Re: How to build a query

In response to Krzysztof Walkiewicz :
> Hello everyone!
>
> In my table I have a column phone_numbers (varchar 30) that the
> telephone numbers are stored in the following way (13 signs with spaces):
>
> 032 321 24 25
> 032 341 24 85
> 032 345 24 87
>
> But in the same column there is also few hundred of mobile numbers that
> i want to copy to another table. They were written in the following way
> (11 signs with spaces):
>
> 606 605 504
> 506 504 548
> 879 504 152
>
> Now I have a question: how to built a query that will give me only the
> rows that are shorter than 13 signs (and maybe longer than 13 to check
> if there is no mistakes)?

You can use regular expressions, for instance:

test=*# select * from phone ;
t
---------------
032 321 24 25
606 605 504
(2 rows)

test=*# select * from phone where t ~ E'^[0-9]{3} [0-9]{3} [0-9]{2} [0-9]{2}$';
t
---------------
032 321 24 25
(1 row)

test=*# select * from phone where t ~ E'^[0-9]{3} [0-9]{3} [0-9]{3}$';
t
-------------
606 605 504
(1 row)

Regards, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99