Question
Which of the following commands is part of the
Transaction Control Language (TCL) in SQL?Solution
Transaction Control Language (TCL) commands in SQL are used to manage transactions in a database, ensuring that operations are executed reliably. COMMIT is a TCL command that finalizes a transaction, making all its changes permanent in the database. For example, in a banking application, if a transaction involves debiting one account and crediting another, the COMMIT command ensures these changes are saved only when both operations succeed. This guarantees data integrity. Without TCL commands like COMMIT, rollback mechanisms would not work effectively, and transactional integrity could be compromised. Why Other Options Are Incorrect :
- SELECT : This is a Data Query Language (DQL) command used for retrieving data, not managing transactions.
- UPDATE : This is a Data Manipulation Language (DML) command used to modify data, not a TCL command.
- ALTER : This is a Data Definition Language (DDL) command used for modifying table structures, unrelated to transactions.
- DROP : Another DDL command, used for deleting database objects, not for controlling transactions.
Select the set of numbers that is similar to the following set:
(23, 7, 24)
Scotland: Golf : : South Korea : ?
- Select the option that is related to the third number in the same way as the second number is related to the first number.
43: 1856 :: 22: ? - If WORD - LUCK = 34, then FAIR - HOPE = ?
CONCEPT : AMLACNR :: COUNTRY :Â ?
Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
_ _ i _ h _ i ...
Select the option that is related to the third number in the same way as the second number is related to first number and the sixth number is related to...
Select the set in which the numbers are related in the same way as are the numbers of the following sets.
(NOTE : Operations should be performe...
How is J related to H?
Select the option that is related to fourth letter-cluster in the same way second letter cluster is related to first letter-cluster.
Maple: Tre...