NIELIT 2016 MAR Scientist B - Section C: 41

admin asked Mar 31, 2020 • edited Oct 31, 2020 by soujanyareddy13

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The employee salary should not be greater than Rs.$2000$. This is

integrity constraint
referential constraint
over-defined constraint
feasible constraint

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admin asked Mar 31, 2020 • edited Oct 31, 2020 by soujanyareddy13

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Option A. Integrity Constraint

Saitheja Muthoju answered Apr 26, 2020

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NIELIT 2016 MAR Scientist B - Section C: 40
In a relational Schema, each tuple is divided into fields called relations domains queries none of these

In a relational Schema, each tuple is divided into fields calledrelationsdomainsqueriesnone of these

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NIELIT 2016 MAR Scientist B - Section C: 34
Global locks synchronize access to local resources. synchronize access to global resources. are used to avoid local locks. prevent access to global resources.

Global lockssynchronize access to local resources.synchronize access to global resources.are used to avoid local locks.prevent access to global resources.

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NIELIT 2016 MAR Scientist B - Section C: 42
The relational algebra expression equivalent to the tuple calculus expression $\{t\mid t \in r \land (t[A]=10 \land t[B]=20)\}$ is $\sigma_{(A=10\:\lor\:B=20)}(r)$ $\sigma_{(A=10)}(r)\cup\sigma_{(B=20)}(r)$ $\sigma_{(A=10)}(r)\cap\sigma_{(B=20)}(r)$ $\sigma_{(A=10)}(r)-\sigma_{(B=20)}(r)$

The relational algebra expression equivalent to the tuple calculus expression$\{t\mid t \in r \land (t[A]=10 \land t[B]=20)\}$ is$\sigma_{(A=10\:\lor\:B=20)}(r)$$...

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NIELIT 2016 MAR Scientist B - Section C: 44
For a database relation $R(a,b,c,d)$ where the domains of $a,b,c,d$ include only atomic values, only the following functional dependencies and those that can be inferred from them hold: $a\to c\\b\to d$ the relation is in first normal form but not in second normal form. second normal form but not in third normal form. third normal form. none of these.

For a database relation $R(a,b,c,d)$ where the domains of $a,b,c,d$ include only atomic values, only the following functional dependencies and those that can be inferred ...

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