More redundant data removal!
Sorry to ask another question so fast, but the answer to my previous question was so triumphantly well, I thought I might give this one a go!I have a string: "power, station, power plant, generator, power plant.
Who turns in "power plant, generator, power plant.
The rules of this transformation are:
1 splits the string into units of Word separated by comma (I have a function to do).
2. test each word to see if it contains spaces.
3. If she has no seats, it is an expression. If it isn't, it's a stand-alone Word.
4. divide a phrase in its component words (so divided 'powerhouse' in 'power' and 'station', for example)
5. If one of the component words appear in the independent origin as words string, then the stand-alone Word fell, and only the expression is preserved.
So here's another example, if the string was 'red, hamster, food, Hutch, hamster in a red Hutch, water, the bottle', then the output should be "food, hamster in a red Hutch, water, the bottle". The words stand alone 'Reds', 'hamster' and 'hutch' are eliminated because they appear in the expression "hamster in a red Hutch.
There may be any number of words in a string. The string can contain a number of words in an order any. Would be nice if the output could be in alphabetical order. And I want a function to do this, by which I enter the string exactly as shown in my examples above, and the correct output is returned as a string.
I have a code that can do steps 1 through 4, but I can't nail the ILO to eliminate independent words of the original string while maintaining intact expression. And my code in any case plods still with nested for/next loops and a lot of if... then tests. Judging by the results of my previous question here, I'm sure there are better ways to do it. Can certain Wizard SQL direct me to magic, please?
A start...
(Tested for data)
SQL> create type var_table as table of varchar2(100);
2 /
Type created.
SQL> create or replace function fn(p_str varchar2) return varchar is
2 tok varchar2(100) := ' ';
3 str varchar2(4000) ;
4 i number := 0;
5 t var_table := var_table();
6 begin
7 while tok is not null
8 loop
9 i := i+1;
10 tok := ltrim(rtrim(regexp_substr(p_str,'[^,]+',1,i)));
11 if instr(tok,' ') = 0 then
12 if instr(p_str,tok||' ') = 0 and instr(p_str,' '||tok) = 0 then
13 t.extend;
14 t(t.count) := tok;
15 end if;
16 else
17 t.extend;
18 t(t.count) := tok;
19 end if;
20 end loop;
21 for rec in (select column_value from table(t) order by column_value) loop
22 str := str||','||rec.column_value;
23 end loop;
24 return ltrim(rtrim(str,','),',');
25 end;
26 /
Function created.
SQL> select fn('red,hamster,food,hutch,hamster in a red hutch,water,bottle') str from dual;
STR
--------------------------------------------------------------------------------
bottle,food,hamster in a red hutch,water
SQL> select fn('power, station, power plant, power generator, power station') str from dual;
STR
--------------------------------------------------------------------------------
power generator,power plant,power station
Published by: JAC on April 9, 2009 11:09
Areas of attack and trasiling managed
Tags: Database
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