MySQL Oracle SQL-server MS-Access DROP-INDEX DB2 DROP-statement
HAVING-clause COUNT-Function aggregate-functions
INSERT-statement
constraints CHECK-constraint
CASE-Function
sub-queries
NULL-values unique-key primary-key constraints
join cross-join inner-join
WHERE-clause DELETE-statement
order-of-operations SELECT-clause ORDER-BY-clause FROM-clause queries GROUP-BY-clause HAVING-clause WHERE-clause