Fast and Furious: Discovering Windowing Function
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The document discusses windowing functions in SQL Server, detailing various types such as aggregate, ranking, offset, and distribution functions. It highlights their applications including data paging, de-duplication, and calculating statistics like running totals and percentiles. The content also includes demos and a Q&A section for further clarification.
Fast and Furious: Discovering Windowing Function
- 1. Fast and Furious: Discovering Windowing Function Ahias Portillo Portillo.ahias@Outlook.com MVP, MCITP en Sql Server DPA, SolidQ
- 2. Agenda Introduction Aggregate Functions Ranking Functions Offset Functions Distribution Functions
- 3. What they can do WF?
- 4. What we DO?
- 5. We do things must not do
- 6. Window Functions (Fabiano Amorim, Window Functions in Sql Server)
- 7. What can I do? Paging De-duplicating data Returning top n rows per group Computing running totals Identifying gaps and islands Computing percentiles Computing the mode of the distribution You can imagine….
- 8. OVER
- 9. Aggregate Function AVG CHECKSUM_AGG COUNT COUNT_BIG MAX MIN SUM VAR VARP
- 10. DEMO
- 11. Ranking Functions ROW_NUMBER RANK DENSE_RANK NTILE
- 12. DEMO
- 13. Offset Functions LAG() LEAD() LAST_VALUE() FIRST_VALUE()
- 14. DEMO
- 15. Distribution Functions CUME_DIST() PERCENT_RANK() PERCENTILE_CONT() PERCENTILE_DISC()
- 16. DEMO
- 17. Q & A ?
Editor's Notes
- #10: AVG Calculates the average over the group. CHECKSUM_AGG Calculates the checksum over the group. This is often used to detect changes in the data. COUNT Used to get a count of the rows or a count of non-null values of a column. COUNT_BIG Works like COUNT, but returns a big integer. MAX Returns the highest value in the set. MIN Returns the lowest value in the set. STDEV Calculates the standard deviation over the group. STDEVP Calculates the standard deviation for the population over the group. SUM Adds up the values over the group. VAR Returns the statistical variance over the group. VARP Returns the statistical
- #16: PERCENT_RANK : Calculates the relative rank of a row within a group of rows in SQL Server 2016. Use PERCENT_RANK to evaluate the relative standing of a value within a query result set or partition. PERCENT_RANK is similar to the CUME_DIST function