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

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SQL Server / T-SQL Tutorial » Table » Table alias 
3. 6. 4. Query two tables with column in common
4CREATE TABLE Suppliers (
5>      SupplierID int NOT NULL ,
6>      CompanyName nvarchar (40NOT NULL ,
7>      ContactName nvarchar (30NULL ,
8>      ContactTitle nvarchar (30NULL ,
9>      Address nvarchar (60NULL ,
10>     City nvarchar (15NULL ,
11>     Region nvarchar (15NULL ,
12>     PostalCode nvarchar (10NULL ,
13>     Country nvarchar (15NULL ,
14>     Phone nvarchar (24NULL ,
15>     Fax nvarchar (24NULL ,
16>     HomePage ntext NULL
17)
18> GO
1>
2>
3INSERT Suppliers VALUES(1,'L','N','Manager','10','Van',NULL,'2800','Paris','1114108','43844115',NULL)
4INSERT Suppliers VALUES(2,'Z','D','Manager','22','Zaa',NULL,'9999 ZZ','USA',' 1212','(123451210',NULL)
5INSERT Suppliers VALUES(3,'K','A','Manager','12','Lap',NULL,'53120','Finland',' 10956',NULL,NULL)
6INSERT Suppliers VALUES(4,'G','W','Tester', '1 Hill','Sydney','NSW','2042','Australia','(02555-5914','(021555-2222',null)
7INSERT Suppliers VALUES(5,'M','J','Manager','St.','Mon','BC','H1J 1C3','Canada','(514555-9022',NULL,NULL)
8INSERT Suppliers VALUES(6,'P','G','Administrator','153','Sal',NULL,'84100','Italy','(0896547665','(0891111111',NULL)
9INSERT Suppliers VALUES(7,'E','M','Sales','22 Str','Mont',NULL,'71300','France','85.57.00.07',NULL,NULL)
10INSERT Suppliers VALUES(8,'G','E','Sales','B Ave','Ann',NULL,'74000','France','38.76.98.06','38.76.98.58',NULL)
11INSERT Suppliers VALUES(9,'F','C','Manager','Str','Ste','Calgary','J2S 7S8','Canada','(514555-2955','(514555-2921',NULL)
12> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>
3CREATE TABLE Products (
4>      ProductID int NOT NULL ,
5>      ProductName nvarchar (40NOT NULL ,
6>      SupplierID int NULL ,
7>      CategoryID int NULL ,
8>      QuantityPerUnit nvarchar (20NULL ,
9>      UnitPrice money NULL,
10>     UnitsInStock smallint NULL,
11>     UnitsOnOrder smallint NULL,
12>     ReorderLevel smallint NULL,
13>     Discontinued bit NOT NULL
14)
15> GO
1INSERT Products VALUES(1,'F',15,4,'10 999 g pkgs.',61.5,66,6,6,6)
2INSERT Products VALUES(2,'M',14,4,'24 888 g pkgs.',34.8,74,7,7,7)
3INSERT Products VALUES(3,'R',17,8,'24 777 g jars',17,171,0,5,0)
4INSERT Products VALUES(4,'L',4,7,'5 kg pkg.',10,4,20,5,0)
5INSERT Products VALUES(5,'R',12,1,'24 0.5 l bottles',1.23,445,0,25,0)
6INSERT Products VALUES(6,'L',23,1,'50ml',18,57,1,20,0)
7INSERT Products VALUES(7,'O',12,2,'12 boxes',13,23,0,15,0)
8> go

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(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

----------- ---------------------------------------- ----------- ----------- -------------------- --------------------- ------------ ------------ ------------ ------------ ----------- ----------------
------------------------ ------------------------------ ------------------------------ ------------------------------------------------------------ --------------- --------------- ---------- ---------
------ ------------------------ ------------------------ -----------------------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------
          L                                                  4           7 5 kg pkg.                          10.0000            4           20            5            0           4 G
                         W                              Tester                         Hill                                                       Sydney          NSW             2042       Australia
       (02555-5914            (021555-2222           NULL


(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
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