Question

I want to query a table once as the time to query this table is about 8-12 mins and querying it twice is simply too long. There is a flag in the table for identifying internal vs external results. I want the sum of column A & Sum of B where this flag is internal and the sum of column B & C & D where this flag is external.. right now its two separate queries joined together…

This is an example of the first query

Select
CONVERT(varchar(10), right([week_name],10), 111) as DatePeriod --weekly
,[Group] as [Group]
,SUM([columnA]) as [columnA_int]
,SUM([columnB]) as [columnB_int]    
from  myTbl
where internal_external = 'internal' 
group by 
CONVERT(varchar(10), right([week_name],10), 111),[Group]

second query

Select
CONVERT(varchar(10), right([week_name],10), 111) as DatePeriod --weekly
,[Group] as [Group]
,SUM([columnB]) as [columnB_ext]
,SUM([columnC]) as [columnC_ext]
,SUM([columnC]) as [columnC_ext]        
from  myTbl
where internal_external = 'external' 
group by 
CONVERT(varchar(10), right([week_name],10), 111),[Group]

so ideally one query all 5 columns and only hit the DB up once.

Answer 1

Try it like this:

SELECT
    internal_external
    ,CONVERT(varchar(10), right([week_name],10), 111) as DatePeriod --weekly
    ,[Group] as [Group]
    ,SUM(CASE 
            WHEN internal_external='internal' THEN [columnA]
            ELSE 0 
          END) as [columnA_int]
    ,SUM([columnB]) as [columnB_intext] 
    ,SUM(CASE 
            WHEN internal_external='external' THEN [columnC]
            ELSE 0 
          END) as [columnC_ext]
    ,SUM(CASE 
            WHEN internal_external='external' THEN [columnC]
            ELSE 0 
          END) as [columnC_ext2]
FROM  myTbl
GROUP BY
    internal_external
    ,CONVERT(varchar(10), right([week_name],10), 111)
    ,[Group]
-- use the next lines if there are other values for internal_external
HAVING 
    internal_external IN('internal', 'external')

Or, if you want to forgo the internal_external column:

SELECT
    CONVERT(varchar(10), right([week_name],10), 111) as DatePeriod --weekly
    ,[Group] as [Group]
    ,SUM(CASE 
            WHEN internal_external='internal' THEN [columnA]
            ELSE 0 
          END) as [columnA_int]
    ,SUM(CASE 
            WHEN internal_external='internal' THEN [columnB]
            ELSE 0 
          END) as [columnB_int]
    ,SUM(CASE 
            WHEN internal_external='external' THEN [columnB]
            ELSE 0 
          END) as [columnB_ext]
    ,SUM(CASE 
            WHEN internal_external='external' THEN [columnC]
            ELSE 0 
          END) as [columnC_ext]
FROM  myTbl
GROUP BY
    internal_external
    ,CONVERT(varchar(10), right([week_name],10), 111)
    ,[Group]
-- use the next lines if there are other values for internal_external
HAVING 
    internal_external IN('internal', 'external')