Re: blanking out repeated columns in rows

On Thu, 09 May 2002 01:51:59 +0900
Masaru Sugawara  wrote:

> 
> How about this method of appending sequences as unique indices?
> 
> 
> First:
> create temp sequence dna_rownum1;
> create temp sequence dna_rownum2;
> 
> Secand:
> SELECT setval('dna_rownum1', 1, false);   -- (1)
> SELECT setval('dna_rownum2', 1, false);   -- (2)
> SELECT (CASE WHEN t1.idx = t3.idx THEN t1.tag ELSE NULL END) AS tag,


I'm sorry. This one is simpler.

SELECT (CASE WHEN t1.oid = t2.idx THEN t1.tag ELSE NULL END) AS tag,              t1.gb_id,              t1.pos,              t1.descrip FROM  dna AS t1,             (SELECT tag, MIN(oid) AS idx                 FROM dna               GROUP BY tag             ) AS t2WHERE t1.tag = t2.tagORDER BY t1.tag, t1.oid;  



Regards,
Masaru Sugawara