Use Count function in a left join : Table Join « Table Joins « SQL Server / T-SQL

Home
SQL Server / T-SQL
1.Aggregate Functions
2.Analytical Functions
3.Constraints
4.Cursor
5.Data Set
6.Data Type
7.Database
8.Date Timezone
9.Index
10.Insert Delete Update
11.Math Functions
12.Select Query
13.Sequence
14.Store Procedure Function
15.String Functions
16.Subquery
17.System
18.Table
19.Table Joins
20.Transact SQL
21.Transaction
22.Trigger
23.View
24.XML
SQL Server / T-SQL » Table Joins » Table Join 
Use Count function in a left join


1>
2create table employee(
3>     ID          int,
4>     name        nvarchar (10),
5>     salary      int )
6> GO
1>
2create table job(
3>     ID              int,
4>     title nvarchar  (10),
5>     averageSalary   int)
6> GO
1>
2>
3insert into employee (ID, name, salaryvalues (1,  'Jason', 1234)
4> GO
1insert into employee (ID, name, salaryvalues (2,  'Robert', 4321)
2> GO
1insert into employee (ID, name, salaryvalues (3,  'Celia', 5432)
2> GO
1insert into employee (ID, name, salaryvalues (4,  'Linda', 3456)
2> GO
1insert into employee (ID, name, salaryvalues (5,  'David', 7654)
2> GO
1insert into employee (ID, name, salaryvalues (6,  'James', 4567)
2> GO
1insert into employee (ID, name, salaryvalues (7,  'Alison', 8744)
2> GO
1insert into employee (ID, name, salaryvalues (8,  'Chris', 9875)
2> GO
1insert into employee (ID, name, salaryvalues (9,  'Mary', 2345)
2> GO
1>
2insert into job(ID, title, averageSalaryvalues(1,'Developer',3000)
3> GO
1insert into job(ID, title, averageSalaryvalues(2,'Tester', 4000)
2> GO
1insert into job(ID, title, averageSalaryvalues(3,'Designer', 5000)
2> GO
1insert into job(ID, title, averageSalaryvalues(4,'Programmer', 6000)
2> GO
1>
2>
3select from employee;
4> GO
ID          name       salary
----------- ---------- -----------
          Jason             1234
          Robert            4321
          Celia             5432
          Linda             3456
          David             7654
          James             4567
          Alison            8744
          Chris             9875
          Mary              2345
1select from job;
2> GO
ID          title      averageSalary
----------- ---------- -------------
          Developer           3000
          Tester              4000
          Designer            5000
          Programmer          6000
1>
2SELECT count(e.id), j.title
3FROM Employee e LEFT JOIN job j
4> ON e.ID = j.ID
5> group by j.title
6> ORDER BY j.title
7> GO
            title
----------- ----------
          NULL
          Designer
          Developer
          Programmer
          Tester
1>
2>
3>
4> drop table employee;
5> drop table job;
6> GO
1>
2>
           
       
Related examples in the same category
1.Joining a Table with Itself
2.SQL Server join syntax
3.SET SHOWPLAN_TEXT ON for a table join
4.Joins are advantageous over subqueries if the SELECT list in a query contains columns from more than one table
5.Table join with data returned from function
6.NOT EXISTS function with table join
7.Select columns from all tables
8.Column alias in table join
9.Using TOP in table join
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.