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What is an INDEX as defined in ORACLE?
Indexes in Oracle - Index is classically a listing of keywords accompanied through the location of information on a subject. Instead, an index can be viewed as an auxiliary table that contains two fields: the key and the location of the record of in which key. Indexes are used to improve the performance of the search operation. Indexes are not strictly essential to running Oracle, they do speed the procedure.
Why, generally does an object-oriented system use the relational DBMS? The reasons for using relational DBMS for OO systems could be any combination of following: a. Many or
Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even
What is the use of sub queries? A sub query is a select-from-where expression that is nested with in another query. A common use of sub queries is to do tests for set membershi
Storage Of Database On Hard Disks At this point, it is worthwhile to note the difference among the terms file Organisation and the access method. A file organisation shows to t
atient(PNumber, Name, NHS_no, Amount_due, DNO, Doctor, Medical_Treatment), relation of schema Staff(StaffNum, Name, DNO, Task) and relation of schema Dept(DNO, Name, Location, Dire
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
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Define the following constraints for the table client. (i) BAL_DUE must be at least 1000. (ii) NAME is a unique key. (i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1
What are the comparison operator in SQL? Comparison operator in SQL are =, LIKE and BETWEEN
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
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