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PIVOT example in sql server

Explanation :

create table DailyIncome(VendorId nvarchar(10), IncomeDay nvarchar(10), IncomeAmount int)
insert into DailyIncome values ('SPIKE', 'FRI', 100)
insert into DailyIncome values ('SPIKE', 'MON', 300)
insert into DailyIncome values ('FREDS', 'SUN', 400)
insert into DailyIncome values ('SPIKE', 'WED', 500)
insert into DailyIncome values ('SPIKE', 'TUE', 200)
insert into DailyIncome values ('JOHNS', 'WED', 900)
insert into DailyIncome values ('SPIKE', 'FRI', 100)
insert into DailyIncome values ('JOHNS', 'MON', 300)
insert into DailyIncome values ('SPIKE', 'SUN', 400)
insert into DailyIncome values ('JOHNS', 'FRI', 300)
insert into DailyIncome values ('FREDS', 'TUE', 500)
insert into DailyIncome values ('FREDS', 'TUE', 200)
insert into DailyIncome values ('SPIKE', 'MON', 900)
insert into DailyIncome values ('FREDS', 'FRI', 900)
insert into DailyIncome values ('FREDS', 'MON', 500)
insert into DailyIncome values ('JOHNS', 'SUN', 600)
insert into DailyIncome values ('SPIKE', 'FRI', 300)
insert into DailyIncome values ('SPIKE', 'WED', 500)
insert into DailyIncome values ('SPIKE', 'FRI', 300)
insert into DailyIncome values ('JOHNS', 'THU', 800)
insert into DailyIncome values ('JOHNS', 'SAT', 800)
insert into DailyIncome values ('SPIKE', 'TUE', 100)
insert into DailyIncome values ('SPIKE', 'THU', 300)
insert into DailyIncome values ('FREDS', 'WED', 500)
insert into DailyIncome values ('SPIKE', 'SAT', 100)
insert into DailyIncome values ('FREDS', 'SAT', 500)
insert into DailyIncome values ('FREDS', 'THU', 800)

insert into DailyIncome values ('JOHNS', 'TUE', 600)


Now, if we select out the flat data that we have, we will get the following:

VendorId   IncomeDay  IncomeAmount
---------- ---------- ------------
SPIKE      FRI        100
SPIKE      MON        300
FREDS      SUN        400
SPIKE      WED        500
SPIKE      TUE        200
JOHNS      WED        900
SPIKE      FRI        100
JOHNS      MON        300
SPIKE      SUN        400
...
SPIKE      WED        500
FREDS      THU        800
JOHNS      TUE        600

select * from DailyIncome
pivot (avg (IncomeAmount) for IncomeDay in ([MON],[TUE],[WED],[THU],[FRI],[SAT],[SUN])) as AvgIncomePerDay

VendorId   MON         TUE         WED         THU         FRI         SAT         SUN
---------- ----------- ----------- ----------- ----------- ----------- ----------- -----------
FREDS      500         350         500         800         900         500         400
JOHNS      300         600         900         800         300         800         600
SPIKE      600         150         500         300         200         100         400


select * from DailyIncome
pivot (max (IncomeAmount) for IncomeDay in ([MON],[TUE],[WED],[THU],[FRI],[SAT],[SUN])) as MaxIncomePerDay
where VendorId in ('SPIKE')

VendorId   MON         TUE         WED         THU         FRI         SAT         SUN
---------- ----------- ----------- ----------- ----------- ----------- ----------- -----------
SPIKE      900         200         500         300         300         100         400

The short story on how it works using the last query.

select * from DailyIncome                                 -- Colums to pivot
pivot (
   max (IncomeAmount)                                                    -- Pivot on this column
   for IncomeDay in ([MON],[TUE],[WED],[THU],[FRI],[SAT],[SUN]))         -- Make colum where IncomeDay is in one of these.
   as MaxIncomePerDay                                                     -- Pivot table alias
where VendorId in ('SPIKE')                               -- Select only for this vendor



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