Training on Aggregation Data for the SQL Server Queries Certification course. 70-461

1. Presented by Aaron Buma

2. Agenda
 COUNT(), SUM(), MIN(), MAX(), AVG()
 Accounting for NULLs
 Grouping on multiple fields
 Ordering Results
 HAVING – Filtering on Aggregate fields
 Filtering on Aggregate and non-aggregate fields
 DISTINCT

3. COUNT(), SUM(), MIN(), MAX(), AVG()
 function(expression) – Expressions generally column name
 COUNT(x) – number of matching records, can be *, 1,
column
 SUM(x) – summation of expression or column per group
 MIN(x) – minimum of expression value per group
 MAX(x) – maximum of expression value per group
 AVG(x) – average of expression value per group

4. Aggregation Details
 Accounting for NULLs
 Grouping on Multiple Fields
 ORDER BY on Aggregate Fields

5. HAVING - Filtering on Aggregate Fields
 The ‘HAVING’ clause
 Including non-Aggregate field in filtering

6. DISTINCT - Filtering on Aggregate Fields
 The ‘DISTINCT’ clause
 How to include with COUNT(), MIN(), MAX(), AVG()
 Does it account for NULLS?

7. Question 1

8. SELECT DateRecorded,
VoteID,
COUNT(User) AS [Count]
FROM VoterTable
GROUP BY DateRecord,
VoteID;

9. Question 2
 Total Cost of inventory on hand?

10. Question 2

11. Any Questions?
 COUNT(), SUM(), MIN(), MAX(), AVG()
 Accounting for NULLs
 Grouping on multiple fields
 Ordering Results
 HAVING – Filtering on Aggregate fields
 Filtering on Aggregate and non-aggregate fields
 DISTINCT