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From: Alvaro Herrera <alvherre@commandprompt.com>
To: Tarlika Elisabeth Schmitz <postgresql@numerixtechnology.de>
Cc: pgsql-sql@postgresql.org
Subject: Re: extracting words
Date: Wed, 23 Apr 2008 09:13:03 -0400
Message-ID: <20080423131303.GE4768@alvh.no-ip.org> (raw)
In-Reply-To: <20080422222504.56bdb06d@dick.coachhouse>
References: <20080422222504.56bdb06d@dick.coachhouse>

Tarlika Elisabeth Schmitz wrote:

> I need to extract the words from department_name and product_name
> (words are separated by spaces) and get something like:
> 
> 1 cakes
> 1 desserts
> 1 apple
> 1 crumble
> 2 cakes
> 2 desserts
> 2 cheese
> 2 cake
> 3 starters
> 3 soups
> 3 french
> 3 onion
> 3 soup

regexp_split_to_table is handy (8.3 only):

select pk, regexp_split_to_table(product_name, '[& ]+') from products
union
select pk, regexp_split_to_table(dept_name, '[& ]+') from departments;

Add joins as desired.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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