Function to Generate a Sequential incremental Number by Group of Records

Question

I have a table with several columns and I need to compute a sequential number by group of records
FIELD1 FIELD2 FIELD3 FIELD4 FIELD5
AAAAAA A1 JOHN 01/01/61 NULL
AAAAAA A3 PAUL 01/01/71 NULL
AAAAAA A3 MARY 01/01/02 NULL
AAAAAA A4 CARL 01/01/04 NULL
BBBBBB A1 MARK 01/01/60 NULL
BBBBBB A2 ALLY 01/01/60 NULL
BBBBBB A5 JUAN 01/01/04 NULL
I need to compute FIELD5. This is defined as a number field.
Records where FIELD2 = A1 the default value for FIELD5 is zero.
I am grouping records by FIELD1, FIELD4
The value for FIELD5 will be assigned from 1 TO 1+N
For this sample, the resulting records will look like this;
FIELD1 FIELD2 FIELD3 FIELD4 FIELD5
AAAAAA A1 JOHN 01/01/61 0
AAAAAA A3 PAUL 01/01/71 1
AAAAAA A3 MARY 01/01/02 2
AAAAAA A4 CARL 01/01/04 3
BBBBBB A1 MARK 01/01/60 0
BBBBBB A2 ALLY 01/01/60 1
BBBBBB A5 JUAN 01/01/04 2
Question: Can I create a function that loops through the table and compute the value for FIELD5?

Answer 1

I like this idea, but because F2 must always have the value of ZERO I decided to create a procedure to calculate the value for F5.
My procedure is below;
The issue I am having is that I am not sure;
1) When/where to set/reset the counter ?
2) Determine in the inner loop if I am still whithin the same group of records ?
3) When to update the new found value for MBR_MBR_DEP_CD field ?
CREATE OR REPLACE PROCEDURE LC_BUILD_DEP_CODE_PROC IS
V_ALT_ID VARCHAR2(30);
V_EMPLOYEE_SSN VARCHAR2(9);
--RELATIONSHIP_CD VARCHAR2(2);
--MBR_DOB         DATE;
V_ALT_ID_2 VARCHAR2(30);
V_EMPLOYEE_SSN_2 VARCHAR2(9);
V_MBR_DEP_CD_2 NUMBER(2,0);
V_MBR_DEP_COUNTER INTEGER :=0;
/* FIRST CURSOR */
CURSOR GET_FAM_ALT_ID IS
SELECT FAM.ALT_ID,
FAM.EMPLOYEE_SSN
FROM TPA_MBR_STG FAM
WHERE FAM.RELATIONSHIP_CD = '18'
ORDER BY FAM.ALT_ID;
/* SECOND CURSOR */
CURSOR GET_MBR_DEP_CD IS
SELECT MBR.ALT_ID,
MBR.EMPLOYEE_SSN,
MBR.MBR_DOB,
MBR.MBR_DEP_CD
FROM TPA_MBR_STG MBR
--WHERE MBR.ALT_ID = V_ALT_ID
--AND   MBR.EMPLOYEE_SSN = V_EMPLOYEE_SSN
WHERE MBR.RELATIONSHIP_CD <> '18'
ORDER BY MBR.ALT_ID, MBR.MBR_DOB;
BEGIN
-- OPEN FIRST CURSOR
OPEN GET_FAM_ALT_ID;
LOOP
FETCH GET_FAM_ALT_ID INTO V_ALT_ID,
V_EMPLOYEE_SSN;
OPEN GET_MBR_DEP_CD;
FETCH GET_MBR_DEP_CD INTO V_ALT_ID_2,
V_EMPLOYEE_SSN_2;
IF V_ALT_ID_2 = V_ALT_ID
AND V_EMPLOYEE_SSN_2 = V_EMPLOYEE_SSN
THEN
LOOP
V_MBR_DEP_COUNTER = V_MBR_DEP_COUNTER + 1;
UPDATE TPA_MBR_STG
SET MBR_MBR_DEP_CD = V_MBR_DEP_COUNTER;
END LOOP;
END IF;
CLOSE GET_MBR_DEP_CD;
V_MBR_DEP_COUNTER :=0;
END LOOP;
CLOSE GET_FAM_ALT_ID;
EXCEPTION
WHEN OTHERS THEN
RAISE_APPLICATION_ERROR(-20001,'AN ERROR WAS ENCOUNTERED - '||SQLCODE||' -
ERROR- '||SQLERRM);
END LC_BUILD_DEP_CODE_PROC;