Recent questions tagged referential-integrity

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Consider relation $S(D,E)$ with primary key $(D,E)$.The current instance of $S$ contains $(1,3)$, $(2,4)$, $(3,1)$.Relation $R(A,B,C)$ contains the foreign-key constraint...
3 3 votes
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Consider the relations $Parent(pid)$ and $Child(cid,pid)$where $Parent.pid$ is the primary key and $Child.pid$ is a foreign key referencing $Parent.pid$No cascading actio...
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Let $R(A,B,C)$ be a referencing relation and $S(D,E)$ be a referenced relation.Suppose $B$ is a foreign key of $R$ that references the candidate key $D$ of $S$.Which of t...
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Consider two relations $r$ and $s$ defined on the relational schemas $R(A, B)$ and $S(E, C)$, respectively. $A$ is the primary key of $R$ and $E$ is a foreign key of $S$ ...
3 3 votes
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In the case of referential integrity in RDBMS, there are solutions for INSERT, DELETE, and UPDATE operation problems on Referenced Table (or) Base Table like ON DELETE CA...
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Consider the two relations below. The primary keys are underlined. Identify all possible foreign key(s) from the options based only on the two relations.$\text{EMP (eid, ...
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Mention which of the following is a special type of integrity constraint that relates two relations & maintains consistency across the relations.Entity Integrity Constrai...
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2 answers 2 answers
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Consider the following schema: Create table A(a1 int not null primary key, a2 int); Create table B(b1 int not null primary key, b2 int references A(a1) on delete cascade ...
49 49 votes
7 answers 7 answers
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Consider the following statements $S1$ and $S2$ about the relational data model:$S1$: A relation scheme can have at most one foreign key.$S2$: A foreign key in a relation...
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Domain constraints, functional dependency and referential integrity are special forms of _______Foreign keyPrimary keyAssertionReferential constraint
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Following table has two attributes Employee_id and Manager_id, where Employee_id is a primary key and manager_id is a foreign key referencing Employee_id with on-delete c...
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How to represent referential integrity constraint in ER model?pls explain with diagram
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The following table has two attributes $X$ and $Y$ where $X$ is the primary key and $Y$ is the foreign key referencing $X$ with on-delete cascade.$\begin{array}{|c|c|} \h...
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I've some elementary doubts regarding Foreign keys (referential integrity) :Can a foreign key consist of a collection of attributes - ie. can two or more columns collecti...
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Referencing to this gate ques- https://gateoverflow.in/16095/gate2004_13-let-and-two-relation-schema-where-the-primary-keyLet R1 (A, B, C) and R2 (D, E) be two relation s...
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Consider the join of a relation R with a relation S. If R has 100 tuples and S has 9 tuples then the maximum and minimum sizes of the join respectively under referential ...
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select the correct statement from the following on referential integritySelect one:a. referential integrity constraints check whether the primary key, values are uniqueb....
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Consider the join of a relation R with a relation S. If R has 100 tuples and S has 9 tuples then the maximum and minimum sizes of the join respectively under referential ...
2 2 votes
1 answers 1 answer
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Let R (ABCD) and S(DEF). D is the foreign key in R that references primary key in S. Which of the following will not violation?a. Insertion in Rb. Insertion in Sc. Deleti...
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Match the following with respect to RDBMS :$\begin{array}{clcl} \text{(a)} & \text{Entity integrity} & \text{(i)} & \text{enforces some specific business rule that do not...
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Explain recursive foreign key with suitable example..
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How one to many relation refers a foreign key?
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1 answers 1 answer
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106 106 votes
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Consider the following tables $T1$ and $T2.$$$\overset{T1}{\begin{array}{|c|c|c|} \hline \textbf {P} & \textbf {Q} \\\hline \text {2} & \text{2 }\\\hline \text{3} & \te...
1 1 vote
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We can convert any weak entity set to a strong entity set by simply adding appropriate attributes. Why, then, do we have weak entity sets at all? $1)$ We want to avoid th...
2 2 votes
1 answers 1 answer
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The rule that a value of a foreign key must appear as a value of some specific table is called aReferential constraintIndexIntegrity constraintFunctional dependency
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What is on delete no action,on delete cascade, on delete set null action??explain through some eg??
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3 3 votes
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____ constraints ensure that a value that appears in one relation for a given set of attributes also appears for a certain set of attributes in another relation.Logical I...