Retrieve any one maximum value from column containing array separated by semicolon in sql

Question

I have columns like

periodbal                  balancetype
-------------              -------------
0;15;11;-13;-16;20           ABS
22;25;-78;0;1                ABS
67;89;-36;83;90;55           ABS
…                            ACS
…

I want to retrieve

periodbal                  balancetype
---------                  -------------
20                            ABS
25                            ABS
90                            ABS

Answer 1

The idea here is:

for each value of balancetype, extract all the values from periodbal column, convert them in separate rows and then calculate maximum for each row's balancetype value.

i.e.

PERIODBAL   BALANCETYPE     ID
0           ABS             1
15          ABS             1
11          ABS             1
-13         ABS             1
-16         ABS             1
20          ABS             1

SPLIT FOR ROW#2

22        ABS          2
25        ABS          2
-78       ABS          2
0         ABS          2
1         ABS          2
......

FINALLY, FETCH MAX(PERIODBAL) and group the data by columns balancetype, ID

CREATE TABLE SYS.TEST
(
  PERIODBAL    VARCHAR2(50 BYTE),
  BALANCETYPE  VARCHAR2(5 BYTE)
)

INSERT INTO TEST VALUES ('0;15;11;-13;-16;20', 'ABS');
INSERT INTO TEST VALUES ('22;25;-78;0;1', 'ABS');
INSERT INTO TEST VALUES ('67;89;-36;83;90;55 ', 'ABS');
INSERT INTO TEST VALUES ('0;15;10;-13;-16;23', 'ACS');
INSERT INTO TEST VALUES ('0;14;11;-13;-16;25', 'ACS');

solution:

SELECT BALANCETYPE,MAX(BAL) AS PERIODBAL
FROM
(
SELECT SUB1.*, TRIM(REGEXP_SUBSTR( PERIODBAL, '[^;]+', 1, LVL)) BAL
FROM             (SELECT TEST.*, ROW_NUMBER() OVER (ORDER BY BALANCETYPE ) UNIQ_ID FROM TEST) SUB1 , 
                (SELECT LEVEL LVL FROM DUAL,(SELECT  MAX(LENGTH(REGEXP_REPLACE(PERIODBAL, '[^;]+')))+1 AS MAX_BAL FROM TEST)  TEMP
                 CONNECT BY LEVEL<= TEMP.MAX_BAL ) SUB2
WHERE LENGTH(REGEXP_REPLACE(PERIODBAL, '[^;]+'))+1>= SUB2.LVL
) GROUP BY BALANCETYPE, UNIQ_ID

output:

BALANCETYPE PERIODBAL
ACS         23
ABS         20
ABS         25
ABS         90
ACS         25

Hope it helped, Thanks.