add files on asset based lending, postgres features, and price mix vol formulas

asset_based_lending.md

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+FCC - fixed charge coverage ratio - looks at cash flow as compared to cash require dto fulfill debt payments
+SLR - senior debt leverage ratio - senior debt to ebitda

postgres_features.md

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+Version 10 Features
+===================
+
+Auto Logging [blog](http://databasedoings.blogspot.com/2017/07/cool-stuff-in-postgresql-10-auto-logging.html)
+
+Transition Tables [blog](http://databasedoings.blogspot.com/2017/07/cool-stuff-in-postgresql-10-transition.html)
+
+Correlated Columns Query Plan [blog](https://blog.2ndquadrant.com/pg-phriday-crazy-correlated-column-crusade/)
+
+Native Partitioning
+
+Logical Replication
+
+Add a version of jsonb's delete operator that takes an array of keys to delete (Magnus Hagander)
+
+Make json_populate_record() and related functions process JSON arrays and objects recursively (Nikita Glukhov)
+
+Identity Columns [blog](https://blog.2ndquadrant.com/postgresql-10-identity-columns/)
+
+Add view pg_hba_file_rules to display the contents of pg_hba.conf (Haribabu Kommi)
+
+Add XMLTABLE function that converts XML-formatted data into a row set (Pavel Stehule, Álvaro Herrera)
+
+
+Security
+===================
+
+LDAP & Active Directory [blog](https://www.openscg.com/2017/07/setting-up-ldap-with-active-directory-in-postgresql/)
+
+Add SCRAM-SHA-256 support for password negotiation and storage (Michael Paquier, Heikki Linnakangas)

price_mix_vol.md

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+
+Only applies to items that exist in both sets of data
+
+**Change in Price**
+
+    ( P₂ - P₁ ) Q₂
+
+**Change in Quantity**
+
+    ( Q₂ - Q₁ ) P₁
+
+_To further break out change in quantity_
+
+
+Change in Quantity - _Volume Related_
+
+    Q₂ ( Q₁ / Σ ( Q₁ ) ) - Q₁
+
+Change in Quantity - _Mix Related_
+
+    Q₂ - Q₂ ( Q₁ / Σ ( Q₁ ) )