Look at the DDL is the easiest way. Go into navigator, double click on the table and investigate the column in the GUI. Alternatively you can right click the table and generate the SQL Script which will create the DDL script and you can tell from that.
In MS SQL there is a stored procedure called "sp_help" which gives table information, I don't think an equivalent exists in DB2. I believe you are forced to utilize the DB2 catalog views to get the same type of information.
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