How to retrieve comma seperated vales in the same column in Oracle SQL

Question

Dear Members
Please provide me the solution to the below question
Oracle table
Ename Product
A 1,2,3
B 1,2,3
Product column has data like that only separated by commas
Output should be like this.
Ename, Product
A 1
A 2
A 3
B 1
B 2
B 3
Can we get the above output using Just Oracle SQL select statement?.
I have tried in Google I got an answer in SQL server,it has something called “Cross apply split” function, I am not sure in Oracle.

Answer 1

876639 wrote:
Thanks for your answer, it's perfectly worked.Efficiency wise it is quite costly solution it builds hierarchy betwenn every row/level. As a result we end up building huge hierarchy while we need just few rows:
with t as (
           select 'A' ename, '1' product from dual union
           select 'B', '1,2' from dual union
           select 'C', '1,2,3' from dual union
           select 'D', '1,2,3,4' from dual union
           select 'E', '1,2,3,4,5' from dual
SELECT count(*),
       count(distinct ename || regexp_substr (product, '[^,]+', 1, level)) 
   FROM t
   CONNECT BY LEVEL <= LENGTH (REGEXP_REPLACE (product, '[^,]+'))  + 1
  COUNT(*) COUNT(DISTINCTENAME||REGEXP_SUBSTR(PRODUCT,'[^,]+',1,LEVEL))
       325                                                           15
SQL> As you can see, code builds 325 row hierarchy while returns just 15 rows. The following solution builds exactly as many rows as we need:
with t as (
           select 'A' ename, '1' product from dual union
           select 'B', '1,2' from dual union
           select 'C', '1,2,3' from dual union
           select 'D', '1,2,3,4' from dual union
           select 'E', '1,2,3,4,5' from dual
SELECT  count(*),
        count(ename || regexp_substr(product,'[^,]+',1,column_value))
  FROM  t,
        table(
              cast(
                   multiset(
                            select  level
                              from  dual
                              connect by level <= length(product) - length(replace(product,',')) + 1
                   as sys.OdciNumberList
  COUNT(*) COUNT(ENAME||REGEXP_SUBSTR(PRODUCT,'[^,]+',1,COLUMN_VALUE))
        15                                                          15
with t as (
           select 'A' ename, '1' product from dual union
           select 'B', '1,2' from dual union
           select 'C', '1,2,3' from dual union
           select 'D', '1,2,3,4' from dual union
           select 'E', '1,2,3,4,5' from dual
SELECT  ename,
        regexp_substr(product,'[^,]+',1,column_value)
  FROM  t,
        table(
              cast(
                   multiset(
                            select  level
                              from  dual
                              connect by level <= length(product) - length(replace(product,',')) + 1
                   as sys.OdciNumberList
E REGEXP_SU
A 1
B 1
B 2
C 1
C 2
C 3
D 1
D 2
D 3
D 4
E 1
E REGEXP_SU
E 2
E 3
E 4
E 5
15 rows selected.
SQL> SY.