Table Comparison to pull back non matching data

Question

Hello,
I have been working on the below for a few days now and cannot figure out how to get the desired results. Was hoping someone could point me in the right direction. I have attached the data below and the queries I have come up with so far. I only need data for MU_ID (3,7,4) and only need SKILL_NM ('THICV','HELPDESK_FOUNDATIONAL','SPANISH','AUTO','HELPDESK_COMPLEX','HOUSE_COMPLEX','BOAT','HOUSE','HELPDESK','HELPDESK_MODERATE') as there are hundreds more in the actual tables. I also have the problem of the skill levels for the foundational, moderate, complex skill names from the IEX table. If SKILL_LEVEL is 0-2 on the GEN table they are listed as _FOUNDATIONAL in the IEX table, 3-7 is _MODERATE, 8-10 is _COMPLEX but only for the SKILL_NM 'HELPDESK' & 'HOUSE'.
CREATE TABLE IEX(
  MU_ID         NUMBER(5),
  AGENT_NM      VARCHAR2(30),
  EXTERNAL_ID   VARCHAR2(8),
  SKILL_NM      VARCHAR2(50))
CREATE TABLE GEN(
  USER_ID       VARCHAR2(8),
  SKILL_NM      VARCHAR2(255),
  SKILL_LEVEL   NUMBER(10))
INSERT INTO IEX(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(3,'ROBERTS,CHRIS','ROBERT1','THICV')
INSERT INTO IEX(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(3,'ROBERTS,CHRIS','ROBERT1','HELPDESK_FOUNDATIONAL')
INSERT INTO IEX(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(7,'SEW,HEATHER','SEW1','SPANISH')
INSERT INTO IEX(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(7,'SEW,HEATHER','SEW1','AUTO')
INSERT INTO IEX(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(4,'PRATT,MIKE','PRATT2','HOUSE_COMPLEX')
INSERT INTO IEX(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(4,'PRATT,MIKE','PRATT2','HELPDESK_MODERATE')
INSERT INTO IEX(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('ROBERT1','THICV',1)
INSERT INTO IEX(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('ROBERT1','HELPDESK',7)
INSERT INTO IEX(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('SEW1','SPANISH',1)
INSERT INTO IEX(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('SEW1','BOAT',1)
INSERT INTO IEX(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('PRATT2','HOUSE',9)
INSERT INTO IEX(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('PRATT2','HELPDESK',2)
DESIRED RESULTS:
MU_ID      AGENT_NM                EXTERNAL_ID      IEX_SKILL_NM                                GEN_SKILL_NM      SKILL_LEVEL
3                ROBERTS,CHRIS      ROBERT1            NULL                                                     HELPDESK                7
3                ROBERTS,CHRIS      ROBERT1            HELPDESK_FOUNDATIONAL      NULL                           NULL
7                SEW,HEATHER           SEW1                      AUTO                                                NULL                           NULL
7                SET,HEATHER           SEW1                      NULL                                                     BOAT                           1
4                PRATT,MIKE                PRATT2                 HELPDESK_MODERATE                     NULL                           NULL
4                PRATT,MIKE                PRATT2                 NULL                                                          HELPDESK                2
I wrote the 2 below queries, the first one is getting some of the data I need, but not all of it. The second one was something I was playing around with to see if it would do that I need, looks kinda like it works but pulling back way more data than I need and I cannot figure out how to have the skill level data in it.
SELECT
A.MU_ID,
A.AGENT_NM,
A.EXTERNAL_ID,
A.SKILL_NM
FROM IEX A
WHERE
  A.mu_id IN
   ('3', '4', '7') AND
  UPPER (A.AGENT_NM) NOT LIKE ('%Temp%') AND
    A.EXTERNAL_ID IS NOT NULL
AND A.SKILL_NM NOT IN
(SELECT B.SKILL_NM
FROM GEN B
WHERE A.EXTERNAL_ID = B.USER_ID
and A.SKILL_NM = B.SKILL_NM)
ORDER BY AGENT_NM ASC
(SELECT
   A.EXTERNAL_ID,
   A.SKILL_NM
FROM
   IEX A
WHERE
   A.MU_ID IN ('3', '4', '7')
MINUS
SELECT
   B.USER_ID,
   B.SKILL_NM
FROM
   GEN B
WHERE
   B.SKILL_NM IN
     ('THICV',
      'HELPDESK_FOUNDATIONAL',
      'SPANISH',
      'AUTO',
      'HELPDESK_COMPLEX',
      'HOUSE_COMPLEX',
      'BOAT',
      'HOUSE',
      'HELPDESK',
      'HELPDESK_MODERATE'))
UNION ALL
(SELECT
   B.USER_ID,
   B.SKILL_NM
FROM
   GEN B
WHERE
   B.SKILL_NM IN
     ('THICV',
      'HELPDESK_FOUNDATIONAL',
      'SPANISH',
      'AUTO',
      'HELPDESK_COMPLEX',
      'HOUSE_COMPLEX',
      'BOAT',
      'HOUSE',
      'HELPDESK',
      'HELPDESK_MODERATE')
MINUS
SELECT
   A.EXTERNAL_ID,
   A.SKILL_NM
FROM
   IEX A
WHERE
   A.MU_ID IN ('3', '4', '7'))

