我有3张桌子.团队,选项,OptionTeam.
团队拥有TeamId和Name
Option包含OptionId,OptionGroup
OptionTeam持有TeamId,OptionId,OptionGroup
团队拥有TeamId和Name
Option包含OptionId,OptionGroup
OptionTeam持有TeamId,OptionId,OptionGroup
select a.TeamId,a.Name (select count(*) from OptionTeam ot where ot.TeamId=a.TeamId and ot.OptionGroup=4) as Option1,(select count(*) from OptionTeam ot where ot.TeamId=a.TeamId and ot.OptionGroup=5) as Option2,(select count(*) from OptionTeam ot where ot.TeamId=a.TeamId and ot.OptionGroup=6) as Option3,(select count(*) from OptionTeam ot where ot.TeamId=a.TeamId and ot.OptionGroup=11) as Option4 from Team a
我想获得一个团队列表,以及额外的列,表明每个团队有多少个选项连接到每个团队.这是通过上面的查询完成的,但我想用表Option中的OptionGroup替换4,5,6,11的值.
它必须是动态的,因为将来可能会有一个新的OptionGroup,我希望存储过程能够处理它.
样本数据:
Team TeamId 1 2 3
选项
OptionId | OptionGroup 11 | 4 12 | 5 13 | 4 14 | 4 15 | 5
OptionTeam
TeamId | OptionId | OptionGroup 1 | 11 | 4 1 | 13 | 4 2 | 12 | 5 2 | 14 | 4 3 | 15 | 5
我想要的清单是
TeamId | Group4 (OptionGroup=4) | Group5 (OptionGroup=5) 1 | 2 | 0 2 | 1 | 1 3 | 0 | 1
解决方法
你需要一个动态的支点才能做到这一点.这是存储过程:
CREATE PROC [dbo].[pivotsp] @query AS NVARCHAR(MAX),-- The query,can also be the name of a table/view. @on_rows AS NVARCHAR(MAX),-- The columns that will be regular rows. @on_cols AS NVARCHAR(MAX),-- The columns that are to be pivoted. @agg_func AS NVARCHAR(257) = N'SUM',-- Aggregate function. @agg_col AS NVARCHAR(MAX),-- Column to aggregate. @output AS NVARCHAR(257) = N'',-- Table for results @debug AS bit = 0 -- 1 for debugging AS -- Example usage: -- exec pivotsp -- 'select * from vsaleshistory',-- 'market,marketid,family,familyid,Forecaster,Forecasterid,product,productid',-- 'month',-- 'sum',-- 'ku',-- '##sales' -- Input validation IF @query IS NULL OR @on_rows IS NULL OR @on_cols IS NULL OR @agg_func IS NULL OR @agg_col IS NULL BEGIN RAISERROR('Invalid input parameters.',16,1); RETURN; END -- Additional input validation goes here (sql Injection attempts,etc.) BEGIN TRY DECLARE @sql AS NVARCHAR(MAX),@cols AS NVARCHAR(MAX),@newline AS NVARCHAR(2); SET @newline = NCHAR(13) + NCHAR(10); -- If input is a valid table or view -- construct a SELECT statement against it IF COALESCE(OBJECT_ID(@query,N'U'),OBJECT_ID(@query,N'V')) IS NOT NULL SET @query = N'SELECT * FROM ' + @query; -- Make the query a derived table SET @query = N'(' + @query + N') AS Query'; -- Handle * input in @agg_col IF @agg_col = N'*' SET @agg_col = N'1'; -- Construct column list SET @sql = N'SET @result = ' + @newline + N' STUFF(' + @newline + N' (SELECT N'','' + quotename( ' + 'CAST(pivot_col AS sysname)' + + ') AS [text()]' + @newline + N' FROM (SELECT DISTINCT(' + @on_cols + N') AS pivot_col' + @newline + N' FROM' + @query + N') AS DistinctCols' + @newline + N' ORDER BY pivot_col' + @newline + N' FOR XML PATH(''''))' + @newline + N',1,N'''');' IF @debug = 1 PRINT @sql EXEC sp_executesql @stmt = @sql,@params = N'@result AS NVARCHAR(MAX) OUTPUT',@result = @cols OUTPUT; IF @debug = 1 PRINT @cols -- Create the PIVOT query IF @output = N'' begin SET @sql = N'SELECT *' + @newline + N'FROM (SELECT ' + @on_rows + N',' + @on_cols + N' AS pivot_col' + N',' + @agg_col + N' AS agg_col' + @newline + N' FROM ' + @query + N')' + + N' AS PivotInput' + @newline + N' PIVOT(' + @agg_func + N'(agg_col)' + @newline + N' FOR pivot_col IN(' + @cols + N')) AS PivotOutput;' end ELSE begin set @sql = 'IF EXISTS (SELECT * FROM tempdb.sys.objects WHERE ' + 'name = ''' + @output + ''' AND type = N''U'') DROP TABLE tempdb.' + @output EXEC sp_executesql @sql; SET @sql = N'SELECT * INTO ' + @output + @newline + N'FROM (SELECT ' + @on_rows + N',' + @agg_col + N' AS agg_col' + @newline + N' FROM ' + @query + N')' + + N' AS PivotInput' + @newline + N' PIVOT(' + @agg_func + N'(agg_col)' + @newline + N' FOR pivot_col IN(' + @cols + N')) AS PivotOutput;' end IF @debug = 1 PRINT @sql EXEC sp_executesql @sql; END TRY BEGIN CATCH DECLARE @error_message AS NVARCHAR(2047),@error_severity AS INT,@error_state AS INT; SET @error_message = ERROR_MESSAGE(); SET @error_severity = ERROR_SEVERITY(); SET @error_state = ERROR_STATE(); RAISERROR(@error_message,@error_severity,@error_state); RETURN; END CATCH
有了这个,很容易在可变数量的列上进行转换:
EXEC pivotsp 'SELECT TeamID,OptionGroup,OptionID AS Options FROM OptionTeam','Teamid',-- Row headers 'optiongroup',-- item to aggregate 'count',-- aggregation function 'optiongroup',-- Column header '##temp' -- output table name SELECT * FROM ##temp
结果:
Teamid 4 5 1 2 0 2 1 1 3 0 1