Query two tables with column in common : Table alias « Table « SQL Server / T-SQL Tutorial






4> CREATE TABLE Suppliers (
5>      SupplierID int NOT NULL ,
6>      CompanyName nvarchar (40) NOT NULL ,
7>      ContactName nvarchar (30) NULL ,
8>      ContactTitle nvarchar (30) NULL ,
9>      Address nvarchar (60) NULL ,
10>     City nvarchar (15) NULL ,
11>     Region nvarchar (15) NULL ,
12>     PostalCode nvarchar (10) NULL ,
13>     Country nvarchar (15) NULL ,
14>     Phone nvarchar (24) NULL ,
15>     Fax nvarchar (24) NULL ,
16>     HomePage ntext NULL
17> )
18> GO
1>
2>
3> INSERT Suppliers VALUES(1,'L','N','Manager','L 10','Van',NULL,'2800','Paris','1114108','43844115',NULL)
4> INSERT Suppliers VALUES(2,'Z','D','Manager','V 22','Zaa',NULL,'9999 ZZ','USA',' 1212','(12345) 1210',NULL)
5> INSERT Suppliers VALUES(3,'K','A','Manager','V 12','Lap',NULL,'53120','Finland',' 10956',NULL,NULL)
6> INSERT Suppliers VALUES(4,'G','W','Tester', '1 Hill','Sydney','NSW','2042','Australia','(02) 555-5914','(021) 555-2222',null)
7> INSERT Suppliers VALUES(5,'M','J','Manager','2 St.','Mon','BC','H1J 1C3','Canada','(514) 555-9022',NULL,NULL)
8> INSERT Suppliers VALUES(6,'P','G','Administrator','V 153','Sal',NULL,'84100','Italy','(089) 6547665','(089) 1111111',NULL)
9> INSERT Suppliers VALUES(7,'E','M','Sales','22 Str','Mont',NULL,'71300','France','85.57.00.07',NULL,NULL)
10> INSERT Suppliers VALUES(8,'G','E','Sales','B Ave','Ann',NULL,'74000','France','38.76.98.06','38.76.98.58',NULL)
11> INSERT Suppliers VALUES(9,'F','C','Manager','1 Str','Ste','Calgary','J2S 7S8','Canada','(514) 555-2955','(514) 555-2921',NULL)
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>
2>
3> CREATE TABLE Products (
4>      ProductID int NOT NULL ,
5>      ProductName nvarchar (40) NOT NULL ,
6>      SupplierID int NULL ,
7>      CategoryID int NULL ,
8>      QuantityPerUnit nvarchar (20) NULL ,
9>      UnitPrice money NULL,
10>     UnitsInStock smallint NULL,
11>     UnitsOnOrder smallint NULL,
12>     ReorderLevel smallint NULL,
13>     Discontinued bit NOT NULL
14> )
15> GO
1> INSERT Products VALUES(1,'F',15,4,'10 - 999 g pkgs.',61.5,66,6,6,6)
2> INSERT Products VALUES(2,'M',14,4,'24 - 888 g pkgs.',34.8,74,7,7,7)
3> INSERT Products VALUES(3,'R',17,8,'24 - 777 g jars',17,171,0,5,0)
4> INSERT Products VALUES(4,'L',4,7,'5 kg pkg.',10,4,20,5,0)
5> INSERT Products VALUES(5,'R',12,1,'24 - 0.5 l bottles',1.23,445,0,25,0)
6> INSERT Products VALUES(6,'L',23,1,'500 ml',18,57,1,20,0)
7> INSERT Products VALUES(7,'O',12,2,'12 boxes',13,23,0,15,0)
8> go

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)
1>    SELECT   *
2>    FROM Products, Suppliers
3>    WHERE Products.SupplierID = Suppliers.SupplierID
4> GO
ProductID   ProductName                              SupplierID  CategoryID  QuantityPerUnit      UnitPrice             UnitsInStock UnitsOnOrder ReorderLevel Discontinued SupplierID  CompanyName
                         ContactName                    ContactTitle                   Address                                                      City            Region          PostalCode Country
       Phone                    Fax                      HomePage

----------- ---------------------------------------- ----------- ----------- -------------------- --------------------- ------------ ------------ ------------ ------------ ----------- ----------------
------------------------ ------------------------------ ------------------------------ ------------------------------------------------------------ --------------- --------------- ---------- ---------
------ ------------------------ ------------------------ -----------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------
          4 L                                                  4           7 5 kg pkg.                          10.0000            4           20            5            0           4 G
                         W                              Tester                         1 Hill                                                       Sydney          NSW             2042       Australia
       (02) 555-5914            (021) 555-2222           NULL


(1 rows affected)
1>
2> drop table Products;
3> drop table Suppliers;
4> GO








3.6.Table alias
3.6.1.Reference column with table name
3.6.2.Table alias during table join
3.6.3.Ambiguous column name during table join
3.6.4.Query two tables with column in common
3.6.5.Column name with or without a table alias