I am not advocating that you use this in a production system, but if you’re looking to re-index all tables in your database (say on development or test), here is a short script for it:
exec sp_msforeachtable 'dbcc dbreindex(''?'', '''', 80)'
Note, the last parameter controls the fill factor, set it to 0 to re-use the last known fill factor or read more about it in Books Online. With sp_msforeachtable you’re looping through all tables in the database and executing the provided script. As you can see above you use a question mark (?) to substitute the table name. This is a decent alternative to manual looping through INFORMATION_SCHEMA.TABLES which is another way to get a list of all tables in your database.
If you were just looking to obtain a dbcc script you can run this command and it will generate the equivalent script that is run by the first command I showed:
select
'dbcc dbreindex(''' + TABLE_NAME + ''', '''', 80)'
from
INFORMATION_SCHEMA.TABLES
where
TABLE_TYPE = 'BASE TABLE'
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