1. WINDOW FUNCTIONS ARE YOUR FRIENDS Dejan Dular @dejandular
Dejan Dular
SQL Grillen, Lingen, 2017

2. Dejan Dular s.p. Dejan Dular Dejan Dular Dejan Dular Developer CEO CFO
.NET Developer
SQL Developer
Dynamics CRM specialist
Dejan Dular
CEO
Dejan Dular
CFO

3. SUM(quantity) OVER (<this set of rows>)
Betsy

4. SUM(quantity) OVER (<partition> <order> <frame>)
Betsy

5. SELECT S.TerritoryID, P.FirstName, P.LastName, S.SalesYTD,
ROW_NUMBER() OVER (PARTITION BY S.TerritoryId ORDER BY S.SalesYTD)
FROM Sales.SalesPerson S
JOIN Person.Person P ON S.BusinessEntityID = P.BusinessEntityID
ORDER
TerritoryID
FirstName
LastName
SalesYTD
Row Number 1
Pamela
Ansman-Wolfe
,13
David
Campbell
,94 2
Tete
Mensa-Annan
,20 3
Michael
Blythe
,18
Jillian
Carson
,37 4
Shu
Ito
,62
Linda
Mitchell
,55
PARTITION
Buttercup

6. Available functions Ranking: ROW_NUMBER, RANK, DENSE_RANK, NTILE
Magic castle

7. Available functions Ranking: ROW_NUMBER, RANK, DENSE_RANK, NTILE
Aggregates:
SUM, AVG, MIN, MAX, COUNT, COUNT_BIG, STDEV, STDEVP, VAR, VARP
Magic castle

8. Available functions Ranking: ROW_NUMBER, RANK, DENSE_RANK, NTILE
Aggregates:
SUM, AVG, MIN, MAX, COUNT, COUNT_BIG, STDEV, STDEVP, VAR, VARP
Analytic:
FIRST_VALUE, LAST_VALUE, LAG, LEAD, PERCENT_RANK, CUME_DIST,
PERCENTILE_CONT, PERCENTILE_DIST
Magic castle

9. FRAMING Sarka Year Month Sales 2016 1 1.352.577,13 2 1.573.012,94 3
,20 4
,18 5
,37 6
,62 7
,55
Sarka

10. FRAMING ROWS (Physical operator) n PRECEEDING n FOLLLOWING
UNBOUNDED PRECEEDING
UNBOUNDED FOLLOWING
CURRENT ROW

11. 1 2 3 4 5 6 7 8 9 10 ROWS CURRENT ROW UNBOUNDED PRECEEDING
UNBOUNDED PRECEEDING
UNBOUNDED FOLLOWING
2 PRECEEDING
3 FOLLOWING
1 FOLLOWING
UNBOUNDED FOLLOWING
Rob

12. FRAMING ROWS (Physical operator) n PRECEEDING n FOLLLOWING
UNBOUNDED PRECEEDING
UNBOUNDED FOLLOWING
CURRENT ROW
RANGE (Logical operator)
CURRENT ROW (what is current row?)

13. RANGE
CURRENT ROW
ROW
DATA
UNBOUNDED PRECEEDING
UNBOUNDED FOLLOWING
Charlie

14. Martha the Unicorn says:
Always define the window range
to prevent invisible bugs in your queries

15. Performance LEAF INDEX
SELECT SUM(Sales) OVER (PARTITION BY Year ORDER BY Month ROWS UNBOUNDED PRECEDING)
LEAF
INDEX
Lightning

16. Using window functions like a boss!
German sausage is the Wurst
BUT!
Austrian schnitzel is the Wiener!
Using window functions like a boss!