SQL-92 Three-Way Inner Joins : Table Join « Table Join « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table Join » Table Join 
4. 1. 13. SQL-92 Three-Way Inner Joins
3>
4CREATE TABLE Departments(
5> Deptno   int         NOT NULL CONSTRAINT PK_dept_deptno PRIMARY KEY,
6> deptname varchar(15NOT NULL
7)
8> GO
1>
2CREATE TABLE Jobs(
3> jobid   int         NOT NULL CONSTRAINT PK_jobs_jobid PRIMARY KEY,
4> jobdesc varchar(15NOT NULL
5)
6> GO
1>
2CREATE TABLE Employees(
3> empid   int         NOT NULL CONSTRAINT PK_emps_empid PRIMARY KEY,
4> empname varchar(10NOT NULL,
5> deptno  int         NULL CONSTRAINT FK_emps_depts REFERENCES Departments(deptno),
6> jobid   int         NOT NULL,
7> salary decimal(7,2NOT NULL
8)
9> GO
1>
2INSERT INTO Departments VALUES(100'Java2sing')
3INSERT INTO Departments VALUES(200'Production')
4INSERT INTO Departments VALUES(300'Marketing')
5INSERT INTO Departments VALUES(400'Management')
6INSERT INTO Jobs VALUES(10'Java2s')
7INSERT INTO Jobs VALUES(20'Oracle')
8INSERT INTO Jobs VALUES(30'MySQL')
9INSERT INTO Jobs VALUES(40'SqlServer')
10INSERT INTO Employees VALUES(1'Joe', 400303456.00)
11INSERT INTO Employees VALUES(2'James', 200204325.00)
12INSERT INTO Employees VALUES(3'Chris', 100108952.00)
13INSERT INTO Employees VALUES(4'Rob', 400301234.00)
14INSERT INTO Employees VALUES(5'Linda', 400304567.00)
15INSERT INTO Employees VALUES(6'Lisa', NULL, 308765.00)
16> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>
3>
4SELECT
5>   empid,
6>   empname,
7>   salary,
8>   E.deptno,
9>   deptname,
10>   E.jobid,
11>   jobdesc
12FROM
13>    Employees  AS E
14>  JOIN
15>   Departments AS D ON E.deptno = D.deptno
16>  JOIN
17>    Jobs       AS J ON E.jobid  = J.jobid
18>
19> drop table Employees
20> drop table jobs
21> drop table Departments
22> GO
empid       empname    salary    deptno      deptname        jobid       jobdesc
----------- ---------- --------- ----------- --------------- ----------- ---------------
          Joe          3456.00         400 Management               30 MySQL
          James          4325.00         200 Production               20 Oracle
          Chris        8952.00         100 Java2sing              10 Java2s
          Rob          1234.00         400 Management               30 MySQL
          Linda        4567.00         400 Management               30 MySQL

(rows affected)
4. 1. Table Join
4. 1. 1. SQL Server 2005 join types fall into three categories: inner, outer, and cross.
4. 1. 2. Selecting authors and titles using only joins.
4. 1. 3. A SELECT statement that joins the Bankers and Billings tables
4. 1. 4. Joining Tables in the WHERE Clause (not ANSI standard)
4. 1. 5. Using the GROUP BY Clause
4. 1. 6. Joining three tables.
4. 1. 7. Joins and Subqueries
4. 1. 8. Left and Right Outer Joins
4. 1. 9. Joining Tables in the FROM Clause (ANSI standard)
4. 1. 10. Table Aliasing
4. 1. 11. Join tables with two columns
4. 1. 12. The result of the previous join is then joined to another table
4. 1. 13. SQL-92 Three-Way Inner Joins
4. 1. 14. Forcing the Order of Join Processing
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