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Aggregate functions
Example: Find the total number of employees.
SELECT COUNT (*) FROM EMP;
Example: //Find the minimum, maximum and average salaries of employees of department D1//.
SELECT MIN(SAL), MAX (SAL), AVG(SAL) FROM EMP
WHERE DEPTNO = 'D1' ;
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
About Attribute inheritance
What is Relational calculus? Relational calculus is a Non- Procedural language.
Define granularity, hierarchy of granularity of locks & multiple granularity locking. Explain the modified two phase locking along with multiple granularity locking. Ans: The s
Briefly explain each of the following database terms. Use no more than 2-3 lines for each term. 1. DBMS 2. Update Anomaly 3. Alias (referring to tables in SQL queries)
WHAT IS SQL
Given the following set of functional dependencies {cf?bg, g?d, cdg?f, b?de, d?c} defined on R(b,c,d,e,f,g) a.Find a non-redundant cover. b.Find a canonical cover.
Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
Breaking into Subsystems Decomposition is a significant technique for coping with complexity based on idea of divide and conquers. In dividing a problem into sub problems, the
The database application project (DAP) for this assignment consists of the creation of a fully functional Microsoft Access database application for a real client. I recommend you s
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