Postgres或排除運算符

Question

我有一個關於postgres的查詢，但是如果其中一個陳述是正確的，我不想應用另一個where陳述，例如我有這個查詢：

SELECT
DISTINCT ON (pa.id) id,
pa.family_id,
pel.item_id,
pel.parent_id,
pel.group_id,
pel.coverage_type,
pel.start_date,
pel.end_date,
pel.updated_at,
pel.updated_by
FROM
patient pa
JOIN patient_eligibility_list pel ON pel.parent_id = pa.id
AND ((now()BETWEEN pel.start_dateAND pel.end_date)
OR (now() > pel.start_date)
OR (now() > pel.end_date))
WHERE
pel.group_id = 1575
AND pel.start_date < pel.end_date
ORDER BY
pel.end_date DESC;

在where條件下，我需要一個運算符，如果第一個語句為true，則不驗證另一個語句

您推薦哪一個？

Answer 1

您應該嘗試明智地使用OR關鍵字。 您的查詢應如下所示

select * from abc where a = True or (b= False and c = True)

Answer 2

現在看到您想要的是Xor，而postgres則沒有，所以我更新了代碼以提供所需的結果。

SELECT
 DISTINCT ON (pa.id) id,
 pa.family_id,
 pel.item_id,
 pel.parent_id,
 pel.group_id,
 pel.coverage_type,
 pel.start_date,
 pel.end_date,
 pel.updated_at,
 pel.updated_by
FROM
 patient pa
JOIN patient_eligibility_list pel ON pel.parent_id = pa.id
 AND ((now()BETWEEN pel.start_dateAND pel.end_date)
 OR (now() > pel.start_date)
 OR (now() > pel.end_date))
WHERE
 (pel.group_id = 1575 and pel.start_date >= pel.end_date)
or
 (pel.group_id != 1575 and pel.start_date < pel.end_date)
ORDER BY
 pel.end_date DESC;