Delphi. 11



         

. - 2


(Projection)

*                                                              (Join)

*                                                              (Union).

() .

SELECT * FROM country
Country

COUNTRY CURRENCY

=============== ==========

USA Dollar

England Pound

Canada CdnDlr

Switzerland SFranc

Japan Yen

Italy Lira

France FFranc

Germany D-Mark

Australia ADollar

Hong Kong HKDollar

Netherlands Guilder

Belgium BFranc

Austria Schilling

Fiji FDollar

- - SQL . SQL, - - .

SELECT * FROM country

WHERE currency = Dollar Country, Currency = Dollar

: