Comments on: the mystery of querying

By: Cine

Cine — Tue, 29 Mar 2005 13:15:10 +0000

Oooh, okay, I see. I didn’t know that, thanks!

By: Dianna

Dianna — Sat, 26 Mar 2005 16:51:49 +0000

interesting! i would have used the first… thanks for the tip!

By: dodo

dodo — Sat, 26 Mar 2005 00:54:17 +0000

If you are selecting only a few rows with LIMIT, MySQL uses indexes in some cases when normally it would prefer to do a full table scan.

form here it's not about the result, it's about optimizing and speed. you are welcome to do a test compare two queries with limit and without using that debug class. on average, with limit is always faster. again because reason above. so it's always a good idea to use LIMIT 1 even if you don't need it.

By: Cine

Cine — Sat, 26 Mar 2005 00:20:47 +0000

Oi, complicated. Joining tables are just too far out of my league so far. But out of curiosity – why the LIMIT 1? If the uids are unique -which they should be- is it really necessary?

By: Semi Sweet

Semi Sweet — Fri, 25 Mar 2005 06:34:05 +0000

Complicated. Makes me want to take at least an intro computer science class. :biggrin:

By: Daynah

Daynah — Fri, 25 Mar 2005 05:37:11 +0000

Very interesting. I wonder why that is. Maybe there’s less joining of tables on the second query?