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Re: how to build this list ?

From: Masaru Sugawara <rk73(at)sea(dot)plala(dot)or(dot)jp>
To: juerg(dot)rietmann(at)pup(dot)ch
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: how to build this list ?
Date: 2002-05-17 16:51:50
Message-ID: 20020518011016.6B66.RK73@sea.plala.or.jp (view raw or flat)
Thread:
Lists: pgsql-sql
On Thu, 16 May 2002 14:38:02 +0200
juerg(dot)rietmann(at)pup(dot)ch wrote:

> The list I need :
> 
> 11111111 (main order)
>             8888  01 (cylinderid, type)
>             7986  01 (cylinderid, type)
>             8732  01 (cylinderid, type)
>       11111112 (suborder)
>             9876  03 (cylinderid, type)
>             4318  03 (cylinderid, type)
>       11111113 (suborder)
>             7654  02 (cylinderid, type)
>             6653  02 (cylinderid, type)
>       11111114 (suborder)
>       11111115 (suborder)
> 22222221 (main order)
>             8866  03 (cylinderid, type)
>       22222222 (suborder)
>             8796  03 (cylinderid,type)
>             9876  03 (cylinderid,typ)
>       22222223 (suborder)
> 


Hi, Juerg.
Based on the analysis of that relations, I would think  "4532 04 (cylinderid, type)"
should be selected...  Your careless mistake ?   If so, one of the possible
resolution is:


CREATE TABLE tbl_order (orderid text, main boolean);
CREATE TABLE cylinder (cylinderid text, type text, orderid text);

SELECT t.list
  FROM (SELECT NULL AS orderid,
               c1.cylinderid,
               c1.digit7,
               c1.digit1, 
               '            ' || c1.cylinderid || ' ' || c1.type ||
                    ' ' || '(cylinderid, type)' AS list
          FROM tbl_order AS o1 INNER JOIN
               (SELECT cylinderid, type, orderid,
                       substring(orderid from 1 for 7) AS digit7,
                       substring(orderid from 8 for 1) AS digit1
                  FROM cylinder
               ) AS c1 ON (c1.orderid  = o1.orderid)
        UNION
        SELECT o2.orderid,
               NULL AS cylinderid,
               substring(o2.orderid from 1 for 7),
               substring(o2.orderid from 8 for 1),
               CASE WHEN o2.main = true
                    THEN o2.orderid || ' (main order)'
                    ELSE '      ' || o2.orderid || ' (suborder)'
               END AS list
          FROM tbl_order AS o2
      ) AS t
ORDER BY t.digit7, t.digit1, t.orderid, t.cylinderid


Regards,
Masaru Sugawara



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