limit-keyword TOP-clause ROWNUM
sub-queries
SQL-Injection
DROP-statement DROP-DATABASE
NULL-values unique-key primary-key constraints
HAVING-clause GROUP-BY-clause aggregate-functions
LCASE-Function ROUND-Function MID-Function FORMAT-Function scalar-functions NOW-Function LEN-Function UCASE-Function
SELECT-clause
sub-queries correlated-subquery synchronized-subquery
Oracle NULL-values General-Functions NVL
