Добавил:

Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.

Вуз:

Уральская государственная архитектурно-художественная академия

Предмет:

[НЕСОРТИРОВАННОЕ]

Файл:

Bazy_dannykh_Uchebnoe_posobie

.pdf

Скачиваний:

Добавлен:

02.05.2015

Размер:

21.47 Mб

Скачать

☆

<<< < Предыдущая 1 2 3 4 5 6 7 8 910 / 2110 11 12 13 14 15 16 17 18 19 20 21 > Следующая >>>

2006	9891.88
2006	4723.00
2008	767.19
,		,
	( .	).

40:

ORDER BY , , GROUP BY . , ORDER BY .

SELECT , , MAX () FROM

GROUP BY , ORDER BY ;

41:

, . , .

SELECT sname, comm

FROM Salespeople

GROUP BY 2 DESC;

, ,

. SQL

42:

, , , .

			48.
SELECT ,	,	,	* 100
FROM		;

----------------------------------------------------------------------------------------------------------

* 100

----------------------------------------------------------------------------------------------------------

1001		12
1002		13
1004		11
1007	.	5
1003		10

43:

			,
		(%).
			49.
SELECT ,	,	,	* 100, '%
FROM		;

----------------------------------------------------------------------------------------------------------

* 100

----------------------------------------------------------------------------------------------------------

1001				12%
1002				13%
1004				11%
1007		.		5%
1003				10%
44:
,				,
			.	.
				50.
SELECT ' ',		, ',	', COUNT (DISTINCT		),
'	.'
FROM
GROUP BY		;

---------------------------------------------------------------------------------------------------------

' ', , ', ' COUNT (DISTINCT ), '.'

----------------------------------------------------------------------------------------------------------

10/03/1990 ,	5
10/04/1990 ,	2
10/05/1990 ,	1
10/06/1990,	2

SQL -

, . - ,

. , , FROM

, .

, , .

. : Salespeople.snum, Salespeople.city, Orders.odate. ,

45:

			51.
SELECT	.	,	.	,	.
FROM	,
WHERE	.	=	.		;

----------------------------------------------------------------------------------------------------------

...

----------------------------------------------------------------------------------------------------------

46:

, ,

			.
	.
			52.
SELECT	.	,	.
FROM	,
WHERE (	.	=	. )

ORDER BY 1 DESC, 2 DESC;

----------------------------------------------------------------------------------------------------------

1900.10

5160.45

18.69

1098.16

1713.23

4723.00

9891.88

75.75

1309.95 767.19

47:

. ,

, , . 53.

SELECT	,	.	,	.	,	.	,
	.	*		.
FROM		,		,
WHERE	.		=			.
AND	.		=	.	;

---------------------------------------------------------------------------------------------------------

	.
.	.
	.	*
	.

---------------------------------------------------------------------------------------------------------

3001	18.69	2,8
3003	767.19	92,06
3002	1900.10	209,01
3005	5160.45	670,86
3006	1098.16	164,72
3009	1713.23	171,32
3007	75.75	9,85
3008	4723.00	613,99
3010	1309.95	170,29
3011	9891.88	117,80

FROM c:

SELECT

FROM < 1> < > JOIN < 2> ON <>;

-	( .	7).
	SQL		INNER JOIN
OUTER JOIN		.	INNER JOIN
,	<	>	(NOT NULL)

AND. OUTER JOIN , ,

OR.

48:

3-, .,

. .

		54.
SELECT
FROM	INNER JOIN
	ON (outer.	= inner. )

----------------------------------------------------------------------------------------------------------

2001		100	1001
2003		200	1002
2008		300	1007
2007	.	100	1004

()

SQL

49:

					.
					.
					55.
SELECT	.	,	.	,	.
FROM				,
WHERE	.		=	.	;

----------------------------------------------------------------------------------------------------------

200

300

100

100 100

, ,

. ,

(

)

, A

B , A B . ,

		,
.		,
,	,	,

. ,

					56.
SELECT	.	,	.	,	.
FROM				,
WHERE	.	=		.
AND	.	<		.	;

----------------------------------------------------------------------------------------------------------

100

200

100

100 300

- - , ,

. ,

		57.
SELECT *
FROM
WHERE	= (SELECT
FROM
WHERE	= '	');

---------------------------------------------------------------------------------------------------------

3002 1900.10 10.03.1990 2007 1004

() , SQL () WHERE. ,

, «»,

. , , = 1004.

SQL , , , = 1004. . ,

, . ,

, (

, ), . ,

WHERE = 1004

DISTICT

50:

. .

	58.
SELECT *
FROM
WHERE	= (SELECT DISTINCT
FROM
WHERE	= 2004);

----------------------------------------------------------------------------------------------------------

3007	75.75	10.04.1990	2004	1002
3010	1309.95	10.06.1990	2004	1002

51:

, , 4-. .

	59.
SELECT *
FROM
WHERE	> (SELECT AVG (	)
FROM
WHERE	= 10/04/1990);

----------------------------------------------------------------------------------------------------------

3002	1900.10	10.03.1990	2007	1004
3005	5160,45	10.03.19990	2003	1002
3006	1098.19	10.03.1990	2008	1007
3009	1713.23	10.04.1990	2002	1003
3008	4723.00	10/05/1990	2006	1001
3010	1309.95	10/06/1990	2004	1002
3011	9891.88	10/06/1990	2006	1001