# 匿名块支持自治事务
自治事务可以在匿名块中定义，标识符为PRAGMA AUTONOMOUS_TRANSACTION，其余语法与创建匿名块语法相同，非透明多写场景请参见《参考》中"存储过程 \> 声明语法 \> 匿名块"章节，示例如下。
```
gaussdb=# CREATE TABLE t1(a INT ,B TEXT);
NOTICE:  The 'DISTRIBUTE BY' clause is not specified. Using 'a' as the distribution column by default.
HINT:  Please use 'DISTRIBUTE BY' clause to specify suitable data distribution column.
CREATE TABLE
gaussdb=# START TRANSACTION;
START TRANSACTION
gaussdb=# DECLARE 
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
DBE_OUTPUT.PRINT_LINE('JUST USE CALL.');
INSERT INTO t1 VALUES(1,'YOU ARE SO CUTE,WILL COMMIT!');
END;
/
JUST USE CALL.
ANONYMOUS BLOCK EXECUTE
gaussdb=# INSERT INTO t1 VALUES(1,'YOU WILL ROLLBACK!');
INSERT 0 1
gaussdb=# ROLLBACK;
ROLLBACK
gaussdb=# SELECT * FROM t1;
 a |              b               
---+------------------------------
 1 | YOU ARE SO CUTE,WILL COMMIT!
(1 row)
gaussdb=# DROP TABLE t1;
DROP TABLE
```
上述例子，最后在回滚的事务块前执行包含自治事务的匿名块，直接说明了自治事务的特性，即主事务的回滚不会影响自治事务已经提交的内容。