Computer Apps 1
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Transcript of Computer Apps 1
Queries
• Query – a database object that requests information from a database and creates a dataset (list of selected records) matching the requested information
• Query Design View – a window that allows one to choose the fields in a query, to sort, and to set criteria.
• Query Design Grid – the lower half of the Query Design view that shows the field name, table name, sort order, show box, and criteria rows for selecting records.
Queries – Questions
• Queries are like advanced filters except a query can be saved and stored in the database window.
• Queries also perform specialized operations like performing calculations on field values and placing the results in a new column in a datasheet.
• Similar to advanced filters, queries allow sorting and defining of criteria to select the records desired.
Select Fields and Set Criteria
Step 1: Select queries.
Step 2: Select Create query.
Step 3: Select fields; Set criteria and/or sorting requirements.
Step 4: Run the query.
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Query Results
Records displayed included:
*Genre = “Classical”
*Artist name sorted in ascending order
*CD Title
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
Comparison Operators for Queries and Filters
• Equals =
• Does not equal <>
• Between and between 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 ConditionResults
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
Printing Tables – Portrait View
Always check printouts using PRINT PREVIEW before printing.
Use the menu bar and select File/Page, Setup/Page to change the orientation. Portrait - Taller
than wide view