| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | lockhart(at)alumni(dot)caltech(dot)edu (Thomas G(dot) Lockhart) |
| Cc: | hlefebvre(at)easynet(dot)fr, pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: AW: [HACKERS] isnull() or is it?t |
| Date: | 1998-12-09 15:47:08 |
| Message-ID: | 199812091547.KAA11125@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
> > With SyBase, IsNull(X,Y) returns X if X is not null, and Y
> > if X is null.
>
> Which is identical in behavior to the SQL92-defined function
> COALESCE(X,Y) (IsNull() is not in the standard). This is now in the
> Postgres development tree, to be available in the next release. Should
> we also have the less capable IsNull() available too? COALESCE() has the
> nice feature that it takes an unlimited number of arguments, returning
> the first non-null result.
Oh, NVL and isnull are not standard? Then let's just use coalesce. I
will remove them from the TODO list.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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