Computer Science & Engineering 2111
Inner Joins and Advanced Queries
CSE 2111 Lecture-Advanced Queries
1
Sorting Results in a Query
Use the Sorting line - Ascending or Descending to sort the
resulting Query Table


To sort multiple fields
– The computer will apply sort precedence for sorting
fields listed on a query from left to right.
Sorting can be combined with any of the filtering
techniques (criteria) we have already discussed.
2
CSE 2111 Lecture-Advanced Queries
Write a query to list the Last name and First name of all clients. The list
should be sorted in ascending order by Last name, and then by First
name..
Query Name:
NameSort
Tables Required:
Client
Foreign Keys:
None
Join Type:
None
Field
LName
FName
Table
Client
Client
Sort
Ascending
Ascending
Show
x
x
Major
Sort
Minor
Sort
Criteria
OR
OR
CSE 2111 Lecture-Advanced Queries
3
The data table
The resulting dynaset
4
CSE 2111 Lecture-Advanced Queries
Write a query to list the city and state of all clients The list should be
sorted in ascending order by State and then by City.
Query Name:
CityStateSort
Tables Required:
Client
Foreign Keys:
None
Join Type:
None
Field
City
State
Table
Client
Client
Ascending
Sort
Show
City
x
Ascending
x
Criteria
OR
OR
Major
Sort
CSE 2111 Lecture-Advanced Queries
Minor
Sort
5
The data table
The resulting dynaset
6
CSE 2111 Lecture-Advanced Queries
Query Name: InnerJoinExample
Tables Required:
Client/Payments
Foreign Keys: ClientID
Join Type:
Inner
Field
ClientID
Table
Client
LastName
Amount
Client
Payments
Sort
Show
x
x
x
Criteria
OR
OR
CSE 2111 Lecture-Inner Joins in Queries
7
The data tables
The resulting dynaset
Dynaset only includes records that have
matching keys on both tables. This is
called an inner join which is the default
join type in Access
CSE 2111 Lecture-Inner Joins in Queries
8
Guidelines when using more than one table in a query
• Only show the tables on the grid that will be used in your query.
Adding extra tables to the QBE grid may cause the dynaset to
display incorrectly.
• All tables shown in the query must either be directly or
indirectly linked in order for the query to run correctly. Usually
this is the case, but there are some scenarios where you will
have to create the relationship on the QBE grid yourself.
CSE 2111 Lecture-Inner Joins in Queries
9
Write a query that lists the first name,
last name, and payment method for
each payment made by the client.
Query Name:
PaymentMethod
Tables Required:
Client/Payments/PaymentMethod
Foreign Keys:
ClientID/PaymentType
Join Type:
Inner
Field
First Name Last Name
MethodType
Table
Total
Sort
Client
Payments
Show
Criteria
OR
x
Client
x
x
CSE 2111 Lecture-Aggregate Fields in
Queries
10
The data tables
The resulting dynaset
CSE 2111 Lecture-Aggregate Fields in
Queries
11
What if we want to create a field in a query that is the result of a calculation?
You have decided to give all clients a 10% break on each charge they have
made. Write a query to list the ClientID, each charge amount before the
discount, the discount, and the charge amount after the discount .
Query Name:
DiscountCharges
Tables Required:
Client/Charges
Foreign Keys:
ClientID
Join Type:
Inner
Field
ClientID
Amount
Table
Client
Charges
Discount: [Amount] * 0.10
New Charge: [Amount] – [Discount]
Sort
Show
x
x
x
x
Criteria
OR
OR
CSE 2111 Lecture-Calculated Fields in
Queries
12
The resulting dynaset
Notice new field names
13
CSE 2111 Lecture-Calculated Fields in
Queries
To Aggregate fields in a Query use the Group by feature
Group by
Use the Group by feature to summarize a field –
calculating its average, min, max, sum etc.
 Select the group(s) you wish to aggregate Access will automatically group by the lowest
detail level field.
 In the desired field(s) select the function (sum,
average, etc) using the pull down menu
Sum
Avg
Min
Max
Count
StDev
Var
First
Last
Expression
Where
CSE 2111 Lecture-Aggregate Fields in
Queries
14
Query design grid's Total Row options:
Group By: Define the groups you want to perform the
calculations for.
Aggregate Functions: Sum, Avg, Min, Max etc.
Where: Specify criteria for a field, so only those records that
meet this criteria will be included in the aggregates.
Expression:
Use if a calculated field is required in the query.
Expressions will be calculated AFTER the fields are aggregated.
15
CSE 2111 Lecture-Aggregate Fields in
Queries
Write a query that lists how many
payments were made by each Client and
their total payments. List the First Name,
Last Name, the number of payments
made, and the total dollar amount of
these payments.
Query Name:
PaymentSummary
Foreign Keys:
ClientID
First Name Last Name
Field
Table
Total
Sort
Show
Criteria
OR
OR
Tables Required:
Join Type:
ClientID
Amount
Client
Client
Payments
Payments
Group by
Group by
Count
Sum
x
x
x
CSE 2111 Lecture-Aggregate Fields in
Queries
Client/Payments
Inner
x
16
The data tables
The resulting dynaset
Notice new field names
17
CSE 2111 Lecture-Aggregate Fields in
Queries
Write a query to summarize by Client, all
of the charges made after 5/1/2008. Add
a surcharge of 20% to these charges. List
the First Name, Last Name, Original
Charge and New Charge.
Query Name:
ChargesSummary
Foreign Keys:
Field
First
Name
ClientID
Last
Name
Join Type:
Amount ChargeDate
Table
Client
Total
Group by Group by Sum
Client
Tables Required:
Charges
Client/Charges
Inner
New Charge: [SumOfAmount] * 1.20
Charges
Where
Expression
Sort
Show
Criteria
x
x
x
x
> #5/1/2008#
OR
OR
CSE 2111 Lecture-Aggregate Fields in
Queries
18
The data tables
Notice new field names
The resulting dynaset
19
CSE 2111 Lecture-Aggregate Fields in
Queries