我们可以在group子句中使用相关子查询吗？

Question

我有一个表t2，其中字段Col＆a，b，c，d，e为记录。我正在尝试获得如下输出：

r1      0   1
1       b   a
2       d   c
4       e

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当我使用以下查询时出现错误：表达式中的语法错误（（（（从t2中选择Count（b.Col）+1为b，其中a.col> b.col）+1）\ 2 < / p>

Transform
first(col) as col1
Select  ((Select Count(b.Col)+1 from t2 as b where a.col>b.col)+1)\2 as r1
From t2 as a
Group  by (((Select Count(b.Col)+1 from t2 as b where a.col>b.col)+1)\2)
Pivot
(Select Count(b.Col)+1 from t2 as b where a.col>b.col) MOD 2

Answer 1

我不这么认为。只需使用子查询：

CefSharp (WPF)

或者，因为您仅选择不同的值，所以在原始查询中使用select r1 from (select a.*, (Select Count(b.Col)+1 from t2 as b where a.col>b.col)+1)\2 as r1 from t2 as a ) as a1 group by r1; 而不是select distinct。