Re: [SQL] Expr Abbreviations/Functions?

Kenneth,

You could merge the fields and search with :

select * from tablex where lower(f1||f2||f3) ~ 'foo';




Troy

Troy Korjuslommi                Tksoft OY, Inc.
tjk@tksoft.com                  Software Development
                                Open Source Solutions
                                Hosting Services




>
> I find myself frequently typing (postgresql-6.5.1) the following:
>
>   SELECT * FROM table
>    WHERE (f1 ~* 'foo' OR f2 ~* 'foo' OR f3 ~* 'foo');
>
> Can "CREATE FUNCTION" be used?  Something like
>
>   CREATE FUNCTION f(string)
>    RETURNS bool
>    AS '(f1 ~* '$1' OR f2 ~* '$1' ...)';
>
> and then type
>
>   SELECT * FROM table WHERE f('foo');
>
>
> I tried to define such a function, but encountered two problems:
>
>  o It didn't "accept" the function's definition
>
>  o Syntax errors (apostrophes need escaping ... I tried mixing quotes
>    and apostrophes, also using '\' chars ... nothing seemed to work)
>
>
> I know that I can define VIEWs (and FUNCTIONs) that contain a specific
> SELECT statement, but I'd prefer to have definitions of just the
> repeating expressions.
>
>
> Another thing I'd like to "abbreviate" is the second phrase in
> SELECTs. E.g,
>
>     SELECT x FROM table;
>
> instead of
>
>     SELECT x1,x2,x3 FROM table;
>
> where 'x' is somehow equivalent to 'x1,x2,x3'.
>
>
> I read the online docs and searched a few SQL books, but can't seem to
> find the correct approach.  Ideas?
>
> Thanks for any help,
>
> -Prof Kenneth H Jacker       khj@cs.appstate.edu
> -Computer Science Dept       www.cs.appstate.edu/~khj
> -Appalachian State Univ
> -Boone, NC  28608  USA
>
>
>
>