Oracle - Comparing multiple records - sql

Question

I am stuck with a strange scenario now.
I have a table with many records. A few of which looks like:
Table 1:
----------------------------------------------
M_ID ROLE_ID
----------------------------------------------
idA adVA12^~^dsa25
idA adsf32^~^123^~^asdf32
idA hdghf45
idB fdngfhlo43^~^
idB pnsdfmg23
idC 123ghaskfdnk
idC hafg32^~^^~^gasdfg
----------------------------------------------
and Table 2:
-----------------------------------------------------------
ROLE_ID ADDR1 ADDR2 ADDR3
-----------------------------------------------------------
adVA12^~^dsa25 18 ben street
adsf32^~^123^~^asdf32 24 naruto park
hdghf45 18 ben street
fdngfhlo43^~^ 40 spartan ave
pnsdfmg23 40 spartan ave
123ghaskfdnk 14 southpark ave
hafg32^~^^~^gasdfg 88 brooks st
-----------------------------------------------------------
I have these tables linked by ROLE_ID.
My requirement is that, all the ROLE_IDs of a single M_ID in Table 1 must be compared for their address fields in Table 2. In case if the address of all the ROLE_IDs corresponding to that single M_ID is not the same in Table 2, it should be returned.
i.e., in this case, my result should be:
-----------------------------
M_ID ROLE_ID
-----------------------------
idA adVA12^~^dsa25
idA adsf32^~^123^~^asdf32
idA hdghf45
-----------------------------
the M_ID, and the corresponding ROLE_IDs.
I have no idea on how to compare multiple records.

Answer 1

I'd join the tables and count the distinct number of addresses:
SELECT m_id, role_id
FROM (SELECT t1.m_id AS m_id,
t1.role_id AS role_id,
COUNT(DISTINCT t2.addr1 || '-' || t2.addr2 || '-' || t2.addr3)
OVER (PARTITION BY t1.m_id) AS cnt
FROM t1
JOIN t2 ON t1.role_id = t2.role_id) t
WHERE cnt > 1

Answer 2

Slightly different approach:
SELECT t1.m_id, substr(sys.stragg(',' || t1.role_id),2) Roles,
t2.ADDR1, t2.ADDR2, t2.ADDR3
FROM t1
JOIN t2 ON t1.role_id = t2.role_id
GROUP BY t1.m_id, t2.ADDR1, t2.ADDR2, t2.ADDR3;
"M_ID" "ROLES" "ADDR1" "ADDR2" "ADDR3"
"A" "A1,A2,A3,A5,A6,A7" "1" "2" "3"
"A" "A4" "4" "2" "3"
You could add HAVING COUNT(0) > 1 to get all with matches, or use HAVING COUNT(0) = 1 to get all instances that are only used once, or use it without a HAVING to get a summary.
I used the following test data:
CREATE TABLE TEST_ROLE (
ID INTEGER PRIMARY KEY,
M_ID VARCHAR2(32) NOT NULL,
ROLE_ID VARCHAR2(256) NOT NULL
);
CREATE TABLE TEST_ROLE_ADDRESS (
ROLE_ID VARCHAR2(256) NOT NULL,
ADDR1 VARCHAR2(1000),
ADDR2 VARCHAR2(1000),
ADDR3 VARCHAR2(1000)
);
INSERT INTO TEST_ROLE VALUES(1, 'A', 'A1');
INSERT INTO TEST_ROLE VALUES(2, 'A', 'A2');
INSERT INTO TEST_ROLE VALUES(3, 'A', 'A3');
INSERT INTO TEST_ROLE VALUES(4, 'A', 'A4');
INSERT INTO TEST_ROLE VALUES(5, 'A', 'A5');
INSERT INTO TEST_ROLE VALUES(6, 'A', 'A6');
INSERT INTO TEST_ROLE VALUES(7, 'A', 'A7');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A1', '1', '2', '3');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A2', '1', '2', '3');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A3', '1', '2', '3');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A4', '4', '2', '3');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A5', '1', '2', '3');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A6', '1', '2', '3');
INSERT INTO TEST_ROLE_ADDRESS VALUES ('A7', '1', '2', '3');