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The result of the UNION operation between R1 and R2 is a relation that includes?
The result of the operation between R1 and R2 includes all the tuples of R1 and R2 which have common columns.
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
online eductional management system ke diagram
Explain the systems development life cycle. This is the traditional method to develop, maintain, and replace information systems that contains the project identification and se
State the Steps of Object Design Object design is a very iterative process in which various classes, relationships among objects are added when you move from one level to
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
What is NULL? Simply NULL means not in value.
Consider the relations EMP(ENO,ENAME,AGE,BASIC_SALARY) WORK_IN(ENO,DNO) DEPT(DNO,DNAME,CITY) Express the following queries in SQL (i) Find names of employees who work in a dep
Can we delete data element, which is being used by table fields. No we cant delete data element.
What is the difference between serial and sequential files? How searching is applied on both? Ans: A serial file is one where the records have been stored in the order where
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