SQL Query to get count of words in table - sql

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