Question

我下面有一张桌子

DateRange
10/1
11/1
12/1

我正在使用游标遍历此表并尝试填充临时表

Create table #BidStatusCalculation1
(    
  Code nvarchar(max), 
  Data int  
)
Declare @monthStart varchar(20)   
DECLARE cur CURSOR FOR SELECT DateRange FROM @dateRange
OPEN cur
FETCH NEXT FROM cur INTO @monthStart
WHILE @@FETCH_STATUS = 0 BEGIN

Insert into #BidStatusCalculation1
    select 'SL Payroll',Count(*) from DashboardData
    where DataType = 'Bid'
    and CONVERT(NVARCHAR, CreatedDate, 105) = convert(datetime, 
                                             (@monthStart+'/'+@RequestYear))  

FETCH NEXT FROM cur INTO @monthStart
END
CLOSE cur    
DEALLOCATE cur

这给了我类似下面的结果

Code          Data
SL Payroll    22
SL Payroll    33
SL Payroll    43

我要修改表格，所以我只能得到一行

Code         Data1   Data2   Data3
SL Payroll   22       33      43

有人可以告诉我什么好方法是，在第一个循环上先将数据插入表中，然后再对其进行更新。我可以放入一个变量来计算循环迭代次数，然后编写单独的插入和更新操作，但我想知道是否有更好的方法。

谢谢

Answer 1

将 PIVOT 用作

SELECT Code,
       [22] Data1,
       [33] Data2,
       [43] Data3
FROM
    (
      SELECT *
      FROM T
    ) TBL
    PIVOT
    (
      MAX(Data) FOR Data IN([22],[33],[43])
    ) PVT

Demo

用于动态枢轴

CREATE TABLE T
(
  Code VARCHAR(45),
  Data INT
);

INSERT INTO T VALUES
('SL Payroll',    22),
('SL Payroll',    33),
('SL Payroll',    43);

DECLARE @IN VARCHAR(MAX) = '',
        @Cols VARCHAR(MAX) = '';

SELECT @IN = @IN + ',' + QUOTENAME(Data),
       @Cols = @Cols + ',' + QUOTENAME(Data) + ' AS Data'+
               CAST(ROW_NUMBER()OVER(ORDER BY (SELECT NULL)) AS VARCHAR)
FROM T;

SELECT @IN = STUFF(@IN, 1, 1, ''), @Cols = STUFF(@Cols, 1, 1, '');

DECLARE @SQL NVARCHAR(MAX) = N'SELECT Code, ' +
                               @Cols+
                               ' FROM (SELECT * FROM T) TBL PIVOT (MAX(Data) FOR Data IN('+
                               @IN+
                               ')) PVT';
     EXECUTE sp_executesql @SQL;

Demo

在SQL Server中的游标中插入和更新

1 个答案: