DBMS-Relational Query Languages

DBMS-Relational Query Languages
1. The DISTINCTkey words is illegal for MAX and MIN
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2. Application written in SQL can be easily ported across systems.
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3. Query-ByExample (QBE) is a two-dimentional domain calculus language.
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4. Query-ByExample (QBE) is a two-dimentional domain calculus language.
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5. QBE was originally developed by M.M. Zloof at IBM'S T.J. Waston Research Centre.
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6. QBE represents a visual approach for accessing information in a database through the use of query template.
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7. The QBE make-table action query is an action query as it perform an action on existing table or tables to create a new table.
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8. QBE difers from SQL in that the user does not have to specify a structured query explicity.
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9. In QBE, user does not have to remember the names of the attributes or relations, because they are displayed as part of the template.
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10. The delete action query of QBE deletes one or more than one records from a table or more than one table.
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