Re: Substring

On Saturday 05 Sep 2009, bilal ghayyad wrote:
> I have an sql script function that take one text parameter "funct
> (text)", what I need to do is the following:
>
> If the parameter name is string and its value was for example "abcd"
> then I need to do a query based on ab and then based on the abc, how?
>
> Example:
>
> SELECT * from voipdb where prefix like string
>
> But I need the string to be ab and then to be abc? How I can assign
> the string to the first character and then to the first and second?
> In other words, how can I can take part of the string to do query on
> it?

From your example the following brute-force method should work (not
tested):

select * from voipdb where prefix like substring(string from 1 for 2) ||
'%' or prefix like substring(string from 1 for 3) || '%';

However, I don't understand why you'd want to search for both 'ab' and
'abc' in the same query, since the first condition is a superset of the
second one.

Regards,

-- Raju
--
Raj Mathur raju(at)kandalaya(dot)org http://kandalaya.org/
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