Once you decide to alias a table, you must use that alias in every part of the query. : Inner join « Table Join « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table Join » Inner join 
4. 3. 7. Once you decide to alias a table, you must use that alias in every part of the query.
4>
5>
6CREATE TABLE Products (
7>      ProductID int NOT NULL ,
8>      ProductName nvarchar (40NOT NULL ,
9>      SupplierID int NULL ,
10>     CategoryID int NULL ,
11>     QuantityPerUnit nvarchar (20NULL ,
12>     UnitPrice money NULL,
13>     UnitsInStock smallint NULL,
14>     UnitsOnOrder smallint NULL,
15>     ReorderLevel smallint NULL,
16>     Discontinued bit NOT NULL
17)
18> 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>
2CREATE TABLE Suppliers (
3>      SupplierID int NOT NULL ,
4>      CompanyName nvarchar (40NOT NULL ,
5>      ContactName nvarchar (30NULL ,
6>      ContactTitle nvarchar (30NULL ,
7>      Address nvarchar (60NULL ,
8>      City nvarchar (15NULL ,
9>      Region nvarchar (15NULL ,
10>     PostalCode nvarchar (10NULL ,
11>     Country nvarchar (15NULL ,
12>     Phone nvarchar (24NULL ,
13>     Fax nvarchar (24NULL ,
14>     HomePage ntext NULL
15)
16> 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>
3>
4>    SELECT p.*, Suppliers.SupplierID
5>    FROM Products p
6>    INNER JOIN Suppliers s
7>            ON p.SupplierID = s.SupplierID
8> GO
Msg 4104, Level 16, State 1, Server J\SQLEXPRESS, Line 4
The multi-part identifier "Suppliers.SupplierID" could not be bound.
1>
2> drop table Products;
3> GO
1>
2> drop table Suppliers;
3> GO
4. 3. Inner join
4. 3. 1. The explicit syntax for an inner join
4. 3. 2. The syntax for an inner join that uses correlation names
4. 3. 3. An inner join with correlation names that make the query more difficult to read
4. 3. 4. Select distinct value from inner join
4. 3. 5. Inner join two table with column in common
4. 3. 6. Inner join with where clause
4. 3. 7. Once you decide to alias a table, you must use that alias in every part of the query.
4. 3. 8. works with the qualified * operator
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