Show Join hints for INNER HASH JOIN : SHOWPLAN_TEXT « System Settings « SQL Server / T-SQL Tutorial






4>
5> CREATE TABLE employee(
6>    id          INTEGER NOT NULL PRIMARY KEY,
7>    first_name  VARCHAR(10),
8>    last_name   VARCHAR(10),
9>    salary      DECIMAL(10,2),
10>    start_Date  DATETIME,
11>    region      VARCHAR(10),
12>    city        VARCHAR(20)
13> );
14> GO
1> INSERT INTO employee VALUES (1, 'Jason' ,  'Martin', 5890,'2005-03-22','North','Vancouver');
2> INSERT INTO employee VALUES (2, 'Alison',  'Mathews',4789,'2003-07-21','South','Utown');
3> INSERT INTO employee VALUES (3, 'James' ,  'Smith',  6678,'2001-12-01','North','Paris');
4> INSERT INTO employee VALUES (4, 'Celia' ,  'Rice',   5567,'2006-03-03','South','London');
5> INSERT INTO employee VALUES (5, 'Robert',  'Black',  4467,'2004-07-02','East','Newton');
6> INSERT INTO employee VALUES (6, 'Linda' ,  'Green' , 6456,'2002-05-19','East','Calgary');
7> INSERT INTO employee VALUES (7, 'David' ,  'Larry',  5345,'2008-03-18','West','New York');
8> INSERT INTO employee VALUES (8, 'James' ,  'Cat',    4234,'2007-07-17','West','Regina');
9> INSERT INTO employee VALUES (9, 'Joan'  ,  'Act',    6123,'2001-04-16','North','Toronto');
10> 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> select * from employee;
2> GO
id          first_name last_name  salary       start_Date              region     city
----------- ---------- ---------- ------------ ----------------------- ---------- --------------------
          1 Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver
          2 Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown
          3 James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris
          4 Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London
          5 Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton
          6 Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary
          7 David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York
          8 James      Cat             4234.00 2007-07-17 00:00:00.000 West       Regina
          9 Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto

(9 rows affected)
1>
2> CREATE TABLE title(
3>    id  INTEGER,
4>    job_title VARCHAR(20)
5> );
6> GO
1> INSERT INTO title VALUES (1, 'developer');
2> INSERT INTO title VALUES (1, 'manager');
3> INSERT INTO title VALUES (2, 'tester');
4> INSERT INTO title VALUES (2, 'programmer');
5> INSERT INTO title VALUES (3, 'boss');
6> INSERT INTO title VALUES (4, 'sales');
7> INSERT INTO title VALUES (5, 'market');
8> INSERT INTO title VALUES (6, 'coder');
9> INSERT INTO title VALUES (7, 'tester');
10> INSERT INTO title VALUES (8, 'developer');
11> INSERT INTO title VALUES (9, 'manager');
12> 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)
1>
2>
3> SET SHOWPLAN_TEXT ON
4> GO
1> SELECT p.first_Name
2> FROM employee p
3> INNER HASH JOIN title r ON
4> r.ID = p.ID
5> GO
Warning: The join order has been enforced because a local join hint is used.
StmtText
--------------------------------------------------------------------------------
SELECT p.first_Name
FROM employee p
INNER HASH JOIN title r ON
r.ID = p.ID

(1 rows affected)
StmtText

------------------------------------------------------------------------------------------------------------------------
-------------------------------
  |--Hash Match(Inner Join, HASH:([p].[id])=([r].[id]), RESIDUAL:([master].[dbo].[employee].[id] as [p].[id]=[master].[d
bo].[title].[id] as [r].[id]))
       |--Clustered Index Scan(OBJECT:([master].[dbo].[employee].[PK__employee__03DB89B3] AS [p]))

       |--Table Scan(OBJECT:([master].[dbo].[title] AS [r]))


(3 rows affected)
1>
2>
3> SET SHOWPLAN_TEXT OFF
4> GO
1>
2>
3>
4> drop table employee;
5> drop table title;
6> GO
1>








26.34.SHOWPLAN_TEXT
26.34.1.Using Join Hints
26.34.2.Show Join hints for INNER HASH JOIN