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Explain data independence ? Data independence is the capacity to modify the schema at one stage of a database system without having to change the schema at the further level.
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CREATE TABLE prodtrans ( pno number (4) ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5) FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);
Explain the difference between optimistic locking and pessimistic locking. Optimistic locking supposes no transaction conflict will occur and deals with the consequences if it
Can we delete data element, which is being used by table fields. No we cant delete data element.
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
to develop elrctronic database from manual forms
explain multi key file organisation
What is the meaning of Data Independence ?
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
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