Oracle comma seperated to rows with grouping - oracle

Question

I have the following requirement.
Do we have direct functions available in oracle 12c to accomplish this.
create table t1(input_name varchar2(500),input_values varchar2(500));
insert into t1 values('a,b,c,d,','1,2,3,4');
insert into t1 values('e,f,g,','5,6,7');
insert into t1 values('a1,b1,c1,d1,','11,12,13,14');
insert into t1 values('d,c,b,a,','100,200,300,400');
commit;
select * from t1;
INPUT_NAME INPUT_VALUES
------------------------------ ----------------
a,b,c,d, 1,2,3,4
e,f,g, 5,6,7
a1,b1,c1,d1, 11,12,13,14
d,c,b,a, 100,200,300,400
output:
a b c d e f g a1 b1 c1 d1
1 2 3 4 5 6 7 11 12 13 14
400 300 200 100
Thanks,
Rahmat Ali

Answer 1

Yes... if you have a known set of input names. But you would be better reorganising your data so that you are not storing correlated pairs of comma-separated lists.
SQL Fiddle
Oracle 11g R2 Schema Setup:
create table t1(input_name,input_values) AS
SELECT 'a,b,c,d,','1,2,3,4' FROM DUAL UNION ALL
SELECT 'e,f,g,','5,6,7' FROM DUAL UNION ALL
SELECT 'a1,b1,c1,d1,','11,12,13,14' FROM DUAL UNION ALL
SELECT 'd,c,b,a,','100,200,300,400' FROM DUAL
/
CREATE TYPE pair IS OBJECT(
name VARCHAR2(20),
value VARCHAR2(20)
)
/
CREATE TYPE pair_table IS TABLE OF PAIR
/
Query 1:
SELECT MAX( CASE name WHEN 'a' THEN value END ) AS a,
MAX( CASE name WHEN 'b' THEN value END ) AS b,
MAX( CASE name WHEN 'c' THEN value END ) AS c,
MAX( CASE name WHEN 'd' THEN value END ) AS d,
MAX( CASE name WHEN 'e' THEN value END ) AS e,
MAX( CASE name WHEN 'f' THEN value END ) AS f,
MAX( CASE name WHEN 'g' THEN value END ) AS g,
MAX( CASE name WHEN 'a1' THEN value END ) AS a1,
MAX( CASE name WHEN 'b1' THEN value END ) AS b1,
MAX( CASE name WHEN 'c1' THEN value END ) AS c1,
MAX( CASE name WHEN 'd1' THEN value END ) AS d1
FROM (
SELECT v.name,
v.value,
ROW_NUMBER() OVER ( PARTITION BY v.name ORDER BY ROWNUM ) AS rn
FROM t1 t
CROSS JOIN
TABLE(
CAST(
MULTISET(
SELECT pair(
REGEXP_SUBSTR( t.input_name, '([^,]+)(,|$)', 1, LEVEL, NULL, 1 ),
REGEXP_SUBSTR( t.input_values, '([^,]+)(,|$)', 1, LEVEL, NULL, 1 )
)
FROM DUAL
CONNECT BY level <= REGEXP_COUNT( t.input_name, '([^,]+)(,|$)' )
) AS pair_table
)
) v
)
GROUP BY rn
Results:
| A | B | C | D | E | F | G | A1 | B1 | C1 | D1 |
|-----|-----|-----|-----|--------|--------|--------|--------|--------|--------|--------|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 11 | 12 | 13 | 14 |
| 400 | 300 | 200 | 100 | (null) | (null) | (null) | (null) | (null) | (null) | (null) |
You can also use a PIVOT statement rather than multiple MAX( CASE ... END ) statements.
If you do not have a static set of input names then you will need to search for dynamic pivots.
Update:
Is there a way where I can avoid using types?
You can avoid creating types and just use a built-in VARRAY or collection like SYS.ODCIVARCHAR2LIST but then you will need two lists and it becomes complicated to correlate between the two.
WITH input_names ( rid, idx, name ) AS (
SELECT t.ROWID,
ROW_NUMBER() OVER ( PARTITION BY t.ROWID ORDER BY ROWNUM ) AS rn,
v.COLUMN_VALUE
FROM t1 t
CROSS JOIN
TABLE(
CAST(
MULTISET(
SELECT REGEXP_SUBSTR( t.input_name, '([^,]+)(,|$)', 1, LEVEL, NULL, 1 )
FROM DUAL
CONNECT BY level <= REGEXP_COUNT( t.input_name, '([^,]+)(,|$)' )
) AS SYS.ODCIVARCHAR2LIST
)
) v
),
input_values ( rid, idx, value ) AS (
SELECT t.ROWID,
ROW_NUMBER() OVER ( PARTITION BY t.ROWID ORDER BY ROWNUM ) AS rn,
v.COLUMN_VALUE
FROM t1 t
CROSS JOIN
TABLE(
CAST(
MULTISET(
SELECT REGEXP_SUBSTR( t.input_values, '([^,]+)(,|$)', 1, LEVEL, NULL, 1 )
FROM DUAL
CONNECT BY level <= REGEXP_COUNT( t.input_values, '([^,]+)(,|$)' )
) AS SYS.ODCIVARCHAR2LIST
)
) v
),
correlated ( name, value, rn ) AS (
SELECT n.name,
v.value,
ROW_NUMBER() OVER ( PARTITION BY n.name
ORDER BY ROWNUM )
FROM input_names n
INNER JOIN
input_values v
ON ( n.rid = v.rid AND n.idx = v.idx )
)
SELECT MAX( CASE name WHEN 'a' THEN value END ) AS a,
MAX( CASE name WHEN 'b' THEN value END ) AS b,
MAX( CASE name WHEN 'c' THEN value END ) AS c,
MAX( CASE name WHEN 'd' THEN value END ) AS d,
MAX( CASE name WHEN 'e' THEN value END ) AS e,
MAX( CASE name WHEN 'f' THEN value END ) AS f,
MAX( CASE name WHEN 'g' THEN value END ) AS g,
MAX( CASE name WHEN 'a1' THEN value END ) AS a1,
MAX( CASE name WHEN 'b1' THEN value END ) AS b1,
MAX( CASE name WHEN 'c1' THEN value END ) AS c1,
MAX( CASE name WHEN 'd1' THEN value END ) AS d1
FROM correlated
GROUP BY rn;