EXECUTE 'UPDATE ' || quote_ident(table_name) || ' a'
|| ' SET x_migrate = CASE'
|| ' WHEN BTRIM(desired_not_migrate) = ''TRUE'' THEN FALSE'
+ || ' WHEN BTRIM(desired_not_migrate) = ''DNM'' THEN FALSE'
|| ' WHEN BTRIM(desired_not_migrate) = ''FALSE'' THEN TRUE'
+ || ' WHEN BTRIM(desired_not_migrate) = ''Migrate'' THEN TRUE'
|| ' WHEN BTRIM(desired_not_migrate) = '''' THEN TRUE'
|| ' END';