Temporary Tables

If you want the data to persist through transaction commits, use the ON COMMIT PRESERVE ROWS option when you create global temporary tables or declare local temporary tables.

There are three types of Temporary Tables:

# tables
```
CREATE TABLE #temp_table( col1 int )
```
Local Temporary Tables
```
DECLARE LOCAL TEMPORARY TABLE temp_table ( col1 int )
```
Local Temporary Tables behave just like # tables
Global Temporary Tables
```
CREATE GLOBAL TEMPORARY TABLE temp_table ( col1 int )
```
Global Temporary Table structure is static across connections and reboots

Normal hash (#) tables do not need the ON COMMIT PRESERVE ROWS option because the data in a hash table will always persist through transaction commits.