SQL Server to Teradata migration - sql-server

Question

We are migrating from SQL Server to Teradata database. All the views and tables are migrated. But the issue is that we aren't able to take the comments from each table.
In SQL Server we have a function called extended property which if used will get the comments from the respective tables/views. Badhri helped with providing a query for fetching the comment in Teradata in the same way but it doesn’t work in the expected way.
I tried inserting sample comments in columns and the below query is not fetching exact results. Can you please help?
Sample Query:
COMMENT ON COLUMN UtilityApp_DB.SQL_Views_Columns.ColumnNAME 'A Columnname for SQL Server!';
select 'COMMENT ON COLUMN '||trim(b.databasename)||'.'||trim(b.tablename) ||'.'||trim(b.columnname)||' IS '||''''||trim(b.commentstring)||''';'
FROM DBC.Columns b
WHERE b.CommentString IS NOT NULL
AND DatabaseName='UtilityApp_DB'
AND TableName in ('UtilityApp_DB.SQL_Views_Columns');
I created a table and tried inserting the values for the comment string in the table by copying the DBC Columns structure but still I can't get the comment string.
insert into UtilityApp_DB.commentstable (commentstring) values ('UtilityApp_DB.SQL_Views_Columns');

Answer 1

TableName in DBC.Columns does not include the database name and IS in your string concatenation should be AS.
SELECT 'COMMENT ON COLUMN '||trim(b.databasename)||'.'||trim(b.tablename) ||'.'||trim(b.columnname)||' AS '||''''||trim(b.commentstring)||''';'
FROM DBC.Columns
WHERE DatabaseName = 'UtilityApp_DB'
AND TableName IN ('SQL_Views_Columns');