Il motivo per cui hai ricevuto un errore sulla tua query è che prima che la sottoquery sia definita, devi indicare cosa vuoi selezionare da essa. Quindi, se l'avevi anteposto con select * from sarebbe stata una query valida.
Nota che non devi fare quei or operazioni, poiché puoi farlo in modo più breve con un in operatore.
Dovresti anche annullare alcuni confronti (dato che hai già NOT ) e troncare le date con TRUNC .
Ecco la query che suggerirei:
SELECT TEMP.REG_ID,
TEMP.EVENT_TYPE,
TEMP.EVENT_DATE,
TEMP.PRODUCT_CD,
TEMP.TERM_START_DATE,
CASE WHEN TEMP.EVENT_TYPE IN ('NEW SUBSCRIPTION', 'RENEWAL', 'UPSELL')
AND TEMP.NEXT_EVENT_TYPE = 'CANCELLATION' THEN
LEAST(TEMP.TERM_END_DATE, TEMP.NEXT_TERM_END_DATE)
ELSE TEMP.TERM_END_DATE
END AS TERM_END_DATE,
TEMP.DAYS,
TEMP.AMT
FROM (SELECT REG_ID,
EVENT_TYPE,
EVENT_DATE,
PRODUCT_CD,
TERM_START_DATE,
TERM_END_DATE,
DAYS,
AMT,
LAG(EVENT_TYPE, 1, '-') over (
PARTITION BY REG_ID, PRODUCT_CD
ORDER BY EVENT_DATE, TERM_START_DATE) as PREV_EVENT_TYPE,
LAG(EVENT_DATE, 1) over (
PARTITION BY REG_ID, PRODUCT_CD
ORDER BY EVENT_DATE, TERM_START_DATE) as PREV_EVENT_DATE,
LEAD(EVENT_TYPE, 1, '-') over (
PARTITION BY REG_ID, PRODUCT_CD
ORDER BY EVENT_DATE, TERM_START_DATE) as NEXT_EVENT_TYPE,
LEAD(EVENT_DATE, 1) over (
PARTITION BY REG_ID, PRODUCT_CD
ORDER BY EVENT_DATE, TERM_START_DATE) as NEXT_EVENT_DATE,
LEAD(TERM_END_DATE, 1) over (
PARTITION BY REG_ID, PRODUCT_CD
ORDER BY EVENT_DATE, TERM_START_DATE) as NEXT_TERM_END_DATE
FROM export_table) TEMP
WHERE NOT (TEMP.EVENT_TYPE = 'CANCELLATION'
AND TEMP.PREV_EVENT_TYPE IN ('NEW SUBSCRIPTION', 'RENEWAL', 'UPSELL')
AND TRUNC(TEMP.EVENT_DATE) = TRUNC(TEMP.PREV_EVENT_DATE))
AND NOT (TEMP.NEXT_EVENT_TYPE = 'CANCELLATION'
AND TEMP.EVENT_TYPE IN ('NEW SUBSCRIPTION', 'RENEWAL', 'UPSELL')
AND TRUNC(TEMP.NEXT_EVENT_DATE) = TRUNC(TEMP.EVENT_DATE))
Nota che il term_end_date del record 6 viene modificato anche, in quanto ad esso si applica la regola 2.
