Relational DB: True or False?

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Relational DB basics: true or false

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Relational DB: True or False?


Relational DB: True or False?Version en ligne Relational DB basics: true or false par Rakshitha 1 Relational calculus stores data in a hierarchical structure. Yes No 2 Relational algebra is a non-procedural language. Yes No 3 In SQL, the UPDATE command is used to query data. Yes No 4 The relational model stores data in tables. Yes No 5 A column in a table is called a record. Yes No 6 A table in a relational database is called a relation. Yes No 7 Each row in a relation is called a tuple. Yes No 8 SQL stands for Structured Query Language. Yes No 9 The SELECT command is used to delete data from a table. Yes No 10 Each column in a table is called an attribute. Yes No 11 A foreign key references a primary key in another table. Yes No 12 NOT NULL constraint allows NULL values. Yes No 13 DROP command removes a table from the database. Yes No 14 DELETE command removes records from a table. Yes No 15 DROP command only removes data from a table, not the table itself. Yes No 16 A primary key can have duplicate values. Yes No 17 UPDATE command modifies existing data. Yes No 18 The UNIQUE constraint ensures all values are different. Yes No 19 CREATE command is used to create tables. Yes No 20 CREATE command is used to delete existing tables. Yes No 21 SQL is case sensitive. Yes No 22 Projection operation selects columns from a table. Yes No 23 Relational algebra operations manipulate relations. Yes No 24 Join dependency is related to 5NF. Yes No 25 5NF is not related to project-join normal form. Yes No 26 4NF removes multivalued dependencies. Yes No 27 A relation can have duplicate tuples. Yes No 28 Relational algebra operations do not manipulate relations. Yes No 29 A database cannot contain multiple tables. Yes No 30 5NF is also called Project-Join Normal Form. Yes No 31 Normalization reduces redundancy in a database. Yes No 32 First Normal Form eliminates repeating groups. Yes No 33 Second Normal Form removes partial dependency. Yes No 34 Third Normal Form removes transitive dependency. Yes No 35 BCNF is stronger than 3NF. Yes No 36 A table in 1NF can contain multivalued attributes. Yes No 37 A table in 2NF must be in 1NF. Yes No 38 A table in 3NF must be in 2NF. Yes No 39 BCNF requires every determinant to be a candidate key. Yes No 40 Multivalued dependency is handled in 4NF. Yes No 41 A view is a virtual table. Yes No 42 A view stores data permanently. Yes No 43 INNER JOIN returns only matching records. Yes No 44 LEFT JOIN returns all rows from the left table. Yes No 45 RIGHT JOIN returns all rows from the right table. Yes No 46 A subquery is a query inside another query. Yes No 47 Data integrity ensures accuracy and consistency of data. Yes No 48 Database security protects data from unauthorized access. Yes No 49 Functional dependency describes relationship between attributes. Yes No 50 If A determines B, it is written as A → B. Yes No

Relational DB: True or False?

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Relational DB: True or False?Version en ligne

par Rakshitha

Relational calculus stores data in a hierarchical structure.

Relational algebra is a non-procedural language.

In SQL, the UPDATE command is used to query data.

The relational model stores data in tables.

A column in a table is called a record.

A table in a relational database is called a relation.

Each row in a relation is called a tuple.

SQL stands for Structured Query Language.

The SELECT command is used to delete data from a table.

Each column in a table is called an attribute.

A foreign key references a primary key in another table.

NOT NULL constraint allows NULL values.

DROP command removes a table from the database.

DELETE command removes records from a table.

DROP command only removes data from a table, not the table itself.

A primary key can have duplicate values.

UPDATE command modifies existing data.

The UNIQUE constraint ensures all values are different.

CREATE command is used to create tables.

CREATE command is used to delete existing tables.

SQL is case sensitive.

Projection operation selects columns from a table.

Relational algebra operations manipulate relations.

Join dependency is related to 5NF.

5NF is not related to project-join normal form.

4NF removes multivalued dependencies.

A relation can have duplicate tuples.

Relational algebra operations do not manipulate relations.

A database cannot contain multiple tables.

5NF is also called Project-Join Normal Form.

Normalization reduces redundancy in a database.

First Normal Form eliminates repeating groups.

Second Normal Form removes partial dependency.

Third Normal Form removes transitive dependency.

BCNF is stronger than 3NF.

A table in 1NF can contain multivalued attributes.

A table in 2NF must be in 1NF.

A table in 3NF must be in 2NF.

BCNF requires every determinant to be a candidate key.

Multivalued dependency is handled in 4NF.

A view is a virtual table.

A view stores data permanently.

INNER JOIN returns only matching records.

LEFT JOIN returns all rows from the left table.

RIGHT JOIN returns all rows from the right table.

A subquery is a query inside another query.

Data integrity ensures accuracy and consistency of data.

Database security protects data from unauthorized access.

Functional dependency describes relationship between attributes.

If A determines B, it is written as A → B.