Databases Competency Explain advanced database concepts and functions.

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Presentation transcript:

Databases Competency Explain advanced database concepts and functions.

Retrieving Data 1. Open the database program 2. Select the desired database file and click open.

Open a Table in a Database File Select the proper table to open

Displaying Database Tables Example: DATASHEET VIEW of the MusicFun Table from the TUNES database

Use Filters to Select Data  Filter: Displays records in a database that match specified criteria.  Advantages of using filters  Easier to use than query  Fast  Disadvantages of filters  All fields are displayed when using a filter  Cannot save filters like queries  Types of filters  By Form (key criteria into a form; more flexible because criteria can be set for more than one field)  By Selection (quick/easy option by highlighting a cell as criteria)  Excluding Selection (excludes data highlighted in cell)  Advanced Filter/Sort (works like a query)

Advanced Filter/Sort Menu Choose the RECORDS Menu, FILTER command, Advanced filter/sort

Build a Query Query: A database object that allows the user to select records/data from a database using multiple criteria (comparison operators) and arrangement (sorting) standards.  Advantages  Queries can be saved  Each table can be associated with multiple queries

Set Conditions for Query Field Affected Sort Order Criteria: ‘Release Date’ > ‘7/01/2004’

Comparison Operators for Queries and Filters  Equals=  Does not equal<>  Between andbetween and  Less than<  Greater than>  Equal to or less than<=  Equal to or greater than>=

Query: Advanced Criteria  AND Condition: Uses the same row in the Query Design window  The AND condition reduces the number of records because both conditions must be met.  OR Condition: Uses different rows in the Query Design window  The OR condition increases the number of records because records are selected if either condition is met.

Query: AND Condition Criteria: Genre = “Rock” AND Release Date after 2002 Results AND condition listed on ONE line

Query: OR Condition Results Genre = Country OR Rock And Release Date Greater than 01/01/2000 OR Condition takes 2 lines!

Search Records  To search for specific records, select Find command from the Edit menu.  Key the search string (data) in the dialog box.  Key “where” to find the records (which table).  Similar to Find/Replace commands in other programs  Not case sensitive

Sorting  To sort is to arrange data in a specific order.  Ascending sort: Alphabetical order (A to Z) or numerical order (1 to 9)  Descending sort: Reverse alphabetical order (Z to A) and largest to lowest number (9 to 1)  Simple sort: Arranges by only one field  Complex sort: Arranges data by multiple fields (first field, primary; second field, secondary)

Sort Using the Toolbar Ascending Descending

Complex Sort Multiple field sort: Primary sort – first field chosen Secondary sort – second field chosen

Datasheet View Sort  In Datasheet View, sorted fields must be highlighted and adjacent (sides touching).  Sort priority: sort left to right  Leftmost column (field) = primary sort  Next field = secondary sort

The Database Report A database object used to organize, summarize, and print all or some of the data in a database.

Advantages of a Report  Data is viewed in an attractive format  Allows variations in fonts, colors, shading, and borders  Allows page layout design  Allows images to be inserted  Shows specific fields or selected records rather than an entire table  Allows records to be grouped/sorted with summaries and totals  Displays fields from multiple tables

Plan and Create a Report  Determine the table/queries to be used in the report  Determine what fields/data will be desired in the report  Plan the groupings and summary totals if desired  Enhance the appearance and design before printing

Determine the Fields Required Using the Report Wizard, select the desired fields for the report from the table or query.

Organize the Report with Grouping This report will be “grouped” by name.

Sort Data in the Report Sorting a field within the selected group will further organize the report.

Design the Appearance Follow the Wizard’s Next Steps to format the design, style, and appearance of the report. Name and preview the completed report.

Insert Pictures/Customize Database Reports Insert pictures, labels, text boxes, and other graphic elements while in Design View.

Database Relationships  Relationship - A linked connection between two tables that share a common field.  Join Line - graphically represents the relationship between two tables  The related field between the two tables must be of the same data type and size

Establishing Relationships One record in the Student Table is related to one record in the Participation Table Relationship established between two tables