join order step by step in oracle - oracle

Question

I have a trouble with below query.I want to join columns in step.
For example a.code first b.name1 if not match then join name2 etc.But i cant handle the query.
SELECT * FROM TABLE A
LEFT JOIN TABLE B
ON A.CODE = B.NAME1
OR A.CODE = B.NAME2
OR UPPER(B.NAME3) = UPPER(A.NAME)
Thanks
edit
with sample below,
if TABLEB.CODE = TABLEA.NAME1 match then dont want to look OR TABLEB.CODE = TABLEA.NAME2.
And if not matching any TABLEB.CODE = TABLEA.NAME1 then step by step match the columns on that order.
WITH TABLEA AS (SELECT 13445 AS ID,'A' AS TYPE,'DFSF' AS NAME1 , 'PCK' AS NAME2 FROM DUAL
UNION ALL
SELECT 13445 AS ID,'A' AS TYPE,'PCK' AS NAME1 , 'PCK' AS NAME2 FROM DUAL),
TABLEB AS (SELECT 56544 AS ID, 'PCK' AS CODE, 'PCK' AS FRST_NM FROM DUAL)
SELECT * FROM TABLEA
LEFT JOIN TABLEB
ON TABLEB.CODE = TABLEA.NAME1
OR TABLEB.CODE = TABLEA.NAME2
OR UPPER(TABLEB.FRST_NM) = UPPER(TABLEA.NAME2)

Answer 1

I believe your query will do what you want. There is no step by step in join conditions if you have already mentioned OR. So if either of the condition match, the rows will be matched. So if A.CODE <> B.NAME1 but A.CODE = B.NAME2, they will match. If both are true, then also they will match. I create a CTE with sample data to see the output. It will return 3 rows for 3 matches.
WITH TBL(SEQ,CODE,NAME,NAME1,NAME2,NAME3) AS
(
SELECT 1,'A1','B','A1','D','E' FROM DUAL UNION ALL -- as A.CODE(A1)=B.NAME1, it will match
SELECT 2, 'B2','B','D','B2','F' FROM DUAL UNION ALL --as A.CODE (B2) <> B.NAME1 , it will match for B.NAME2
SELECT 3, 'G','H1','D','A','H1' FROM DUAL UNION ALL --match for UPPER(B.NAME3) = UPPER(A.NAME)
SELECT 4,'P4','Q4','R4','S4','T4' FROM DUAL
)
SELECT * FROM TBL A
LEFT JOIN TBL B
ON (A.CODE = B.NAME1
OR A.CODE = B.NAME2
OR UPPER(B.NAME3) = UPPER(A.NAME)
)
Column SEQ is just to see what rows are returning.
Output
+-----+------+------+-------+-------+-------+-------+--------+--------+---------+---------+---------+
| SEQ | CODE | NAME | NAME1 | NAME2 | NAME3 | SEQ_1 | CODE_1 | NAME_1 | NAME1_1 | NAME2_1 | NAME3_1 |
+-----+------+------+-------+-------+-------+-------+--------+--------+---------+---------+---------+
| 1 | A1 | B | A1 | D | E | 1 | A1 | B | A1 | D | E |
| 2 | B2 | B | D | B2 | F | 2 | B2 | B | D | B2 | F |
| 3 | G | H1 | D | A | H1 | 3 | G | H1 | D | A | H1 |
| 4 | P4 | Q4 | R4 | S4 | T4 | | | | | | |
+-----+------+------+-------+-------+-------+-------+--------+--------+---------+---------+---------+