数据库系统管理员按照事务的方式执行下面的语句：
Create table tab1 (a int,b int)
insert into tabl values(1,2)
insert into tab1 values(2,3)
commit
Insert into tab1 values(2,3)
Insert into tab1 values(1,6)
Commit
Delete from tab1 where a=1
Insert into tab1 values(1,7)
Delete fro
数据库系统管理员按照事务的方式执行下面的语句：
Create table tab1 (a int,b int)
insert into tabl values(1,2)
insert into tab1 values(2,3)
commit
Insert into tab1 values(2,3)
Insert into tab1 values(1,6)
Commit
Delete from tab1 where a=1
Insert into tab1 values(1,7)
Delete from tab1 where a=1
Insert into tab1 values(1,8)
数据库系统突然崩溃，系统重新启动后，该管理员执行
Select count(*) from tab1
数据库系统的输出是多少?
