Create a composite index: the compound values in both columns must be unique : Create Index « Index « SQL Server / T-SQL

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Create a composite index: the compound values in both columns must be unique

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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