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Greenplum - Architecture and SQL by Leona Coffing, Tom Coffing

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Chapter 11 – Aggregation

“Greenplum 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

AVG    Count    Count * 

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

image

SELECT      Avg(Grade_Pt)      AS "AVG"

,Count(Grade_Pt)   AS ...

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