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.
(validate the data, if its not numeric or less than spaces then move spaces into it and then insert or update into table) 2) A table column is defined as NULL, The host variable has a not null value and the Null indicator is not set in the host program, so the null indicator is defaulted to a negative value.f the column is set to NULL, then the indicator field is used to record this. Using NULL will never save space in a DB2 database design-in fact, it will always add an extra byte for every column that can be.