Queries Objective 5.02 Understand queries, forms, and reports used in business.

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Presentation transcript:

Queries Objective 5.02 Understand queries, forms, and reports used in business.

5.02 Understand database queries, forms, and reports used in business.Slide 2 Database Objects ► Objective 5.01 discussed and explained how tables are the building blocks for all databases. ► This objective will use tables to create three types of database objects:  Queries  Forms  Reports

5.02 Understand database queries, forms, and reports used in business.Slide 3Query ► A database object created by placing filters and selecting multiple criteria (comparison operators) to extract information from one or more tables

5.02 Understand database queries, forms, and reports used in business.Slide 4 Advantages of a Query ► Can be saved and used to perform other operations. ► One table can be associated with multiple queries. ► Can perform specialized operations  For example, calculations can be performed on field values and the results can be placed in a new column of a datasheet.

5.02 Understand database queries, forms, and reports used in business.Slide 5 The Difference Between Queries and Filters ► A filter is a one-time deal. It allows application of a set of selection criteria and/or sorting instructions to the records in a table. It is a quick and temporary tool that is created for one-time use in the context of a particular table. ► A query is reusable. It allows the selection criteria and/or sorting instructions to be saved and reused.

5.02 Understand database queries, forms, and reports used in business.Slide 6 Comparison Operators for Queries and Filters Less Than < Greater Than > Equal To = Less Than or Equal To <= Greater Than or Equal To >= Not Equal To <>

5.02 Understand database queries, forms, and reports used in business.Slide 7 Conditional Operators for Queries and Filters ► The AND condition reduces the number of records because both conditions must be met. ► The OR condition increases the number of records because records are selected if either condition is met.