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Which one of the following commands is used for removing (or deleting) a relation forms the SQL database?
- a)Delete
- b)Drop
- c)Remove
- d)All of the above
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which one of the following commands is used for removing (or deleting)...
Explanation:
In SQL, the command used for removing or deleting a relation or table from the database is the DROP command. This command permanently removes the specified relation from the database.
Details:
The DROP command is used to delete an entire relation or table along with all its data and associated objects such as indexes, constraints, triggers, etc. It is a powerful command that should be used with caution as it cannot be undone and the data will be lost permanently.
Syntax:
The syntax of the DROP command is as follows:
```
DROP TABLE table_name;
```
Here, `table_name` refers to the name of the relation or table that needs to be dropped.
Example:
Suppose we have a relation named "employees" in our database, and we want to delete it. We can use the DROP command as follows:
```
DROP TABLE employees;
```
This command will remove the "employees" relation from the database, along with all its data and associated objects.
Alternative commands:
- The DELETE command is used to delete specific rows or records from a relation, but it does not remove the entire relation itself. It is used to remove specific data from a table based on certain conditions.
- The REMOVE command is not a standard SQL command for removing relations. It may be a command specific to certain database management systems or programming languages.
- Therefore, the correct answer is option B) Drop, as it is the standard SQL command used for removing or deleting a relation or table from the database.
In SQL, the command used for removing or deleting a relation or table from the database is the DROP command. This command permanently removes the specified relation from the database.
Details:
The DROP command is used to delete an entire relation or table along with all its data and associated objects such as indexes, constraints, triggers, etc. It is a powerful command that should be used with caution as it cannot be undone and the data will be lost permanently.
Syntax:
The syntax of the DROP command is as follows:
```
DROP TABLE table_name;
```
Here, `table_name` refers to the name of the relation or table that needs to be dropped.
Example:
Suppose we have a relation named "employees" in our database, and we want to delete it. We can use the DROP command as follows:
```
DROP TABLE employees;
```
This command will remove the "employees" relation from the database, along with all its data and associated objects.
Alternative commands:
- The DELETE command is used to delete specific rows or records from a relation, but it does not remove the entire relation itself. It is used to remove specific data from a table based on certain conditions.
- The REMOVE command is not a standard SQL command for removing relations. It may be a command specific to certain database management systems or programming languages.
- Therefore, the correct answer is option B) Drop, as it is the standard SQL command used for removing or deleting a relation or table from the database.
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Community Answer
Which one of the following commands is used for removing (or deleting)...
To removing( or deleting) a relation, the "drop" command is used instead of delete because here we are working on the objects of the database. So, to maintain the objects of a database, the Data definition language is used. Therefore the "drop" command is used to delete a relation form a database instead of using the "delete" command.
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Which one of the following commands is used for removing (or deleting) a relation forms the SQL database?a)Deleteb)Dropc)Removed)All of the aboveCorrect answer is option 'B'. Can you explain this answer?
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