Mega Code Archive
NOT EXISTS function
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1>
2> CREATE TABLE employee (emp_no INTEGER NOT NULL,
3> emp_fname CHAR(20) NOT NULL,
4> emp_lname CHAR(20) NOT NULL,
5> dept_no CHAR(4) NULL)
6>
7> insert into employee values(1, 'Matthew', 'Smith', 'd3')
8> insert into employee values(2, 'Ann', 'Jones', 'd3')
9> insert into employee values(3, 'John', 'Barrimore','d1')
10> insert into employee values(4, 'James', 'James', 'd2')
11> insert into employee values(5, 'Elsa', 'Bertoni', 'd2')
12> insert into employee values(6, 'Elke', 'Hansel', 'd2')
13> insert into employee values(7, 'Sybill', 'Moser', 'd1')
14>
15> select * from employee
16> 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>
3> CREATE TABLE department(dept_no CHAR(4) NOT NULL,
4> dept_name CHAR(25) NOT NULL,
5> location CHAR(30) NULL)
6>
7> insert into department values ('d1', 'developer', 'Dallas')
8> insert into department values ('d2', 'tester', 'Seattle')
9> insert into department values ('d3', 'marketing', 'Dallas')
10>
11> select * from department
12> GO
(1 rows affected)
(1 rows affected)
(1 rows affected)
dept_no dept_name location
------- ------------------------- ------------------------------
d1 developer Dallas
d2 tester Seattle
d3 marketing Dallas
(3 rows affected)
1>
2> -- NOT EXISTS function.
3>
4> SELECT emp_lname FROM employee WHERE NOT EXISTS
5> (SELECT * FROM department WHERE employee.dept_no = department.dept_no
6> AND location = 'Seattle')
7> GO
emp_lname
--------------------
Smith
Jones
Barrimore
Moser
(4 rows affected)
1>
2> drop table employee
3> drop table department
4> GO
1>
2>
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