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Microsoft Azure SQL Data Warehouse - Architecture and SQL by Todd Wilson, Tom Coffing

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Chapter 9 – Aggregation

“The Azure SQL Data Warehouse climbed Aggregate Mountain and delivered a better way to Sum It.”

– Tera-Tom Coffing

Quiz – You calculate the Answer Set in your own Mind

image

SELECT   Avg(Grade_Pt)    AS "AVG"
  ,Count(Grade_Pt)  AS "Count"
  ,Count(*)AS "Count *"
FROM Student_Table
WHERE Class_Code IS NULL

image

What would the result set be from the above query? The next slide shows answers!

Answer – You calculate the Answer Set in your own Mind

SELECT   Avg(Grade_Pt)    AS "AVG"
  ,Count(Grade_Pt)  AS "Count"

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