|
14>
15> CREATE TABLE works_on (emp_no INTEGER NOT NULL,
16> project_no CHAR(4) NOT NULL,
17> job CHAR (15) NULL,
18> enter_date DATETIME NULL)
19>
20> insert into works_on values (1, 'p1', 'analyst', '1997.10.1')
21> insert into works_on values (1, 'p3', 'manager', '1999.1.1')
22> insert into works_on values (2, 'p2', 'clerk', '1998.2.15')
23> insert into works_on values (2, 'p2', NULL, '1998.6.1')
24> insert into works_on values (3, 'p2', NULL, '1997.12.15')
25> insert into works_on values (4, 'p3', 'analyst', '1998.10.15')
26> insert into works_on values (5, 'p1', 'manager', '1998.4.15')
27> insert into works_on values (6, 'p1', NULL, '1998.8.1')
28> insert into works_on values (7, 'p2', 'clerk', '1999.2.1')
29> insert into works_on values (8, 'p3', 'clerk', '1997.11.15')
30> insert into works_on values (7, 'p1', 'clerk', '1998.1.4')
31>
32> select * from works_on
33> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
emp_no project_no job enter_date
----------- ---------- --------------- -----------------------
1 p1 analyst 1997-10-01 00:00:00.000
1 p3 manager 1999-01-01 00:00:00.000
2 p2 clerk 1998-02-15 00:00:00.000
2 p2 NULL 1998-06-01 00:00:00.000
3 p2 NULL 1997-12-15 00:00:00.000
4 p3 analyst 1998-10-15 00:00:00.000
5 p1 manager 1998-04-15 00:00:00.000
6 p1 NULL 1998-08-01 00:00:00.000
7 p2 clerk 1999-02-01 00:00:00.000
8 p3 clerk 1997-11-15 00:00:00.000
7 p1 clerk 1998-01-04 00:00:00.000
(11 rows affected)
1>
2>
3> -- AND Operator
4>
5> CREATE INDEX i_works ON works_on(emp_no, enter_date)
6> GO
1>
2> -- Shows the use of the INDEX hint.
3> SET SHOWPLAN_TEXT ON
4> GO
1> select * from works_on WITH (INDEX(i_works))
2> where job = 'Analyst'
3> and enter_date='12/01/1998'
4> GO
StmtText
---------------------------------------------------------------------------------------------------------------------
select * from works_on WITH (INDEX(i_works))
where job = 'Analyst'
and enter_date='12/01/1998'
(1 rows affected)
StmtText
---------------------------------------------------------------------------------------------------------------------------------------------------
|--Filter(WHERE:([master].[dbo].[works_on].[job]='Analyst'))
|--Nested Loops(Inner Join, OUTER REFERENCES:([Bmk1000]))
|--Index Scan(OBJECT:([master].[dbo].[works_on].[i_works]), WHERE:([master].[dbo].[works_on].[enter_date]='1998-12-01 00:00:00.000'))
|--RID Lookup(OBJECT:([master].[dbo].[works_on]), SEEK:([Bmk1000]=[Bmk1000]) LOOKUP ORDERED FORWARD)
(4 rows affected)
1> SET SHOWPLAN_TEXT OFF
2> GO
1> drop table works_on
2> GO
1>
|