EXEC SQL DECLARE TABLE statement which gives the layout of the table in terms of DB2 data type.
A host language copy book that gives the host variable definitions for the column name.
In IBM Db2, a DCLMGEN is not a standard or commonly recognized term. It’s possible that there might be a typo or misunderstanding in the question.
If you are referring to a specific term or concept related to Db2, please provide more context or double-check the term. If you have a different question about Db2, feel free to ask, and I’ll do my best to assist you.