EXISTS function can be used to represent the ANY and ALL operators : EXISTS « Select Query « SQL Server / T-SQL

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SQL Server / T-SQL » Select Query » EXISTS 
EXISTS function can be used to represent the ANY and ALL operators

35>
36>
37>
38CREATE TABLE employee  (emp_no    INTEGER NOT NULL,
39>                         emp_fname CHAR(20NOT NULL,
40>                         emp_lname CHAR(20NOT NULL,
41>                         dept_no   CHAR(4NULL)
42>
43insert into employee values(1,  'Matthew', 'Smith',    'd3')
44insert into employee values(2,  'Ann',     'Jones',    'd3')
45insert into employee values(3,  'John',    'Barrimore','d1')
46insert into employee values(4,  'James',   'James',    'd2')
47insert into employee values(5,  'Elsa',    'Bertoni',  'd2')
48insert into employee values(6,  'Elke',    'Hansel',   'd2')
49insert into employee values(7,  'Sybill',  'Moser',    'd1')
50>
51select from employee
52> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
emp_no      emp_fname            emp_lname            dept_no
----------- -------------------- -------------------- -------
          Matthew              Smith                d3
          Ann                  Jones                d3
          John                 Barrimore            d1
          James                James                d2
          Elsa                 Bertoni              d2
          Elke                 Hansel               d2
          Sybill               Moser                d1

(rows affected)
1>
2>
3CREATE TABLE department(dept_no   CHAR(4NOT NULL,
4>                         dept_name CHAR(25NOT NULL,
5>                         location  CHAR(30NULL)
6>
7insert into department values ('d1', 'developer',   'Dallas')
8insert into department values ('d2', 'tester',      'Seattle')
9insert into department values ('d3', 'marketing',  'Dallas')
10>
11select from department
12> GO

(rows affected)

(rows affected)

(rows affected)
dept_no dept_name                 location
------- ------------------------- ------------------------------
d1      developer                 Dallas
d2      tester                    Seattle
d3      marketing                 Dallas

(rows affected)
1>
2CREATE TABLE works_on        (emp_no       INTEGER NOT NULL,
3>                         project_no    CHAR(4NOT NULL,
4>                         job CHAR (15NULL,
5>                         enter_date    DATETIME NULL)
6>
7insert into works_on values (1'p1', 'analyst', '1997.10.1')
8insert into works_on values (1'p3', 'manager', '1999.1.1')
9insert into works_on values (2'p2', 'clerk',   '1998.2.15')
10insert into works_on values (2'p2',  NULL,     '1998.6.1')
11insert into works_on values (3'p2',  NULL,     '1997.12.15')
12insert into works_on values (4'p3', 'analyst', '1998.10.15')
13insert into works_on values (5'p1', 'manager', '1998.4.15')
14insert into works_on values (6'p1',  NULL,     '1998.8.1')
15insert into works_on values (7'p2', 'clerk',   '1999.2.1')
16insert into works_on values (8'p3', 'clerk',   '1997.11.15')
17insert into works_on values (7'p1', 'clerk',   '1998.1.4')
18>
19select from works_on
20> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
emp_no      project_no job             enter_date
----------- ---------- --------------- -----------------------
          p1         analyst         1997-10-01 00:00:00.000
          p3         manager         1999-01-01 00:00:00.000
          p2         clerk           1998-02-15 00:00:00.000
          p2         NULL            1998-06-01 00:00:00.000
          p2         NULL            1997-12-15 00:00:00.000
          p3         analyst         1998-10-15 00:00:00.000
          p1         manager         1998-04-15 00:00:00.000
          p1         NULL            1998-08-01 00:00:00.000
          p2         clerk           1999-02-01 00:00:00.000
          p3         clerk           1997-11-15 00:00:00.000
          p1         clerk           1998-01-04 00:00:00.000

(11 rows affected)
1> -- EXISTS function can be used to represent the ANY and ALL operators
2>
3SELECT emp_fname, emp_lname FROM employee WHERE EXISTS
4>        (SELECT *  FROM works_on WHERE project_no = 'p1'
5>          AND employee.emp_no = works_on.emp_no)
6> GO
emp_fname            emp_lname
-------------------- --------------------
Matthew              Smith
Elsa                 Bertoni
Elke                 Hansel
Sybill               Moser

(rows affected)
1>
2> drop table department
3> drop table employee
4> drop table works_on
5> GO
1>
2>

           
       
Related examples in the same category
1. NOT EXISTS function
2. Use NOT EXISTS to represent the ALL operator
3. Checks for existing Product record
4. Using EXISTS Operator for a subquery
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