Quick Answer: Which of the following SQL clauses is used to delete tuples from a database table?

3. Which of the following SQL clauses is used to DELETE tuples from a database table? Explanation: The SQL DELETE Query is used to delete the existing records from a table.

Which of the following SQL clause is used to delete table from a database table?

Explanation: The TRUNCATE statement in SQL removes all data from the table and free the table’s space. SQL’s DELETE statement removes all data from the table but does not free the table’s space.

Which SQL function is used to count the number of rows in a SQL query Mcq?

The SQL COUNT( ) function is used to return the number of rows in a table. It is used with the Select( ) statement.

Which of the following is TCL command?

TCL (Transaction Control Language) :

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Transaction Control Language commands are used to manage transactions in the database. These are used to manage the changes made by DML-statements. It also allows statements to be grouped together into logical transactions.

Which of the following statement is true delete does not free the space containing the table and truncate free the space containing the table both delete and truncate free the space containing the table both delete and truncate does not free the space containing the table delete?

ANSWER : DELETE does not free the space containing the table and TRUNCATE free the space containing the table. Explanation : :The SQL TRUNCATE command is used to delete all the rows from the table and free the space containing the table. Explanation : : None.

Which of the following is used to delete the entries in the referenced table?

Discussion Forum

Que. Which of the following is used to delete the entries in the referenced table when the tuple is deleted in course table? CREATE TABLE course ( . . . FOREIGN KEY (dept name) REFERENCES department . . . );
b. Delete cascade
c. Set null
d. All of the mentioned
Answer:Delete cascade

Why as clause is used in SQL?

SQL AS keyword is used to give an alias to table or column names in the queries. In this way, we can increase the readability and understandability of the query and column headings in the result set.

Which of the following SQL clause is used to delete?

Explanation: The SQL TRUNCATE command is used to delete all the rows from the table and free the space containing the table. 10. What is the purpose of the SQL AS clause?

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Which SQL keyword is used to delete a table’s structure?

The SQL keyword DELETE is used to delete a table’s structure. When the correct SQL command is used to delete a table’s structure, the command can only be used with a table that has already had its data removed.

Is commit a TCL command?

COMMIT, ROLLBACK and SAVEPOINT are the TCL commands used in SQL.

Is truncate a DDL command?

Although TRUNCATE TABLE is similar to DELETE , it is classified as a DDL statement rather than a DML statement. … Truncate operations drop and re-create the table, which is much faster than deleting rows one by one, particularly for large tables. Truncate operations cause an implicit commit, and so cannot be rolled back.

What are the DML commands?

Some commands of DML are:

  • SELECT – retrieve data from the a database.
  • INSERT – insert data into a table.
  • UPDATE – updates existing data within a table.
  • DELETE – deletes all records from a table, the space for the records remain.
  • MERGE – UPSERT operation (insert or update)
  • CALL – call a PL/SQL or Java subprogram.
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