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What is transaction?
Transaction is a unit of program implementation that accesses and possibly updated several data items.
The Transactions- A transaction is definite as the unit of work in a database system. Database systems that deal with a huge number of transactions are also termed as transaction p
external and internal mapping with examples
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
Describe the development process of Object oriented methods Object oriented methods have roots which are strongly anchored back in the 60s, functional and structured methods we
Differentiate between join and outer join? Outer joins return all rows from at least one of the tables or views mentioned within the FROM clause, as long as those rows get toge
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
What is relationship instance ? Relationship Instance - A relationship is a relation between two or more entities. An instance of relationship set is a set of relationships.
I need to Map an E-R diagram to a relational schema
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