In addition to the the Commonwealth Ensign, there are three other official Australian ensigns: 1  The Australian Red Ensign - Merchant Navy, as for the Australian flag, but with a red field with white stars. 2  The Australian White Ensign - Royal Australian Navy - as for the Australian flag but with a white field and dark blue stars.
Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL Null serves to fulfil the requirement that all true relational database management systems (RDBMS) support a representation of missing information and inapplicable information.
Microsoft Access VBA Tip: Use the NZ() NullToZero Function to Handle Null Values. Behavior of Null Values in Equations (Expressions) Any arithmetic calculation in VBA with a Null value results in a null value. If one of the values is NULL, the result is Null (blank).