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Getting unique values

Getting unique values

2006-06-29       - By Pooly

 Back
Reply:     1     2     3     4  

Hi,

2006/6/28, Chris Sansom <chris@(protected)>:
> I'm sure this is an elementary problem, but I can't get my head round it.
>
> I have two tables: pix and sections, the relevant bits of which are:
>
> pix (2,421 rows):
> picid       varchar(7)             not null
> sectionid   smallint(5) unsigned   not null
> caption     text                   null
>     picid and sectionid are a joint primary key
>     caption is full text indexed
>
> sections (a mere 152 rows):
> sectionid   smallint(5) unsigned   not null
> title       varchar(63)            not null
> blurb       text                   null
>     sectionid is primary key (auto increment)
>     title and blurb are full text indexed
>
> In pix, there may well be several instances of the same picid, but
> always with a different sectionid (obviously).
>
> The trouble is, this was originally set up with no intention of
> actually searching the tables, but now I want to. And I want to find
> the first instance of each picid that matches the text anywhere in
> caption, title or blurb, and get some other info at the same time.
> Oh, and for the time being it needs to be possible in MySQL 3.23.x.
>
> So far I'm doing a very simple:
>
> SELECT DISTINCT picid
> FROM pix AS p
> INNER JOIN sections AS s ON p.sectionid = s.sectionid
> WHERE caption LIKE '%searchterm%' OR title LIKE '%searchterm%'
>     OR blurb LIKE '%searchterm%'
> ORDER BY picid
>
> then as I loop through the results I'm more or less repeating the
> process to get the other information:
>
> SELECT p.sectionid, caption, title
> FROM pix AS p
> INNER JOIN sections AS s ON p.sectionid = s.sectionid
> WHERE (caption LIKE '%searchterm%' OR title LIKE '%searchterm%'
>     OR blurb LIKE '%searchterm%') AND p.picid = 'picid'
> LIMIT 1

If you know the picid previously retrieved, then the clause (caption
LIKE '%searchterm%' OR title LIKE '%searchterm%' OR blurb LIKE
'%searchterm%') is redundant, isn't it ?

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