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In tuple relational calculus P1→ P2 is equivalent to ?
A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning if A then B,is equivalent to ¬A V B)
Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
what is 3nf
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Our company hires independent contractors to install equipment at precise locations across North America. We want to track the installation data and generate reports. The compan
Create Relational Database Model (RDM) for Sailing bed and breakfast club Table_Name( attribute_1, attribute_2, attribute_3, ? ,attribute_x) Primary Key ( attribute_1, attribute_2)
Define Boyce codd normal form A relation schema R is in BCNF with respect to a set F of functional dependencies if, for all functional dependencies in F + of the form.α ->β.
Express the following queries in SQL: (a) Write the SQL code that will create ALL the four tables given in the appendix. Your answer should not contain the primary key and
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
Let us first look into some of the important features of ER model. Entity relationship model is a high-level conceptual data model. It permits us to define the data invo
What is the archtetype/instance pattern? The archetype/instance pattern happens when one entity tracks occurrences of another entity. A common example is the relationship among
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