Aggregating Data

Presented by Aaron Buma

AgendaCOUNT(), SUM(), MIN(), MAX(), AVG()

Accounting for NULLsGrouping on multiple fieldsOrdering Results

HAVING – Filtering on Aggregate fieldsFiltering on Aggregate and non-aggregate

fieldsDISTINCT

COUNT(), SUM(), MIN(), MAX(), AVG()function(expression) – Expressions generally column

nameCOUNT(x) – number of matching records, can be *, 1,

columnSUM(x) – summation of expression or column per groupMIN(x) – minimum of expression value per groupMAX(x) – maximum of expression value per groupAVG(x) – average of expression value per group

Aggregation DetailsAccounting for NULLsGrouping on Multiple FieldsORDER BY on Aggregate Fields

HAVING - Filtering on Aggregate FieldsThe ‘HAVING’ clauseIncluding non-Aggregate field in filtering

DISTINCT - Filtering on Aggregate FieldsThe ‘DISTINCT’ clause

How to include with COUNT(), MIN(), MAX(), AVG()Does it account for NULLS?

Question 1

SELECT DateRecorded,VoteID,COUNT(User) AS [Count]

FROM VoterTable GROUP BY DateRecord,

VoteID;

Question 2Total Cost of inventory on hand?

Question 2

Any Questions?COUNT(), SUM(), MIN(), MAX(), AVG()

Accounting for NULLsGrouping on multiple fieldsOrdering Results

HAVING – Filtering on Aggregate fieldsFiltering on Aggregate and non-aggregate

fieldsDISTINCT