举个例子,如果有:中如何处理重复在SQL的UNION ALL SELECT语句
SELECT '[email protected]' AS Email, 2 AS Somenumber, 3 AS Number
UNION ALL
SELECT '[email protected]' AS Email, 2 AS Somenumber, 5 AS Number
UNION ALL
SELECT '[email protected]' AS Email, 1 AS Somenumber, 6 AS Number
代替:
我想:
我不明白这个问题。只是不要在“union all”中包含第一行。 –
假设这是样本数据,您如何决定要保留哪些“重复”,“number = 3”还是“number = 5”? – HoneyBadger
这一切都取决于电子邮件地址,我想只返回没有电子邮件重复的行 – Wicky