Question

I have a table which have schema like this

id name

1 jack
2 jack of eden
3 eden of uk
4 m of s

I want to execute a query which gives me count of words like this

count word
2 jack
2 eden
3 of

this means jack has been here 2 times, eden 2 times and of has been 3 times.

Hope you got the question, m trying too but not getting the right query or approach to it

thnx

Answer 1

Assuming your table is named temp (probably not – change it to the right name of your table)

I used a subquery for finding all the words in your table:

select distinct regexp_substr(t.name, '[^ ]+',1,level) word , t.name, t.id
     from temp t
     connect by level <= regexp_count(t.name, ' ') + 1

this query splits all the words from all records. I aliased it words.
Then I joined it with your table (in the query it’s called temp) and counted the number of occurences in every record.

select words.word, count(regexp_count(tt.name, words.word))
from(
select distinct regexp_substr(t.name, '[^ ]+',1,level) word , t.name, t.id
 from temp t
 connect by level <= regexp_count(t.name, ' ') + 1) words, temp tt
 where words.id= tt.id
 group by words.word

You can also add:

having count(regexp_count(tt.name, words.word)) > 1

---

update: for better performance we can replace the inner subquery with the results of a pipelined function:
first, create a schema type and a table of it:

create or replace type t is object(word varchar2(100), pk number);
/
create or replace type t_tab as table of t;
/

then create the function:

create or replace function split_string(del in varchar2) return t_tab
  pipelined is

  word    varchar2(4000);
  str_t   varchar2(4000) ;
  v_del_i number;
  iid     number;

  cursor c is
    select * from temp; -- change  to your table

begin

  for r in c loop
    str_t := r.name;
    iid   := r.id;

    while str_t is not null loop

      v_del_i := instr(str_t, del, 1, 1);

      if v_del_i = 0 then
        word  := str_t;
        str_t := '';
      else
        word  := substr(str_t, 1, v_del_i - 1);
        str_t := substr(str_t, v_del_i + 1);
      end if;

      pipe row(t(word, iid));

    end loop;

  end loop;

  return;
end split_string;

now the query should look like:

select words.word, count(regexp_count(tt.name, words.word))
from(
select word, pk as id from table(split_string(' '))) words, temp tt
 where words.id= tt.id
 group by words.word