SQL Graphical Queries Design
Query By Example
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Learning Objectives
• Create queries with graphical design in Access.
• List the main features of Query-By-Example (QBE).
• List the types of queries provided by the Microsoft
Access DBMS QBE facility.
• Use QBE to build queries to select fields and
records.
• Use QBE to target single or multiple tables.
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Query Design Opening
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Query Design
 Add tables
 Create joins
 Select fields
 Sort order
 Criteria
 Totals (aggregate operations)
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Adding Tables
Right mouse button: add a table
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Creating Joins
With the mouse create a join Ex :
[Stay1].[InstitutionID] and
[InstitutionID]
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Creating Joins
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Selecting Fields
Name of selected field
Name of the table
Check to display field
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Sort order, Criteria
Selection criteria
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Sort order
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Totals
Right mouse button:
Add one lign of work called totals
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Totals row
Group by
Totals choice: Group by
Drop down list of
totals
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Choice of total: Count
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Count and Where
Choice of total: Where
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Query-by-Example (QBE)
• Visual approach for accessing information in
a database through use of query templates.
• Example values are entered into template to
represent what access to database is to
achieve, such as the answer to a query.
• Originally developed by IBM in 1970s and has
proved so popular that QBE (or similar) is
now provided by most DBMSs.
• When user constructs a QBE - in background,
DBMS creates an equivalent SQL statement.
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Query-by-Example (QBE)
• Allows user to:
- Ask questions about data in one or more
tables.
- Specify the fields we want in the answer.
- Select records according to some criteria.
- Perform calculations on the data in tables.
- Insert and delete records.
- Modify values of fields.
- Create new fields
and tables.
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QBE in Microsoft Access
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Summary of Microsoft Access
Query Types
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Building Select Queries using
QBE - Specifying Criteria
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Building Select Queries using
QBE - Specifying Criteria
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Building Select Queries using
QBE - Specifying Criteria
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Creating Multi-table Queries
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Calculating Totals
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Calculating Totals
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Using Advanced Queries Parameter Query
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Using Advanced Queries Crosstab Query
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Using Advanced Queries Crosstab Query
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Using Advanced Queries - Find
Matched Query
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Using Advanced Queries - Find Unmatched Query
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Using Advanced Queries Autolookup Query
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Changing Content of Tables Make-Table Action Query
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Changing Content of Tables Delete Action Query
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Changing Content of Tables Update Action Query
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Changing Content of Tables Append Action Query
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Changing Content of Tables Append Action Query
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