Answer 1

Thanks Frank,
I guess I explained it wrong. What you provided does pull back non matching data but is also pulling back matching data. Below is the exact query I am using and sample data. What is need  to show all skill_nm that do not match each other from both table. There are a handful of skill_nm that I have to use a condition with levels to make them match up based on "complex" "moderate" "foundational" but only these few need to have that condition and everything else is just straight up does skill_nm from a = skill_nm.
My current query:
SELECT
  A.MU_ID,
  A.AGENT_NM,
  B.USER_ID AS EXTERNAL_ID,
  A.SKILL_NM AS IEX_SKILL_NM,
  B.SKILL_NM AS GEN_SKILL_NM,
  B.SKILL_LEVEL
FROM
  LIGHTHOUSE.IEX_AGT_SKILL A
  FULL OUTER JOIN
  LIGHTHOUSE.CFG_PERSON_SKILL_VALUES B
    ON A.EXTERNAL_ID = B.USER_ID AND
       A.SKILL_NM = B.SKILL_NM
     || CASE
            WHEN B.SKILL_NM NOT IN ('THIPayment','THIPL','SPSC') THEN NULL
          WHEN B.SKILL_LEVEL <= 2 THEN '_FOUNDATIONAL'
        WHEN B.SKILL_LEVEL <= 7 THEN '_MODERATE'
      WHEN B.SKILL_LEVEL <= 10 THEN '_COMPLEX'
     END AND
            A.MU_ID IN
         ('3','4','5','6','7','12','14','220','222','410','411','412','413','414','415','480','600','650','717','720','721',
          '722','723','800','801','3008','3010','3012','3100','4200','4201','4202','4203','4400','4401','4402','4404')
Doing this, it is looking at the SKILL_LEVEL for all SKILL_NM and pulling back things that do match, but not on the level. I only need to have skill level match up for:
GENESYS
IEX
SKILL LEVEL
THIPayment
THIPayment_Complex
8 to 9
THIPayment_Foundational
0-1
THIPayment_Moderate
2 to 7
THIPL
THIPL_Complex
8 to 9
THIPL_Foundational
0-1
THIPL_Moderate
2 to 7
SPSC
SPSC_Foundational
0- 1
SPSC_Moderate
2 to 7
PLSCLegacy
PLSCLegacy_Complex
8 to 9
PLSCLegacy_Foundational
0- 1
PLSCLegacy_Moderate
2 to 7
PLSCPCIO
PLSCPCIO_Complex
8 to 9
PLSCPCIO_Foundational
0- 1
PLSCPCIO_Moderate
2 to 7
CREATE TABLE IEX_AGT_SKILL(
  MU_ID         NUMBER(5),
  AGENT_NM      VARCHAR2(30),
  EXTERNAL_ID   VARCHAR2(8),
  SKILL_NM      VARCHAR2(50))
CREATE TABLE CFG_PERSON_SKILL_VALUES(
  USER_ID       VARCHAR2(8),
  SKILL_NM      VARCHAR2(255),
  SKILL_LEVEL   NUMBER(10))
INSERT INTO IEX_AGT_SKILL(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(3,'ROBERTS,CHRIS','ROBERT1','THIPayment_FOUNDATIONAL')
INSERT INTO IEX_AGT_SKILL(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(3,'ROBERTS,CHRIS','ROBERT1','SPSC_FOUNDATIONAL')
INSERT INTO IEX_AGT_SKILL(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(7,'SEW,HEATHER','SEW1','SPSC_MODERATE')
INSERT INTO IEX_AGT_SKILL(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(7,'SEW,HEATHER','SEW1','SPSC_BOAT')
INSERT INTO IEX_AGT_SKILL(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(4,'PRATT,MIKE','PRATT2','THIPayment_COMPLEX')
INSERT INTO IEX_AGT_SKILL(MU_ID,AGENT_NM,EXTERNAL_ID,SKILL_NM)VALUES(4,'PRATT,MIKE','PRATT2','HELPDESK')
INSERT INTO CFG_PERSON_SKILL_VALUES(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('ROBERT1','THIPayment',1)
INSERT INTO CFG_PERSON_SKILL_VALUES(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('ROBERT1','SPSC',7)
INSERT INTO CFG_PERSON_SKILL_VALUES(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('SEW1','SPSC',1)
INSERT INTO CFG_PERSON_SKILL_VALUES(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('SEW1','SPSC_BOAT',1)
INSERT INTO CFG_PERSON_SKILL_VALUES(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('PRATT2','SPANISH',9)
INSERT INTO CFG_PERSON_SKILL_VALUES(USER_ID,SKILL_NM,SKILL_LEVEL)VALUES('PRATT2','HELPDESK',2)
DESIRED OUTCOME:
MU_ID AGENT_NM       EXTERNAL_ID    IEX_SKILL_NM                   GEN_SKILL_NM
3     ROBERTS,CHRIS  ROBERT1           SPSC_FOUNDATIONAL
3     ROBERTS,CHRIS  ROBERT1                                                            SPSC_MODERATE
7     SEW,HEATHER      SEW1                     SPSC_MODERATE
7     SEW,HEATHER      SEW1                                                                  SPSC_FOUNDATIONAL
4     PRATT,MIKE            PRATT2                   THIPayment_COMPLEX
4     PRATT,MIKE            PRATT2                                                              SPANISH