AND 

Combines two Boolean expressions and returns TRUE when both expressions are TRUE. 

FROM 

Specifies the classes that contain the properties listed in a SELECT statement. 

NOT 

Comparison operator used with NULL. 

OR 

Combines two conditions. When more than one logical operator is used in a statement, OR operators are evaluated after AND operators. 

SELECT 

Specifies the properties that will be used in a query. 

WHERE 

Narrows the scope of a query.