Splitting records which has | delimiter [closed] - sql

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I'm having a two columns say Value column is having records like 'abc|comp|science|raja' and I want to split this records like abc,comp,science,raja and I need to compare it with another column say CHECKER which is having record as science
Value
abc|comp|science|raja
Checkers
science

Answer 1

You don't need to split the string and you don't even need a regular expression; just check whether the checker string (with leading a trailing delimiters) is a sub-string of value (with leading and trailing delimiters):
Oracle Setup:
CREATE TABLE your_table ( value, checker ) as
SELECT 'abc|comp|science|raja', 'science' FROM DUAL UNION ALL
SELECT 'abc|def|ghi', 'xyz' FROM DUAL UNION ALL
SELECT 'abc', 'abc' FROM DUAL UNION ALL
SELECT 'abcdef', 'abc' FROM DUAL
Query:
SELECT *
FROM your_table
WHERE '|' || value || '|' LIKE '%|' || checker || '|%';
Output:
VALUE | CHECKER
:-------------------- | :------
abc|comp|science|raja | science
abc | abc
db<>fiddle here

Answer 2

You can split your pipe delimited string in individual values and represent that as a table. Then you can just join to your Checkers table.
The web is full of examples, here are 2 ways to do it.
The REGEXP way...
WITH test_tab AS
(SELECT 'abc|comp|science|raja' str FROM dual
)
SELECT regexp_substr (str, '[^|]+', 1, rownum) split
FROM test_tab
CONNECT BY LEVEL <= LENGTH (regexp_replace (str, '[^|]+')) + 1;
If you have Application Express in your database, you can use apex_string to do the magic for you:
SELECT
column_value
FROM
TABLE(apex_string.split(
'abc|comp|science|raja',
'|'
));

Answer 3

Here's one option:
SQL> with test (id, value, checkers) as
2 (select 1, 'abc|comp|science|raja', 'science' from dual union all
3 select 2, 'xyz|bla|nothing' , 'zzz' from dual
4 )
5 select t.id,
6 regexp_substr(t.value, '[^\|]+', 1, column_value) val,
7 column_value rn,
8 t.checkers,
9 --
10 case when regexp_substr(t.value, '[^\|]+', 1, column_value) = t.checkers then 'Match'
11 else 'No match'
12 end what
13 from test t cross join table(cast(multiset(select level from dual
14 connect by level <= regexp_count(t.value, '\|') + 1
15 ) as sys.odcinumberlist))
16 order by t.id, rn;
ID VAL RN CHECKER WHAT
---------- --------------------- ---------- ------- --------
1 abc 1 science No match
1 comp 2 science No match
1 science 3 science Match
1 raja 4 science No match
2 xyz 1 zzz No match
2 bla 2 zzz No match
2 nothing 3 zzz No match
7 rows selected.
SQL>

Answer 4

It sounds like you just want to check whether the checker is in the value, in that case you can do this:
with mytable as
( select 'abc|comp|science|raja' value
, 'science' as checker
from dual
union all
select 'science|abc|comp|raja'
, 'science'
from dual
union all
select 'abc|comp|raja|science'
, 'science'
from dual )
select x.value
from mytable x
where regexp_like(value, '(^|\|)' || checker || '($|\|)')
The regex_like is searching inside the value for the checker with either a pipe or the end of the string, so it will match the keyword at the beginning, in the middle or at the end of the string. But it would not match "sciences".
Alternatively if you want to see all the rows and check whether they passed the "check" you could do:
with mytable as
( select 'abc|comp|science|raja' value
, 'science' as checker
from dual
union all
select 'science|abc|comp|raja'
, 'science'
from dual
union all
select 'abc|comp|raja|science'
, 'science'
from dual
union all
select 'abc|comp|raja|sciences'
, 'science'
from dual )
select x.value
, x.checker
, case when regexp_substr(value, '(^|\|)' || checker || '($|\|)') is not null
then 'Y'
end as passed
from mytable x