Solved

How can I pick this with sql?

Posted on 2015-02-17
5
238 Views
Last Modified: 2015-02-18
hi,

I have table where in one field the data is like

{name,100}
{name,101}
{name,102}
{secondname,200} {name,100}
{name,103}
{name,104}

so my goal is to pick 100 from here but when I use like bellow:

100
101
102
103
104

how can I do this with sql... i'm using postgress v8
0
Comment
Question by:hi4ppl
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 13

Expert Comment

by:Mark Bullock
ID: 40615936
Here's a way to get the result you want. You can play with this at SQL Fiddle http://sqlfiddle.com/#!11/8c057/5

CREATE TABLE mytable 
	(
     json varchar(30)
    );

INSERT INTO mytable
(json)
VALUES
('{name,100}'),
('{name,101}'),
('{name,102}'),
('{secondname,200} {name,100}'),
('{name,103}'),
('{name,104}');

select substring(json from 7 for 3)
from mytable
where json like '{name%';

Open in new window

0
 
LVL 1

Author Comment

by:hi4ppl
ID: 40615946
sorry I did mistake in providing the sample data well... here is the corrected one...

{name,10}
{name,101}
{name,10002}
{secondname,200} {name,1003}
{name,104}
{name,1005}

as the length of placement is not fixed ...plus thee placement of name sometimes moves....so the result that i'm looking for is :

 10
101
1002
1003
104
1005

thanks
0
 
LVL 48

Accepted Solution

by:
PortletPaul earned 500 total points
ID: 40615966
this would be far simpler in version 9.x

A way:
select
       replace(substring(thatpart,commapos+1), '}','') as picked
     , thatfield
from (
      select
             thatfield
           , split_part(thatfield, '} {', c+1) thatpart
           , strpos(split_part(thatfield, '} {', c+1), ',') commapos
      from (
            select
                    thatfield
                  , ((length(thatfield) - length(replace(thatfield,'} {',''))) / 3) as c
            from Table1
          ) x
     ) y
;

Open in new window


Or, without the nesting:
select
  replace(substring(split_part(thatfield, '} {', ((length(thatfield) - length(replace(thatfield,'} {',''))) / 3)+1),strpos(split_part(thatfield, '} {', ((length(thatfield) - length(replace(thatfield,'} {',''))) / 3)+1), ',')+1), '}','') as picked
, thatfield
from table1
;

Open in new window


Results:
| PICKED |                    THATFIELD |
|--------|------------------------------|
|     10 |                    {name,10} |
|    101 |                   {name,101} |
|  10002 |                 {name,10002} |
|   1003 | {secondname,200} {name,1003} |
|    104 |                   {name,104} |
|   1005 |                  {name,1005} |

Open in new window


see it at: http://sqlfiddle.com/#!11/90cff/2
0
 
LVL 1

Author Comment

by:hi4ppl
ID: 40615970
Hi,

thank you very much it looks good... but is there a way I can simplify this as I want to sometimes sum(thatfield) ...

regards
0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 40615979
Good luck with that simplification (note: if I could have I would have).

I don't use PostgreSQL every day, so there might be better ways I don't know about, and the job would be really simple if REVERSE() existed in 8.x (it's available in 9.x)

Plus you would have to add the necessary conversion to a number to perform a SUM(), and on top of that ensure you are only dealing with strings that can be converted to numbers.

Thus: I don't think so, but I could be wrong.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Access Report formatting issue 5 61
Disconnect idle or active sessions in a DB2 Database. 3 21
Displaying images within Access Form 6 66
Email question 19 82
When it comes to protecting Oracle Database servers and systems, there are a ton of myths out there. Here are the most common.
A Stored Procedure in Microsoft SQL Server is a powerful feature that it can be used to execute the Data Manipulation Language (DML) or Data Definition Language (DDL). Depending on business requirements, a single Stored Procedure can return differe…
This video shows how to copy a database user from one database to another user DBMS_METADATA.  It also shows how to copy a user's permissions and discusses password hash differences between Oracle 10g and 11g.
This video shows how to Export data from an Oracle database using the Original Export Utility.  The corresponding Import utility, which works the same way is referenced, but not demonstrated.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question