FIRST analytical functions returns the null line
The following query returns a null line when there is no such thing as a line for the predicate. Is it a bug or expected behaviour. If so what is the meaning of the null row, is it not logical?SELECT NVL (max (ah.fyr_end_dt) KEEP (DENSE_RANK FIRST ORDER BY ah.as_of_dt DESC), ' RETURNED NULL')
Of account_history ah
WHERE
Ah.acct_id = 999
AND trunc (ah.as_of_dt) < = 31 December 08 '
;
Hello
user4900730 wrote:
Moreover, in my example how I distinguish the case where a line really exists, but the column is null when there is no such thing as a line and the FIRST function returns the same value null? Hopefullly I should be able to do it in a single SQL and know the difference?
COUNT (*) > 0, but COUNT (col_x) = 0, then there is a line, but col_x happened to be null.
For example, the following query shows that there is 1 row in the group with the lowest name ("ADAMS"), but the column comm in all ranks of this group is null:
SELECT COUNT (*) KEEP (DENSE_RANK FIRST ORDER BY ename)
AS total_cnt
, COUNT (comm) KEEP (DENSE_RANK FIRST ORDER BY ename)
AS comm_cnt
FROM scott.emp
;
Output:
TOTAL_CNT COMM_CNT
---------- ----------
1 0
The employee whose highest name ("WARD") has a number in the comm column.
Tags: Database
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