chapter07 qbe examples

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Chapter 7 - Database Principles

Query-by-Example


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Chapter 7 - Objectives

x The main features of Query-By-Example (QBE).

x The types of queries provided by the Microsoft

Access DBMS QBE facility.

x How to use QBE to build queries to select fields

and records.

x How to use QBE to target single or multiple tables.


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Chapter 7 - Objectives

x How to perform calculations using QBE.

x How to use advanced QBE facilities including

parameter, find matched, find unmatched,

crosstab, and autolookup queries.

x How to use QBE action queries to changecontent of tables.


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Query-by-Example (QBE)

x Visual approach for accessing information in adatabase through use of query templates.

x Example values are entered into template torepresent what access to database is to achieve,such as the answer to a query.

x Originally developed by IBM in 1970s and hasproved so popular that QBE (or similar) is nowprovided by most DBMSs.

x When user constructs a BE - in back round


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Query-by-Example (QBE)

x 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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Introduction to Microsoft Access


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Summary of Microsoft Access Query Types


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Introduction to Microsoft Access QueriesQueries


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Building Select Queries using QBE -

Specifying Criteria (Demo- SQL View)


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Specifying Criteria


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Specifying Criteria


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Creating Multi-table Queries (p. 159)


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Calculating Totals


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Calculating Totals (p. 161)


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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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Summary

x The main features of Query-By-Example (QBE).

x The types of queries provided by the Microsoft

Access DBMS QBE facility.

x How to use QBE to build queries to select fieldsand records.

x How to use QBE to target single or multiple tables.


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Summary

x How to perform calculations using QBE.

x How to use advanced QBE facilities including

parameter, find matched, find unmatched,

crosstab, and autolookup queries.

x How to use QBE action queries to changecontent of tables.

chapter07 qbe examples

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