05-01' + INTERVAL 2 MONTH
...

You may find the STR_TO_DATE function useful for converting strings to dates:

SELECT STR_TO_DATE('May-2011', '%M-%Y');
+----------------------------------+
| STR_TO_DATE('May-2011', '%M-%Y') |
+----------------------------------+
| 2011-05-00                       |
+----------------------------------+

So your WHERE clause could be:

WHERE BILLDATE BETWEEN STR_TO_DATE('May-2011', '%M-%Y')
                   AND STR_TO_DATE('Jul-2011', '%M-%Y')

To format the value, use the FORMAT() function:

SELECT FORMAT('11020356', 0);
+-----------------------+
| FORMAT('11020356', 0) |
+-----------------------+
| 11,020,356            |
+-----------------------+

...although formatting is usually best left to the application. If you format it in MySQL, processing it in the application might become a bit tricky.

Answer 2

SELECT DATE_FORMAT(BILLDATE,'%M-%Y'), SUM(GROSSAMOUNT), SUM(NETAMOUNT)
FROM BILLDETAILS
where billdate between '2011-05-01' and '2011-07-31'
GROUP BY MONTH(BILLDATE);

if you're looking for records within 3 months in the same year you don't need year() function.

You can also take a look at format() function

Answer 3

Your problem is that you compare dates as strings in WHERE . If you can't use dates there (why?) you have to format the dates at least the way which works, ie in yyyymm format:

WHERE DATE_FORMAT(BILLDATE,'%Y%m') BETWEEN '201105' AND '201107'