On Sunday 19 August 2001 21:50, Amar Kumar Padhi wrote:
> Hi,
> The need is to remove all spaces from a provided string, but if a space
> exists between two numbers, then it should not be removed. Look at the
> following examples.
>
> original string output required
> XT GB 100 XF 100 XTGB100XF100
> XT GB 123 X F 123 XTGB123XF123
> XT GB 100 100 XF XTGB100 100XF
>
> This has to be done in an sql query and not using pl/sql. Is this possible?
>
There's no practical way to do this in SQL without using some PL/SQL.
Fortunately, most of the PL/SQL is already in the database. I've used
a wrapper 'regex' below for the owa_pattern.change procedure, as the
owa_pattern.change function cannot be used in a SQL statement.
The 'regex' function can then be used in a SQL statement.
Enjoy.
Jared
-------------------------------------
drop table ttest;
create table ttest( before_data varchar2(30), after_data varchar2(30));
insert into ttest values('XT GB 100 XF 100', 'XTGB100XF100');
insert into ttest values('XT GB 123 X F 123', 'XTGB123XF123');
insert into ttest values('XT GB 100 100 XF', 'XTGB100 100XF ');
commit;
create or replace function regex(
line varchar2
, from_str varchar2
, to_str varchar2
) return varchar2
is
new_line varchar2(2000);
begin
new_line := line;
owa_pattern.change( new_line, from_str, to_str, 'g');
return new_line;
end;
/
show errors function regex
select
before_data,
-- convert ~ back to space
regex(
-- remove remaining spaces
regex(
-- convert all \d{sp}\d to \d{~}\d
regex(before_data, '([0-9]) +([0-9])', '\1~\2' )
,'\s+',''
)
,'~',' '
) converted_data,
after_data
from ttest
/
~
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--
Author: Jared Still
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