This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: component is used for identifying the table(s) involved if >1 table, helps accomplish relational algebras join (together with WHERE component that specifies equal fields). SQLs WHERE component isolates rows (i.e., relational algebras select). It also helps accomplish relational algebras join and may be left blank for single-table queries that retrieve all rows D2. Query by Example (QBE): The user starts with a sample of the table(s) columns and marks the fields he or she wants to include in the answer. Defaults are available for summarizing and manipulating the data....
View Full Document
- Fall '11