If a macro object contains multiple actions, the object is referred to as a Macro Group

Answer the following statements true (T) or false (F)

1) In Oracle, character values are enclosed in single quotation marks, but date and number values are not. 2) In Oracle9i, the default display format for date is DD-MM-YYYY. 3) A null value is not defined or not known. 4) The UPDATE statement without the WHERE clause can update all rows in the table. 5) A column alias is enclosed in double quotation marks to display a column name inuppercase only.

The term _______ refers to a technique in which a process can do nothing until it gets permission to enter its critical section but continues to execute an instruction or set of instructions that tests the appropriate variable to gain entrance.

A) spin waiting B) general semaphore C) critical resource D) message passing