SQLite multi condition SELECT

[Djordhan]

HI there,

Here's the problem: A record can be Pending or Done.

I want to retrieve the oldest Pending item. But the following statement probably looks through the entire database (FROM Request) therefore select the oldest Done.

How can I select the oldest Pending ?

Is it even possible with SQLite or the function is only available in MySQL ?

WHERE Status='Pending' AND Date=(SELECT MIN(Date) FROM Request)

Thanks

[Spiff59]

I use AutoIt to access ADS (Advantage Database Server), but for a similar query, I don't bother with a compound select statement. Just something like: "SELECT MIN[DATE]) FROM TABLE WHERE [sTATUS] = 'Pending';"

Edit: Pardon, I may have spoken too soon, if you're after the entire record, then you're probably going the correct route with an embedded select. Such syntax does work fine for me, but that is accessing ADS and not SQLite. Perhaps SQLite only uses a subset of full SQL, and the MIN and MAX date functions are not available? That would be easily researched. Have you installed a COM error handling routine to retrieve the actual error data?

Edited September 19, 2011 by Spiff59

[jchd]

SQLite is ... well "Lite" but certainly not a toy. Standard SQL can do this easily, the only problem being that there's no such beast as "standard SQL" in practice. One good way to do that on any decent SQL RDBMS is:

select * from table where status = 'Pending' order by date asc limit 1;

If you have an index on date, then it should run very fast. Usefulness of such index mainly depends on selectivity of date and size of table (and average size of rows).

BTW SQLite does of course support Min, Max and any imbrication of subselects, up to insanity.

Edited September 19, 2011 by jchd

[Djordhan]

select * from table where status = 'Pending' order by date asc limit 1;

Works like a charm. Thank you!

[PsaltyDS]

BTW SQLite does of course support Min, Max and any imbrication of subselects, up to insanity.

"Imbrication"...had to google that one.

jchd = always educational. It's like reading George Will, but about RDBMS instead of baseball.

[jchd]

Sorry for that frenchism, if ever it's one. I could have used "complex arrangement" instead.