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Mark Dixon Page 1 02 – Queries: Query by Example
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Mark Dixon Page 2 Questions: Databases Consider the following table: a) How many records does it contain? b) How many fields does it contain? 9 6
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Mark Dixon Page 3 Session Aims & Objectives Aims –Introduce you to queries Objectives, by end of this week’s sessions, you should be able to: –create a query using 'query by example' to: extract a subset of records and fields from a database table
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Mark Dixon Page 4 Creating Queries: New Query Select the database window Select queries option Double click on Create Query in Design view
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Mark Dixon Page 5 Creating Queries: Add Table Click Add button Click Close button
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Mark Dixon Page 6 Creating Queries: Add Fields Drag field names into query
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Mark Dixon Page 7 View you Query Click View button
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Mark Dixon Page 8 Return to Query Design Click View button again
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Mark Dixon Page 9 Modify your Query Type in criteria
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Mark Dixon Page 10 Criteria Massive variety – very powerful: > greater than < less than = equal to >= greater than or equal to <= less than or equal to <> not equal to Like "*or*" * means any text (i.e. contains "or")
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Mark Dixon Page 11 Tutorial Exercise 1: Plants database LEARNING OBJECTIVE: to understand table, field, and record, so that you can create your own database with a single table containing several fields and records using MS Access TASK: Create the plants database (shown in earlier slide).
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Mark Dixon Page 12 Tutorial Exercise 2: Plants database LEARNING OBJECTIVE: to understand queries, so that you can create your own query that displays selected fields and records from a table using MS Access TASK 1: Create the query (shown in earlier slide). TASK 2: Experiment with Show, Sort and Criteria combinations
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