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An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not?
If relational schema R (A, B, C) has distinct values of A including NULL values A is not a candidate key.
Discuss the count function? The COUNT function used returns the number of tuples or values fixed in a query. The count function comprises two types of syntax: (1) COUNT (*)
Define Two phase commit Two phase commit: To make sure atomicity, all the sites where a transaction is being executed must agree on the final outcome of the execution. The tran
Determine the Strong and Weak Entity Based on the method of foreign key, there might be arise a situation when we have to relate an entity having a primary key of its own and a
The basic merits of decomposition. The Advantages of Decomposition 1. Separate person can work on each subsystem. 2. A particular software engineer can specialize in a
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
Construct a clean ans concise ER diagram for the database indicating the cardinality mapping for Employee management syatem
What three major types of actions includes databases? Briefly discuss these The three major types of actions including databases are: (i) Defining: It includes specifyin
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
what do you mean by consistency in rdbms?
Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros
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