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Describe in brief about the Sequence Diagrams
Sequence diagrams are interaction diagrams which emphasize time ordering of messages. In UML, it is shown as a table which shows objects arranged along the X axis and messages ordered in rising time along the Y axis. It has a global life line and focus of control. An object life line is vertical dashed line which represents existence of an object over a period of time. The focus of control is tall and thin rectangle which shows period during that an object is performing an action. The notation for depiction of sequence between objects with certain conditions is shown as:
Figure: Sequence diagram
Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is: If R has m tuples and S has n tuples then maximum siz
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Differentiate between join and outer join? Outer joins return all rows from at least one of the tables or views mentioned within the FROM clause, as long as those rows get toge
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