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What are primary keys and foreign keys?
Primary keys are the unique identifiers for every row. They must have unique values and cannot be null. Due to their significance in relational databases, Primary keys are the most fundamental of all keys and constraints. A table can have only one Primary key. Foreign keys are both a method of ensuring data integrity and a manifestation of the relationship among tables.
Ask queCreate a telephone directory. The heading should be 16-point Arial Font in bold The rest of the document should use 10-point font size Otherheadingsshould use 10-point Cour
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explain about relations
Stack unwinding in C++ is a process during exception handling when the destructor is known for all local objects the place where the exception was thrown and where it is caught.
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What are the main features of UML Defined system structure for the object modelling Support for all different model organization Strong modelling for behaviour an
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