1.      Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables?

Data Definition Language (DDL)


2.      What operator performs pattern matching?

LIKE operator


3.      What operator tests column for the absence of data?

IS NULL operator


4.      Which command executes the contents of a specified file?

             START <filename> or @<filename>


5.      What is the parameter substitution symbol used with INSERT INTO command?



6.      Which command displays the SQL command in the SQL buffer, and then executes it?