Queries
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Queries

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  • 5.02 Queries
  • 5.02 Queries
  • 5.02 Queries
  • 5.02 Queries
  • 5.02 Queries
  • 5.02 Queries
  • 5.02 Queries

Queries Queries Presentation Transcript

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