, . . ' - Access .
(. index) , . , , . , , , . , , , .
[1] .[2] , upper(last_name) , last_name . , . , . []
1
2
3
4
5
6
[]
: . . , [3]. , , . , , .
. B*-, B+-, B- .
, , . , , , . ( ).
, , , , . , . , . , .
|
|
, . . , , , . , , , .
[]
, . SQL: SELECT first_name FROM people WHERE last_name = '';. last_name ( , NATURAL). B-, . , .
: SELECT email_address FROM customers WHERE email_address LIKE '%@yahoo.com';. , - @yahoo.com, email_address , . , , / . B-. reverse(email_address) : select email_address from customers where reverse(email_address) like reverse('%@yahoo.com');. (moc.oohay@%), reverse(email_address).
(. sparse index) .[4] , , . . . . , . , . .