为何会显示“Incorrect syntax near 'L2'”

为什么会显示“Incorrect syntax near 'L2'.”
create login L2 with password='123',
sp_addsrvrolemember 'L2','dbcreator'
[最优解释]
create login L2 with password='123'
go
 sp_addsrvrolemember 'L2','dbcreator' 
[其他解释]
exec exec