Querying Data with Transact-SQL

The solution does not meet the goal. There are two primary issues with the provided SQL script. First, the column names in the INSERT statement do not match those in the Products table definition; 'ProductPrice' should be 'UnitPrice', and 'ProductsInStock' should be 'UnitsInStock'. Second, there is a missing semicolon terminator after the ROLLBACK TRANSACTION statement in the CATCH block. Correcting these issues is necessary for the script to function as intended. When SET XACT_ABORT is ON, if a runtime error occurs, the entire transaction is terminated and rolled back, which is correct behavior but is overshadowed by the syntax errors.

The solution does not meet the goal. The transaction correctly captures the INSERT INTO Products statement and rolls back if an error occurs, ensuring that the product information is not permanently written to the database if there is a failure. However, the error number 51000 is not explicitly returned because the code checks for @ERROR = 51000 after rolling back the transaction but does not create or trigger an error number 51000. The error handling mechanism needs to be improved to explicitly set and return error number 51000 when a failure occurs.

The solution provided does not explicitly handle transactions to ensure the operations are completed as a single unit of work. While TRY...CATCH blocks handle error reporting, they do not inherently provide transactional control. To ensure the product information is not permanently written to the database if an insert fails, you need to use explicit transaction handling with BEGIN TRANSACTION and ROLLBACK TRANSACTION in case of failure, along with COMMIT TRANSACTION upon successful completion. The absence of these transactional commands means the solution does not fully meet the described requirements.

The solution does not meet the goal because there are two separate INSERT statements. To ensure that both records are inserted or neither record is inserted, a transaction should be used. This can be achieved with BEGIN TRANSACTION, COMMIT, and ROLLBACK statements to group the inserts into a single transactional unit. Without a transaction, if an error occurs in the second INSERT statement, the first one could still be committed, which does not fulfill the requirement of 'both or neither'.

The given solution will not ensure that both records are inserted or neither record is inserted. The solution consists of two separate INSERT INTO statements. If one of the statements fails, the other could still succeed, resulting in only one of the records being inserted. To ensure that both records are inserted or neither record is inserted, the statements must be executed within a single transaction using BEGIN TRANSACTION and COMMIT TRANSACTION. Additionally, you would need to set XACT_ABORT to ON to automatically roll back the transaction if any statement within the transaction fails. Therefore, the solution does not meet the goal.