Mega Code Archive
Create a composite index
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1> CREATE TABLE employee (emp_no INTEGER NOT NULL,
2> emp_fname CHAR(20) NOT NULL,
3> emp_lname CHAR(20) NOT NULL,
4> dept_no CHAR(4) NULL)
5>
6> insert into employee values(1, 'Matthew', 'Smith', 'd3')
7> insert into employee values(2, 'Ann', 'Jones', 'd3')
8> insert into employee values(3, 'John', 'Barrimore','d1')
9> insert into employee values(4, 'James', 'James', 'd2')
10> insert into employee values(5, 'Elsa', 'Bertoni', 'd2')
11> insert into employee values(6, 'Elke', 'Hansel', 'd2')
12> insert into employee values(7, 'Sybill', 'Moser', 'd1')
13>
14> select * from employee
15> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
(1 rows affected)
emp_no emp_fname emp_lname dept_no
----------- -------------------- -------------------- -------
1 Matthew Smith d3
2 Ann Jones d3
3 John Barrimore d1
4 James James d2
5 Elsa Bertoni d2
6 Elke Hansel d2
7 Sybill Moser d1
(7 rows affected)
1>
2> -- Create a composite index: the compound values in both columns must be unique
3>
4> CREATE UNIQUE INDEX i_empno_prno ON employee (emp_no, dept_no)
5> WITH FILLFACTOR=80
6> GO
1>
2> drop index i_empno_prno on employee
3> drop table employee
4> GO
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