Query Languages Structured Query Language SQL SELECT attributes What attributes

Query languages structured query language sql select

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Query Languages Structured Query Language (SQL) SELECT attributes What attributes are we interested in? FROM tables What tables contain those attributes? WHERE criteria Which rows? Query by example (QBE) Drag and drop GUI designer Built in to Access and other packages
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Tables Customer # Name Address Contact Person Phone 3450 Brownsville, C.C. Brownsville, TX Smith (956) 555-0531 3451 Educate, Inc. Fairhaven, MA Costa (508) 888-4531 3452 Bunker Hill College Bunker Hill, MA LaFrank (617) 888-8510 ISBN Author Title Price Quantity on Hand Quantity Allocated 0-256-23696-7 Barnes Introduction to Business $78.35 4,000 300 0-127-35124-8 Cromwell Building Database Applications $65.00 3,500 0 0-135-22456-7 Cromwell Management Information Systems $68.00 5,000 50 0-146-18976-4 Johnson Principles of Accounting $70.00 8,000 260 0-145-21687-7 Platt Introduction to E-commerce $72.00 5,000 40 0-235-624-6 Rosenberg HTML and Javascript Primer $45.00 6,000 0 Order # Order Date Customer # Status 0100011 05/11/06 3451 Open 0100012 05/15/06 3451 Open 0100013 05/16/06 3450 Open Order # ISBN Quantity 0100011 0-256-23696-7 200 0100011 0-146-18976-4 150 0100012 0-135-22456-7 50 0100012 0-146-18976-4 75 0100012 0-145-21687-7 40 0100013 0-146-18976-4 35 0100013 0-256-23696-7 100 Inventory Customer Order Order_Detail
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Input Forms Forms are used to enter data in to tables Relationships between tables and forms One form for manipulating data in one table One form for manipulating data in more than one table More than one form for manipulating data in one table Types of forms Single-record entry Modify/add a single record in a single table Tabular entry form Modify/add several records in a single table Multi-table entry form Modify/add records in two or more related tables
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Single-record Entry Form Often used to maintain master files One file can be associated with many forms Segregation of duties Inventory Maintenance Form ISBN Author Title Inventory Price Maintenance Form ISBN Price Inventory clerk Sales Manager
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Tabular Entry Form Used to record a batch of events Often set up like a spreadsheet Enter These Looked up for display & verification Check Total Cash Receipt Form
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