Technical Interview Questions and Answers :: TCS
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Primary key cannot have null value whereas unique key can have null
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The PRIMARY KEY is the column(s) used to uniquely identify each row of a table.
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A FOREIGN KEY is one or more columns whose values are based on the PRIMARY or CANDITATE KEY values from the database.
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A UNIQUE KEY is one or more columns that must be unique for each row of the table.
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The UNIQUE KEY column restricts entry of duplicate values but entry of NULL value is allowed. In case of PRIMARY KEY columns entry of duplicate as well as
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IN PASS BY VALUE COPY OF VALUE IS PASSED TO THE FUNCTION SO THAT ORIGINAL VALUE CANNOT BE MODIFIED.
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ADDRESS OF VALUE IS PASSED TO THE FUNCTION SO THAT ORIGINAL VALUE CAN BE MODIFIED
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No Discussion on this question yet!
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No Discussion on this question yet!
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1. C can run most of the code of C, but C can't run C code.
2. C supports procedural programming paradigm whereas C supports both procedural and object oriented programming paradigm.
3. C is a function driven and C is an object driven language.
4. C doesn't allow function definitions within structures whereas in C function definition can be within structures.
5. C doesn't support reference variables but C does support.