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Describe the definition of a transaction in SQL
Ans: The SQL transaction starts implicitly. Transactions are finished by either Commit work that commits the transaction and starts a new one Rollback work that causes the transaction to abort.
If a program ends without either of these statements after that updates are either committed or rolled back and the selection is implementation dependent.
Load sample data into the database tables design and test queries to return the following information • All rows and columns for employees • All rows and columns for customers •
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
What are advantages of object models? Object models are efficient for communicating with the application experts and reaching a consensus about the significant aspects of the p
What are the states of transaction? The states of transaction are:- a) Active b) Partially committed c) Failed d) Aborted e )Committed f) Terminated
Problem : (b) A deductive database system is essentially the outcome of applying mathematics logic to database management, where logic is used for both data representation and
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
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Consider employee table of (i) and list names of department(s) for which average salary for department is more than 10,000. (SELECT d_name FROM dept WHERE d_code IN (SELECT d_c
The Enhanced Entity Relationship Diagram (ERD) produced with a drawing or case tool. Your EERD must use a ''standard'' notation style such as Crows Foot or Chen. Please note that t
Define Deadlock avoidance These protocols as well ensure that the system will never enter a deadlock state although the way it is done is different from deadlock prevention. I
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