Re: [PHP] SQL Select Unique() ?
On Thu, 19 Apr 2001, James, Yz wrote: Is there a method of extracting rows from a MySQL table Uniquely (as in only once) ?. For example, when a user performs a search, using two words, it may return the same row twice if the search is spread over two or more SQL selections. An example: I am not sure whether you can do it on mysql. On postgresql you can do a select distinct ... Anuradha -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] SQL Select Unique() ?
In article Pine.LNX.4.21.0105021106340.342-10@presario, [EMAIL PROTECTED] (Anuradha Ratnaweera) wrote: Is there a method of extracting rows from a MySQL table Uniquely (as in only once) ?. For example, when a user performs a search, using two words, it may return the same row twice if the search is spread over two or more SQL selections. An example: I am not sure whether you can do it on mysql. On postgresql you can do a select distinct ... The distinct keyword also works in mysql (the manual at mysql.com provides details). -- CC -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] SQL Select Unique() ?
On Fri, 20 Apr 2001 05:41, James, Yz wrote: Hi Guys, Is there a method of extracting rows from a MySQL table Uniquely (as in only once) ?. For example, when a user performs a search, using two words, it may return the same row twice if the search is spread over two or more SQL "selections". An example: If hypothetical row 129 is a Public House, but the public house doubles up as a restaurant, a search like this might return the same result twice. Here is our hypothetical pub: id = 129 name = The Blue Bell Inn category = Public House description = The Blue Bell Inn is a hypothetical pub, in the heart of rural England. Why not visit, have a drink and perhaps even dine in our fine Restaurant area. The user might perform the search, searching by "category" OR by "description". So if they typed "Public House / Restaurant" as the query, the following would occur: $sql = "SELECT * FROM table WHERE category LIKE 'Public House / Restaurant' OR description LIKE 'Public House / Restaurant'"; This of course won't select the hypothetical cae in question. Perhaps you might be betterr off using a dropdown list built from the table of categories that you are using as a lookup table (you are, aren't you?) Surely that would bring the same row back twice. Is there any way of selecting from the table just once, without having to restrict the search facility to something like: "SELECT * FROM table WHERE category LIKE '%$searchtext%'"; Again, that won't work in this case - you might want to separate the words in the search string and do an OR search on all the words. as opposed to having the "OR" in as well? Thanks, as always, James. Broadly, in this type of situation the row will only be returned once notwithstanding that it might meet several citeria. -- David Robley| WEBMASTER Mail List Admin RESEARCH CENTRE FOR INJURY STUDIES | http://www.nisu.flinders.edu.au/ AusEinet| http://auseinet.flinders.edu.au/ Flinders University, ADELAIDE, SOUTH AUSTRALIA -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] SQL Select Unique() ?
In article 9bng4u$ftc$[EMAIL PROTECTED],
[EMAIL PROTECTED] ("James, Yz") wrote:
$sql = "SELECT * FROM table WHERE category LIKE 'Public House / Restaurant'
OR description LIKE 'Public House / Restaurant'";
Surely that would bring the same row back twice
Surely not. Have you tried it yet? Unless there are duplicate rows in the
table (which should *not* be the case), each row that is matched by that
query should only be returned once per execution of the query.
Is there any way of
selecting from the table just once, without having to restrict the search
facility to something like:
"SELECT * FROM table WHERE category LIKE '%$searchtext%'";
as opposed to having the "OR" in as well?
I'm not sure what you're after. If executing the top example is getting
you unwanted rows, perhaps you could re-post with some sample data and
pointing out which rows are being shown in duplicate. (It might also be a
good idea to re-check your data first if there's any possibility that there
are duplicate rows existing in the db. 'Cuz that's the kind of thing
that's gonna mis-lead you about how SQL queries normally work.)
--
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