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What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
what is cascading? what is rollback cascading? please explain in detail
Extend your CREATE TABLE statement from problem 3 with referential integrity constraints. Updates and deletes on related rows are restricted. 6. From examination of the sample data
Whst is logical schema ? Logical schema is the entire database.
wh
external and internal mapping with examples
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks
write short note on mobile database
Define lock? Lock is the most common used to execute the requirement is to permit a transaction to access a data item only if it is currently holding a lock on that item.
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