BEGIN TRANSACTION : TRANSACTION « Transaction « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Transaction » TRANSACTION 
23. 1. 4. BEGIN TRANSACTION
4> IF EXISTS (SELECT FROM sysobjects WHERE name='show_error' AND
5>     type='U')
6>     DROP TABLE show_error
7> GO
1>
2CREATE TABLE show_error
3(
4> col1    smallint NOT NULL PRIMARY KEY,
5> col2    smallint NOT NULL
6)
7> GO
1>
2>
3BEGIN TRANSACTION
4>
5INSERT show_error VALUES (11)
6INSERT show_error VALUES (12)
7INSERT show_error VALUES (22)
8>
9> COMMIT TRANSACTION
10> GO

(rows affected)
Msg 2627, Level 14, State 1, Server J\SQLEXPRESS, Line 6
Violation of PRIMARY KEY constraint 'PK__show_error__74450BBF'. Cannot insert duplicate key in object 'dbo.show_error'.
The statement has been terminated.

(rows affected)
1>
2SELECT FROM show_error
3> GO
col1   col2
------ ------
     1      1
     2      2

(rows affected)
1>
2> drop table show_error;
3> GO
23. 1. TRANSACTION
23. 1. 1. A transaction is bound by the ACID test. ACID stands for Atomicity, Consistency, Isolation (or Independence), and Durability:
23. 1. 2. Explicit Transaction Commands
23. 1. 3. Using Transactions
23. 1. 4. BEGIN TRANSACTION
23. 1. 5. Using Explicit Transactions
23. 1. 6. Forcing an exclusive table lock.
23. 1. 7. Transaction spread across batches:
23. 1. 8. Exception before transaction committing
23. 1. 9. statements coded as a transaction
23. 1. 10. A script with nested transactions
23. 1. 11. One batch that contains two transactions
23. 1. 12. What happens with stored proc transactions and exceptions?
23. 1. 13. Declare variable in a transaction
23. 1. 14. Inserting a Row into MyTable and Rolling Back the Transaction
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