Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Consider the following two commands C1 and C2...
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Consider the following two commands C1 and C2 on the relation R from an SQL database:
C1 : drop table R;
C2 : delete from R;
C2 : delete from R;
Which of the following statements is true?
I. Both C1 and C2 delete the schema for R.
II. C2 retains relation R, but deletes all tuples in R.
III. C1 deletes not only all tuples of R, but also the schema for R.
II. C2 retains relation R, but deletes all tuples in R.
III. C1 deletes not only all tuples of R, but also the schema for R.
- a)I only
- b)I and II
- c)II and III
- d)I, II and III
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Consider the following two commands C1 and C2 on the relation R from a...
Drop command remove all tuples of the relation as well as schema. Delete command in SQL removes tuples from the relation but retains the schema of table in database.
So, option (3) is correct.
So, option (3) is correct.
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Consider the following two commands C1 and C2 on the relation R from a...
Explanation:
When analyzing the given commands, it is important to understand the difference between dropping a table and deleting from a table in an SQL database.
Dropping a table:
Dropping a table is a command that removes the entire table from the database, including all data and the table schema. It essentially deletes the table structure and all its contents.
Deleting from a table:
Deleting from a table is a command that removes specific rows (tuples) from a table, but it does not remove the table structure or any other data in the table.
Now let's analyze the two commands:
C1: drop table R;
This command drops the table R, which means it deletes the table structure and all its contents. This includes deleting all tuples in the table R and also the schema for R. Therefore, statement III is true.
C2: delete from R;
This command deletes all tuples in the table R, but it does not delete the table structure or the schema for R. The table R retains its structure, but it becomes empty after executing this command. Therefore, statement II is true.
Combining the analysis of both commands, we can conclude that:
- Command C1 deletes the schema for R (statement III is true).
- Command C2 retains the relation R, but deletes all tuples in R (statement II is true).
Therefore, the correct answer is option C: II and III.
When analyzing the given commands, it is important to understand the difference between dropping a table and deleting from a table in an SQL database.
Dropping a table:
Dropping a table is a command that removes the entire table from the database, including all data and the table schema. It essentially deletes the table structure and all its contents.
Deleting from a table:
Deleting from a table is a command that removes specific rows (tuples) from a table, but it does not remove the table structure or any other data in the table.
Now let's analyze the two commands:
C1: drop table R;
This command drops the table R, which means it deletes the table structure and all its contents. This includes deleting all tuples in the table R and also the schema for R. Therefore, statement III is true.
C2: delete from R;
This command deletes all tuples in the table R, but it does not delete the table structure or the schema for R. The table R retains its structure, but it becomes empty after executing this command. Therefore, statement II is true.
Combining the analysis of both commands, we can conclude that:
- Command C1 deletes the schema for R (statement III is true).
- Command C2 retains the relation R, but deletes all tuples in R (statement II is true).
Therefore, the correct answer is option C: II and III.
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