1. _______ value is used to represent unknown or undefined values.   ZERO   Blank   NULL   Hint Half-n-half Clue   2. If our program generate SQL statements on-the-fly and sends it to the database as a text file, the SQL environment in use is known as _______ SQL.   Dynamic   Real - time   PL   Embedded   Half-n-half Clue   3. What is the POSITION function used for?   To extract the row number of a particular record.   None of the above   To extract the starting position of a string in another string.   Half-n-half Clue   4. Which one of the following operators allow us to concatenate two strings?   &&   &   +   ||   Half-n-half Clue   5. The data type used to store variable length bit strings is _______.   VARBIT(length)   VARBIT2(length)   BIT(length)   BIT VARYING(length)   Half-n-half Clue   6. SQL is platform independent.   True   False   7. What is the data type that is used to store large amounts of formatted text like objects?   NCHAR   CLOB   VARCHAR   VCHAR   Half-n-half Clue