Add a summary row with totals

Question

I know this sounds crazy and probably should not be done this way but I need something like this - I have a records from SELECT [Type], [Total Sales] From Before

I want to add an extra row at the end to show the SUM at the end of the table (After). Could this be done?

Solution 1

If you are on SQL Server 2008 or later version, you can use the ROLLUP() GROUP BY function:

SELECT
  Type = ISNULL(Type, 'Total'),
  TotalSales = SUM(TotalSales)
FROM atable
GROUP BY ROLLUP(Type)
;

This assumes that the Type column cannot have NULLs and so the NULL in this query would indicate the rollup row, the one with the grand total. However, if the Type column can have NULLs of its own, the more proper type of accounting for the total row would be like in @Declan_K's answer, i.e. using the GROUPING() function:

SELECT
  Type = CASE GROUPING(Type) WHEN 1 THEN 'Total' ELSE Type END,
  TotalSales = SUM(TotalSales)
FROM atable
GROUP BY ROLLUP(Type)
;

Solution 2

This is the more powerful grouping / rollup syntax you'll want to use in SQL Server 2008+. Always useful to specify the version you're using so we don't have to guess.

SELECT 
  [Type] = COALESCE([Type], 'Total'), 
  [Total Sales] = SUM([Total Sales])
FROM dbo.Before
GROUP BY GROUPING SETS(([Type]),());

Craig Freedman wrote a great blog post introducing GROUPING SETS.

Solution 3

Try to use union all as below

SELECT [Type], [Total Sales] From Before
union all
SELECT 'Total', Sum([Total Sales]) From Before

if you have problem with ordering, as i-one suggested try this:

select [Type], [Total Sales] 
from (SELECT [Type], [Total Sales], 0 [Key] 
      From Before 
      union all 
      SELECT 'Total', Sum([Total Sales]), 1 From Before) sq 
order by [Key], Type

Solution 4

You could use the ROLLUP operator

SELECT  CASE 
            WHEN (GROUPING([Type]) = 1) THEN 'Total'
            ELSE [Type] END AS [TYPE]
        ,SUM([Total Sales]) as Total_Sales
From    Before
GROUP BY
        [Type] WITH ROLLUP

Solution 5

If you want to display more column values without an aggregation function use GROUPING SETS instead of ROLLUP:

SELECT
  Type = ISNULL(Type, 'Total'),
  SomeIntColumn = ISNULL(SomeIntColumn, 0),
  TotalSales = SUM(TotalSales)
FROM atable
GROUP BY GROUPING SETS ((Type, SomeIntColumn ), ())
ORDER BY SomeIntColumn --Displays summary row as the first row in query result

View more solutions

Comments

[Sparky]

Minor note here, if values of Type are alphabetical after the word (U,V,W,etc. ) Total, then Total line might not appear on the bottom row...

[i-one]

I agree with @Sparky, this way it should be e.g. select [Type], [Total Sales] from (SELECT [Type], [Total Sales], 0 [Key] From Before union all SELECT 'Total', Sum([Total Sales]), 1 From Before) sq order by [Key], Type

[Sparky]

Without knowing the possible values of [Type], Cast() to VarChar(5) won't really address it. i-one shows the right solution, added a numeric counter to force the sort order...

[Adir D]

Another note: the UNION ALL variants of this will require two scans instead of one.

[Sohel Pathan]

I liked this solution. If you want to query and retrieve results from more than two columns then this is the good solution.

[Allen]

Updated link to Craig Freedman's blog post: docs.microsoft.com/en-us/archive/blogs/craigfr/…

[Adir D]

@Allen Thanks, wouldn't it be great if Microsoft could figure out how to move content without breaking existing links