i want to ask, how to count date row when data is null using aqua data studio.
For example
select
convert(varchar(10),dateclosed,103)
from customer
where dateclosed = (null)
no. dateclosed count(dateclosed)
1 1/1/2001 2
2. 1/1/2001
3. 2/1/2001 1
4. 3/1/2001 1
5. (null) 4
6. (null)
8. (null)
9. (null)
10. 5/1/2001 3
11. 5/1/2001
12. 5/1/2001
13. 6/1/2001 1
总体职能(COUNT(*)除外)忽视了NUL值,因此,你需要:
COUNT(*) (instead of COUNT(expression))将所有民族统一党的价值观转换到某个特定日期:
SELECT ISNULL(dateclosed, 1900-01-01 ), count(ISNULL(dateclosed, 1900-01-01 ))
FROM customer
GROUP BY ISNULL(dateclosed, 1900-01-01 )
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