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I need to write a Stored Procedure to compare two Environment's(eg. Dev1_stg with Dev12_stg) Tables, Stored Procedure, UDF, Especially Views. Can any one suggest how can i approach this concept in Stored Procedure? 
I am able to do this comparison for Tables, using Dbc.ColumnsV. but for Stored Procedures, Views?

If you've worked with Oracle for years and now find yourself the DBA for a Teradata Data Warehouse, you'll want to get productive as soon as possible.

have few questions reg substr & substring
a. which one is ANSI compliant?
b. whats th difference btween two?
c. which one should be used?