Hi, I'm using PostgreSQL 6.5.1, and when I try to use IFNULL (listed
in the SQL Functions section of the docs in
/doc.html/user/functions.htm#AEN2121, as:
Table 5-1. SQL Functions Function Returns Description Example ... IFNULL(input,non-NULL substitute) non-NULL
returnsecond argument if first is NULL IFNULL(c1, 'N/A') ...
), psql complains about not knowing such a function:
albert=> select ifnull(NULL, 'ASDF');
ERROR: No such function 'ifnull' with the specified attributes
albert=> select ifnull(1, 2);
ERROR: No such function 'ifnull' with the specified attributes
What I really want to do is something like:
albert=> \d mailcalendar
Table = mailcalendar
+----------------------------------+----------------------------------+-------+
| Field | Type | Length|
+----------------------------------+----------------------------------+-------+
| base | datetime | 8 |
| repeat | reltime | 4 |
| offs | reltime | 4 |
| next | datetime | 8 |
| mail | text | var |
+----------------------------------+----------------------------------+-------+
albert=> select ifnull(next, base) as asdf from mailcalendar;
ERROR: No such function 'ifnull' with the specified attributes
What's wrong here? Am I just misusing this feature, or is it really
missing? I know that I can work around it by using case, but this is a
bit less convenient.
albert=> select case when next is null then base else next end as asdf from mailcalendar;
asdf
----------------------------
Sun Sep 26 00:00:00 1971 MET
(1 row)
Albert.
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