create table n(f1 varchar(10),f2 float,f3 datetime)
insert into n values('A1', 1.00 , '2005-01-01')
insert into n values('A1', 1.00 , '2005-01-01')
insert into n values('A2', 2.00 , '2005-01-02')
insert into n values('A2', 2.00 , '2005-01-03')
insert into n values('A1', 3.00 , '2005-01-05')
insert into n values('A2', 3.00 , '2005-01-06')
select f3 ,a1=isnull((case f1 when 'a1' then sum(f2) end),0),a2=isnull((case f1 when 'a2' then sum(f2) end),0) from n group by f3,f1 order by f3
CREATE procedure CorssTab
@strTabName as varchar(50) = 'Employees', --此处放表名
@strCol as varchar(50) = 'City', --表头分组依据字段
@strGroup as varchar(50) = 'TitleOfCourtesy',--分组字段
@strNumber as varchar(50) = 'ReportsTo', --被统计的字段
@strSum as varchar(10) = 'Sum' --运算方式
AS
DECLARE @strSql as varchar(1000), @strTmpCol as varchar(100)
EXECUTE ('DECLARE corss_cursor CURSOR FOR SELECT DISTINCT ' + @strCol + ' from ' + @strTabName + ' for read only ') --生成游标
begin
SET nocount ON
SET @strsql ='select ' + @strGroup + ', ' + @strSum + '(' + @strNumber + ') AS [' + @strSum + ' of ' + @strNumber + ']' --查询的前半段
OPEN corss_cursor
while (0=0)
BEGIN
FETCH NEXT FROM corss_cursor --遍历游标,将列头信息放入变量@strTmpCol
INTO @strTmpCol
if (@@fetch_status<>0) break
SET @strsql = @strsql + ', ' + @strSum + '(CASE ' + @strCol + ' WHEN ''' + @strTmpCol + ''' THEN ' + @strNumber + ' ELSE Null END) AS [' + @strTmpCol + ' ' + @strCol + ']' --构造查询
END
SET @strsql = @strsql + ' from ' + @strTabname + ' group by ' + @strGroup --查询结尾
EXECUTE(@strsql) --执行
IF @@error <>0 RETURN @@error --如果出错,返回错误代码
CLOSE corss_cursor
DEALLOCATE corss_cursor RETURN 0 --释放游标,返回0表示成功