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Consider employee (e_no, e_name, e_salary, d_code), dept(d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departments with at least one dependent.
SELECT e_name FROM employee, dependent, dept WHERE employee.d_code=dept.d_code AND employee.e_no=dependant.e_no AND d_name IN (‘ACCOUNTS', ‘PURCHASE') GROUP BY e_name HAVING COUNT (e_no)>=1
Define the Wait for graph Ans: The wait-for-graph is a directed graph and consist of nodes and directed arcs; the nodes of the graph are active transactions. An arc of the grap
What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
Normalize the following table upto and including the 3NF. Submit a 1 page printout of only the final set of normalized tables in Data Architect. Just use Data Architect to do the t
How can you terminate the MySQL Server? Typing the following in Command prompt will shut down the server completely as root user % mysqladmin -u root -p shutdown
Explain weak and strong entity sets? Weak and Strong entity sets: A physically powerful entity set has a primary key. All tuples in the group are distinguishable through that k
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
What are the advantages of creating a table from existing table?
Higher Normal Forms Is there more normal forms beyond BCNF? Yes, though, these normal forms are not based on the concept of functional dependence. More normalisation is needed if
Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
#question.explain diversity and magnitude of organic compounds and general properties?
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