Skip site navigation (1) Skip section navigation (2)

COPY command, linking foreign keys

From: Srinivas Iyyer <srini_iyyer_bio(at)yahoo(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: COPY command, linking foreign keys
Date: 2005-12-18 13:59:42
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
Hello group:

I am working on a huge datasets (every dataset will
have over 50K lines and I have 100 such datasets).
Previously I wrote SQL statements (inserts and insert
within Insert statements). 

However, the process went on and on for days due to
many lines and large number of datasets. 

I am about to try COPY command. Here is snippet of my

Table Gene:

gene_no |  gene_name
   1    |     abc
   2    |     def
   3    |     kir
   .    |     ...
   .    |     ...
   N    |     xxx

Here is how my data looks in a tab delim format:

gene_name     expr_value    exp_value2
 def             100.9        300.3
 kir             200.4        334.4
 sir              39.9          4.9
 ..               ....        .....
(30K lines like these)

Now I want to use copy command and upload this whole
tab delim file into the following table:

Table: exp

exp_no  |  gene_no(FK)  | exp_one | exp_two

There are two questions :

1. In table 'exp' I have gene_no and not gene_name. In
the tab delim file I have gene_name.  So, what is the
ideal way to link these up - a fast one after 
'COPY'ing this tab delim file in to exp_table.  should
I include gene_name also into the 'exp' table or ask
postgres to link up with 'Gene' table through
'gene_no' foreign key.
2. Can this be done by simple SQL statement or should
I have to write a pl/pgql script. 

would any one please help me in teaching to get around
this problem.

Thank you.

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 

In response to


pgsql-novice by date

Next:From: John DeSoiDate: 2005-12-18 14:00:00
Subject: Re: Login problem
Previous:From: stig eriksonDate: 2005-12-18 11:44:01
Subject: how do i add a number of days to now()?

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group