Question

我一直在尝试为以下查询创建一个支点：

select mainstate, customertypeid, count(1) as [counter] from customers group by customertypeid, mainstate

此查询应显示每个州的客户类型数量，它看起来像这样（按顺序排列并不重要）：

State|customertypeid|counter
  UT      3            200
  CA      3            500
  NY      3            300  
  UT      2            100
  CA      2            200
  NY      2            120
  UT      1             20
  CA      1             50
  NY      1             30

我尝试使用PIVOT如下（我确定我错了）：

SELECT *
FROM ( select mainstate, customertypeid, count(1) as [counter] from customers where customertypeid in (1,2,3) and mainstate != '' group by customertypeid, mainstate) as NonPivotedDataForReport2
PIVOT
(
COUNT([counter])
FOR mainstate IN ([# of Amb],[# Whole Sale Customers],[# Retail Customers])
) AS PivotedDataForReport2

我得到了这个：

customertypeid|type1|type2|type3
       1         0     0     0
       2         0     0     0
       3         0     0     0

并且报告应如下所示：

State|type1|type2|type3
UT     20    100   200
CA     50    200   500
NY     30    120   300

* Ps：我真的不想回到CASE + SUM语句，

非常感谢！

Answer 1

这样做：

SELECT  mainstate [State],
        [1] type1,
        [2] type2,
        [3] type3
FROM (  SELECT mainstate, customertypeid, COUNT(1) [counter] 
        FROM customers 
        WHERE customertypeid in (1,2,3) 
        AND mainstate != '' 
        GROUP BY customertypeid, mainstate) as NonPivotedDataForReport2
PIVOT(SUM([counter]) FOR customertypeid IN ([1],[2],[3])) AS PivotedDataReport2

Answer 2

这个（可能是稍微编辑过的）应该为你做的工作没有case / sum / pivot。创建临时表，插入起始数据，然后根据有多少客户类型ID动态添加列。

declare @s varchar(10), @xx1 varchar(500)

select distinct state into #temp from customers

DECLARE myCursor CURSOR FOR SELECT distinct customertypeid from customers
open MyCursor
FETCH NEXT FROM myCursor into @S
WHILE @@FETCH_STATUS = 0
    begin
        set @xx1 = 'alter table #temp add ['+@s+'] varchar(5)'
        execute sp_executesql @xx1
            set @xx1 = 'update a set a.['+@s+'] = coalesce(b.counter,0) from #temp a, customers b where b.customertypeid = '+@s+' and a.state = b.state'
            execute sp_executesql @xx1
        FETCH NEXT FROM myCursor into @S
    End
Close myCursor
DEALLOCATE myCursor

select * from #temp

通过查询在组上使用PIVOT

2 个答案: