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如何使用NVL在此代碼的輸出中用零替換空值?我需要的零對這兩列,所以我可以執行除了Oracle:如何將NVL合併到此完整加入?
horse_wins + jockey_wins
目前,他們總是合計爲空,如果僅僅是一個值是零。我已經讀過NVL可以在這種情況下提供幫助,但實施起來很困難。
select
race_id,
horse_id,
horse_wins,
jockey_id,
jockey_wins,
horse_wins + jockey_wins
from
proj_entry a
FULL JOIN
tot_h_wins b
ON
a.horse_id = b.horse
FULL JOIN
tot_j_wins c
ON
a.jockey_id = c.jockey
where
race_id = 1
and
where
nvl(jockey_wins, 0);