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cross tab  data presentation

Posted on 2001-08-09
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Last Modified: 2006-11-17
how can i convert my access crosstab queries in sql server 7.0 because sql server not supports 'transform'
statment. please give some detail example how we can convert crosstab queries run in sql server or how
can we present a table data in crosstab format.
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Question by:sar1478
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acampoma earned 50 total points
ID: 6369522
try this stored proc:


create procedure sp_CrossTab
      @tablename                  varchar(255),      -- Table/View on which to perform the cross tab query.
      @crosscolumn            varchar(255),      -- Attribute to be used as columns in the cross tab.
      @crossrow                  varchar(255),      -- Attribute to be used as rows in the cross tab.
      @crossvalue                  varchar(255)      -- Attribute to be used as value in the cross tab.

As

-- Work variables
declare
      @sql                        varchar(8000),      -- Hold the dynamically created sql statement
      @colname                  varchar(255),      -- The current column when building sql statement
      @i                              smallint,            -- know when we reached the last column (@i = @cols)
      @cols                        smallint,            -- Number of columns
      @longest_col            smallint,            -- the len() of the widest column
      @CrLf                        char(2)
-- Constants
declare
      @max_cols_in_table      smallint,
      @max_col_name_len      smallint,
      @max_statement_len      smallint,
      @sql7                        bit,                  -- 1 when version 7, 0 otherwise.
      @err_severity            int

set nocount on

set @max_cols_in_table      = 255
set @max_statement_len      = 8000
set @max_col_name_len      = 128
set @err_severity            = 11
set @CrLf = char(13) + char(10)

-- Check inputs
if @tablename is null or @crosscolumn is null or @crossrow is null or @crossvalue is null begin
      raiserror ('Missing parameter(s)!',@err_severity,1)
      return 0
end

-- Check for existence of the table.
if (not exists(select * from sysobjects where name like @tablename))begin
      raiserror ('Table/View for crosstab not found!',@err_severity,1)
      return 0
end

-- Don't check for columns because we may actually get an expression as the column name

-- prepare for future feature of checking database version to validate
-- inputs. Default to version 7
set @sql7 = 1
if (patindex('%SQL Server  7.%',@@version) = 0) begin
      set @sql7 = 0
end

-- Extract all values from the rows of the attribute
-- we want to use to create the cross column. This table
-- will contain one row for each column in the crosstab.
create table #crosscol (crosscolumn varchar(255))
set @sql =      ' insert #crosscol Select Distinct ' + @crosscolumn +
                  ' From ' + @tablename --+
                  --' Group By ' + @crosscolumn
--print @sql
exec (@sql)
set @cols = @@rowcount

if @cols > @max_cols_in_table begin
      raiserror ('Exceeded maximum number of columns in Cross-tab',@err_severity,1)
      return 0
end
else begin
      if @cols = 0 begin
            raiserror ('Could not find values to use for columns in Cross-tab',@err_severity,1)
            return 0
      end
      else begin
            -- Check if any of the data is too long to make it a name of a column
            select @longest_col = max(len(convert(varchar(129),crosscolumn)))
            from #crosscol

            if @longest_col > @max_col_name_len begin
                  raiserror ('Value for column name exceeds legal length of column names',@err_severity,1)
                  return 0
            end
            else begin
                  
                  -- All Validations OK, start building the dynamic sql statement

                  set @sql = ''
                  -- Use tmp table rows to create the sql statement for the crosstab.
                  -- each row in the table will be a column in the cross-tab
                  set @sql = 'select isnull(convert(varchar(255), ' + @crossrow + '),''Undefined'') As '
                                    + @crossrow + ', ' + @CrLf + space(4)

                  --set @sql = 'select ' + @crossrow + ', ' + char(13)
                  
                  declare cross_sql cursor for
                  select crosscolumn
                  from #crosscol
                  order by crosscolumn

                  --print 'Sql cross statment: ' +  @sql

                  open cross_sql
                  fetch next from cross_sql into @colname
                  -- Use "@i" to check for the last column. We need to input commas
                  -- between columns, but not after the last column
                  set @i = 0
                  while @@FETCH_STATUS = 0 begin
                        set @i = @i + 1
                        set @colname = isnull(@colname,'Undefined')
                        set @crossvalue = isnull(@crossvalue, 0)

                        Set @sql = @sql  + '''' +  
                              convert(varchar(128), @colname) +
                              ''' = sum(case convert(varchar(128), ' + @crosscolumn + ')'
                                    + char(13) + char(10) + space(8) +
                                    ' when ''' + @colname + ''' then ' + @crossvalue + ' else 0 end) '

                        if @i < @cols
                              set @sql = @sql + ', ' + @CrLf + space(4)
                        else
                              set @sql = @sql + @CrLf

                        fetch next from cross_sql into @colname
                        end

                  close cross_sql
                  deallocate cross_sql

                  set @sql = @sql + ' from ' + @tablename + ' Group By ' + @crossrow
                  
                  if len(@sql) >= @max_statement_len begin
                        raiserror ('Crosstab sql statement cannot exceed 7999 characters',@err_severity,1)
                        return 0
                  end

                  exec (@sql)
                  Select 'Sql' =  @sql
                  set nocount off                  
                  return 1

            end
      end
end














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