Getting invalid identifier even though column exists - sql

Question

create table test_tab1(
seq_id NUMBER(10),
e_id NUMBER(10),
jira_key VARCHAR2(20),
stage_code NUMBER(10)
);
INSERT INTO test_tab1 VALUES(1,11,'JIRA_A',2);
INSERT INTO test_tab1 VALUES(2,12,'JIRA_B',3);
COMMIT;
create table test_tab2(
seq_id NUMBER(10),
e_id NUMBER(10),
jira_key VARCHAR2(20),
stage_code NUMBER(10)
);
Can anyone tell me why I am getting the n.stage_code invalid identifier error in the below code even though this column exists?
Expected should be that this query should not give this error since this column exist in the WITH sub query clause.
WITH got_new_code AS
(
SELECT m.e_id,m.jira_key
, m.stage_code AS new_code
, c.code
FROM test_tab1 m
CROSS APPLY (
SELECT LEVEL - 1 AS code
FROM dual
CONNECT BY LEVEL <= m.stage_code + 1
) c
WHERE m.stage_code IS NOT NULL
ORDER BY m.e_id,m.stage_code
)
SELECT *
FROM got_new_code n
FULL JOIN test_tab2 t USING (e_id,jira_key,stage_code);
Database version: Oracle 18c.

Answer 1

You have a USING clause which specifies stage_code as a column to join the left and right tables on and there is no stage_code from the got_new_code sub-query factoring clause as it has been aliased to new_code.
Either don't use USING and specify the join conditions manually or ensure that both sides of the join have all the columns in the USING clause:
WITH got_new_code (e_id, jira_key, new_code, code) AS (
SELECT m.e_id,m.jira_key
, m.stage_code
, c.code
FROM test_tab1 m
CROSS APPLY (
SELECT LEVEL - 1 AS code
FROM dual
CONNECT BY LEVEL <= m.stage_code + 1
) c
WHERE m.stage_code IS NOT NULL
ORDER BY m.e_id,m.stage_code
)
SELECT *
FROM got_new_code n
FULL JOIN test_tab2 t
ON ( t.e_id = n.e_id
AND t.jira_key = n.jira_key
AND t.stage_code = n.new_code );
or
WITH got_new_code (e_id, jira_key, stage_code, code) AS (
SELECT m.e_id,m.jira_key
, m.stage_code
, c.code
FROM test_tab1 m
CROSS APPLY (
SELECT LEVEL - 1 AS code
FROM dual
CONNECT BY LEVEL <= m.stage_code + 1
) c
WHERE m.stage_code IS NOT NULL
ORDER BY m.e_id,m.stage_code
)
SELECT *
FROM got_new_code n
FULL JOIN test_tab2 t USING (e_id,jira_key,stage_code);
db<>fiddle here

Answer 2

You can either remove the new_code alias:
WITH got_new_code AS
(
SELECT m.e_id,m.jira_key
, m.stage_code
, c.code
FROM test_tab1 m
CROSS APPLY (
SELECT LEVEL - 1 AS code
FROM dual
CONNECT BY LEVEL <= m.stage_code + 1
) c
WHERE m.stage_code IS NOT NULL
ORDER BY m.e_id,m.stage_code
)
SELECT *
FROM got_new_code n
FULL JOIN test_tab2 t USING (e_id,jira_key,stage_code);
or change the join from using to on:
WITH got_new_code AS
(
SELECT m.e_id,m.jira_key
, m.stage_code AS new_code
, c.code
FROM test_tab1 m
CROSS APPLY (
SELECT LEVEL - 1 AS code
FROM dual
CONNECT BY LEVEL <= m.stage_code + 1
) c
WHERE m.stage_code IS NOT NULL
ORDER BY m.e_id,m.stage_code
)
SELECT *
FROM got_new_code n
FULL JOIN test_tab2 t
ON t.e_id = n.e_id AND t.jira_key = n.jira_key AND t.stage_code = n.new_code;
... which gives the joining columns twice; so you probably want to coalesce those back to a single occurrence.
db<>fiddle