Re: Query optimization with X Y JOIN
От | Joshua D. Drake |
---|---|
Тема | Re: Query optimization with X Y JOIN |
Дата | |
Msg-id | 43D8FA03.304@commandprompt.com обсуждение исходный текст |
Ответ на | Re: Query optimization with X Y JOIN (J@Planeti.Biz) |
Список | pgsql-performance |
J@Planeti.Biz wrote: > If I want my database to go faster, due to X then I would think that > the issue is about performance. I wasn't aware of a paticular > constraint on X. > > I have more that a rudementary understanding of what's going on here, > I was just hoping that someone could shed some light on the basic > principal of this JOIN command and its syntax. Most people I ask, > don't give me straight answers and what I have already read on the web > is not very helpful thus far. What you are looking for is here: http://sqlzoo.net/ It is an excellent website that discusses in depth but at a tutorial style level how and what SQL is and how to use it. Including JOINS. FYI, a JOIN is basically a FROM with an integrated WHERE clause. That is a very simplified description and isn't 100% accurate but it is close. I strongly suggest the website I mentioned above as it will resolve your question. Joshua D. Drake -- The PostgreSQL Company - Command Prompt, Inc. 1.503.667.4564 PostgreSQL Replication, Consulting, Custom Development, 24x7 support Managed Services, Shared and Dedicated Hosting Co-Authors: PLphp, PLperl - http://www.commandprompt.com/
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