Class 8 Exam > Class 8 Questions > Which of the following statement is true?a)Fo...
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Which of the following statement is true?
- a)Foreign key fields don’t allow duplicate values
- b)In primary key field you can enter duplicate value
- c)In an indexed field you may or may not enter duplicate value depending upon setting
- d)All statements are true
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statement is true?a)Foreign key fields don&rsqu...
Statement Analysis:
The given statement asks to determine which of the following statements is true among the four options provided. Let's analyze each statement one by one to determine its accuracy.
A: Foreign key fields don't allow duplicate values
- A foreign key is a field in a relational database table that is used to establish a link between two tables.
- The purpose of a foreign key is to maintain referential integrity between the two tables.
- A foreign key can have duplicate values as it represents a relationship between two tables and multiple records can have the same relationship.
B: In primary key field, you can enter duplicate values
- A primary key is a unique identifier for each record in a table.
- It must have a unique value for every record and cannot contain duplicate values.
- Therefore, this statement is false. In a primary key field, duplicate values are not allowed.
C: In an indexed field, you may or may not enter duplicate values depending upon the setting
- An indexed field is a field that has an index created on it, which improves the performance of searching and sorting records.
- The index can be set to allow or disallow duplicate values based on the requirement.
- So, this statement is true. In an indexed field, you can have duplicate values depending on the index setting.
D: All statements are true
- This statement is false as we have already determined that statement B is false.
Summary:
Based on the analysis, the correct answer is Option C: In an indexed field, you may or may not enter duplicate values depending upon the setting.
The given statement asks to determine which of the following statements is true among the four options provided. Let's analyze each statement one by one to determine its accuracy.
A: Foreign key fields don't allow duplicate values
- A foreign key is a field in a relational database table that is used to establish a link between two tables.
- The purpose of a foreign key is to maintain referential integrity between the two tables.
- A foreign key can have duplicate values as it represents a relationship between two tables and multiple records can have the same relationship.
B: In primary key field, you can enter duplicate values
- A primary key is a unique identifier for each record in a table.
- It must have a unique value for every record and cannot contain duplicate values.
- Therefore, this statement is false. In a primary key field, duplicate values are not allowed.
C: In an indexed field, you may or may not enter duplicate values depending upon the setting
- An indexed field is a field that has an index created on it, which improves the performance of searching and sorting records.
- The index can be set to allow or disallow duplicate values based on the requirement.
- So, this statement is true. In an indexed field, you can have duplicate values depending on the index setting.
D: All statements are true
- This statement is false as we have already determined that statement B is false.
Summary:
Based on the analysis, the correct answer is Option C: In an indexed field, you may or may not enter duplicate values depending upon the setting.
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Community Answer
Which of the following statement is true?a)Foreign key fields don&rsqu...
Are used to establish relationships between tables in a database.
b)Foreign key fields cannot be used as primary keys in a table.
c)Foreign key fields can only be used to reference primary key fields in another table.
d)Foreign key fields are not used in relational databases.
b)Foreign key fields cannot be used as primary keys in a table.
c)Foreign key fields can only be used to reference primary key fields in another table.
d)Foreign key fields are not used in relational databases.
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Which of the following statement is true?a)Foreign key fields don’t allow duplicate valuesb)In primary key field you can enter duplicate valuec)In an indexed field you may or may not enter duplicate value depending upon settingd)All statements are trueCorrect answer is option 'D'. Can you explain this answer?
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