Computer Science
Assertion (A): In hierarchical model, searching for a record is a time-consuming task.
Reasoning (R): Hierarchical model owns to the organization of information/data in a tree-like structure.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
SQL Queries
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation
The hierarchical model arranges data in a tree structure, where each record has a parent-child relationship. Searching for a specific record in such a model may require traversing through multiple levels of the hierarchy, which is time-consuming.
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Which function is used to display the total number of records from a table in a database?
- Sum(*)
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- Return(*)
With SQL, how do you select all the records from a table named "Persons", where the value of the column "FirstName" ends with an "a"?
SELECT * FROM Persons WHERE FirstName = 'a';SELECT * FROM Persons WHERE FirstName LIKE 'a%';SELECT * FROM Persons WHERE FirstName LIKE '%a';SELECT * FROM Persons WHERE FirstName = '%a%';
Assertion (A): RDBMS stands for Relational Database Management System.
Reasoning (R): RDBMS does not allow relating or associating two tables in a database.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): A database is the largest component for holding and storing data and may contain several tables.
Reasoning (R): Each table comprises multiple rows and records.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.