Advanced Query Tool can show you a lot more information about a table than the column list. 
If you right-click a table you will get a menu showing what other information can be displayed (these will be shown in the right-most grid). 

This feature of the product is customizable: the options that appear in this menu, and the queries that are run when an option is selected, is specified in a config file. You can amend these queries, or add your own, by amending this config file. This gives AQT an impressive degree of customizability. 

Note: this example is for DB2/UDB. For other databases the information will be slightly different.

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