我正在努力获得客户的最后状态。通过浏览示例,我将这个查询放在一起工作:
SELECT table.Card,
table.Type,
table.Date,
ROW_NUMBER() OVER
(PARTITION by table.CARD ORDER BY table.date DESC, table.TYPE, table.DATE) rn
FROM table
WHERE table.Type = 'active' or table.Type = 'erased'
从那里,我只需要那些rn = 1的记录,但是一旦我尝试使用它作为子查询,如下所示,我得到一个syntaxis错误:
SELECT * FROM (
SELECT table.Card,
table.Type,
table.Date,
ROW_NUMBER() OVER
(PARTITION by table.CARD ORDER BY table.date DESC, table.TYPE, table.DATE) rn
FROM table
WHERE table.Type = 'active' or table.Type = 'erased'
) WHERE rn=1
这一定很简单,我只是想念,但我完全糊涂了。任何帮助将不胜感激。
答案 0 :(得分:2)
您应该为INNER选择指定别名。试试这个。
SELECT * FROM (
SELECT table.Card,
table.Type,
table.Date,
ROW_NUMBER() OVER
(PARTITION by table.CARD ORDER BY table.date DESC, table.TYPE, table.DATE) rn
FROM table
WHERE table.Type = 'active' or table.Type = 'erased'
) foo WHERE rn=1