Question

是否可以这样做：

SELECT * FROM public."LamcApiCalls" WHERE generalstatuscode=0 AND sendondate < NOW() AND push = 1
UNION ALL
SELECT * FROM public."LamcApiCalls" WHERE generalstatuscode=0 AND sendondate < NOW() AND push IS NULL ORDER BY random() LIMIT 50

由于第二个查询上的ORDER BY和LIMIT而失败。反正有这样做吗？

谢谢

Answer 1

您可以将第二个查询放入子查询中：

SELECT * FROM public."LamcApiCalls" WHERE generalstatuscode=0 AND sendondate < NOW() AND push = 1

UNION ALL

SELECT 
    * 
FROM (
    SELECT * FROM public."LamcApiCalls" WHERE generalstatuscode=0 AND sendondate < NOW() AND push IS NULL ORDER BY random() LIMIT 50
) s

具有ORDER BY和LIMIT的Postgres UNION

1 个答案: