. |
. .
. , Y.
2) SELECT, ( , WHERE). . . (DISTINCT).
: SELECT LastName AS Family, FirstName AS Name FROM Persons -
SELECT LastName, FirstName FROM Persons AS Employees – Employees
: SELECT column FROM table WHERE column operator value
SELECT column FROM table WHERE column operator value;
SELECT * FROM Persons WHERE LastName IN ('Hansen','Pettersen');
SELECT * FROM Persons WHERE City='Sandnes‘
SELECT : SELECT DISTINCT column_name(s) FROM table_name; -
( )
SELECT Employees.Name, Orders.Product
FROM Employees, Orders
WHERE Employees.Employee_ID=Orders.Employee_ID;
– INNER JOIN
SELECT Employees.Name, Orders.Product FROM Employees
INNER JOIN Orders ON
Employees.Employee_ID=Orders.Employee_ID ;
3) , (, "") .
2 : - - , . . – « » . II , . . , . . . , . . .
. . ,
́ (. ) — , . , . ; « IBM», 1928 . — 12 80 , 7⅜ × 3¾ (187,325 × 82,55 ), 0,007 (0,178 ). , 1964 . — (, ).
, 20—50- XX- , . , 70- — 80-, . , .
— , , (. . , ). , , . IBM 305 RAMAC - - .
50- XX . IBM (). 1954 . (1906-1998). 1986 (). Telex 60 .. , IBM. . Bryant Computer, – 1 90
" ":
1 - . .
2 -
...
43 - .
44 - - . .
45 - .
| : |