An inner join with correlation names that make the query more difficult to read : Inner join « Table Join « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table Join » Inner join 
4. 3. 3. An inner join with correlation names that make the query more difficult to read
4>
5create table Billings (
6>     BankerID           INTEGER,
7>     BillingNumber      INTEGER,
8>     BillingDate        datetime,
9>     BillingTotal       INTEGER,
10>     TermsID            INTEGER,
11>     BillingDueDate     datetime ,
12>     PaymentTotal       INTEGER,
13>     CreditTotal        INTEGER
14>
15);
16> GO
1>
2INSERT INTO Billings VALUES (11'2005-01-22', 1651,'2005-04-22',123,321);
3> GO

(rows affected)
1INSERT INTO Billings VALUES (22'2001-02-21', 1651,'2002-02-22',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (33'2003-05-02', 1651,'2005-04-12',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (44'1999-03-12', 1651,'2005-04-18',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (55'2000-04-23', 1651,'2005-04-17',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (66'2001-06-14', 1651,'2005-04-18',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (77'2002-07-15', 1651,'2005-04-19',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (88'2003-08-16', 1651,'2005-04-20',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (99'2004-09-17', 1651,'2005-04-21',123,321);
2> GO

(rows affected)
1INSERT INTO Billings VALUES (00'2005-10-18', 1651,'2005-04-22',123,321);
2> GO

(rows affected)
1>
2>
3create table Bankers(
4>    BankerID             Integer,
5>    BankerName           VARCHAR(20),
6>    BankerContactLName   VARCHAR(20),
7>    BankerContactFName   VARCHAR(20),
8>    BankerCity           VARCHAR(20),
9>    BankerState          VARCHAR(20),
10>    BankerZipCode        VARCHAR(20),
11>    BankerPhone          VARCHAR(20)
12)
13> GO
1>
2insert into Bankers values (1'ABC Inc.','Joe','Smith','Vancouver','BC','11111','111-111-1111');
3> GO

(rows affected)
1insert into Bankers values (2'DEF Inc.','Red','Rice', 'New York', 'DE','22222','222-222-2222');
2> GO

(rows affected)
1insert into Bankers values (3'HJI Inc.','Kit','Cat',  'Paris',    'CA','33333','333-333-3333');
2> GO

(rows affected)
1insert into Bankers values (4'QWE Inc.','Git','Black','Regina',   'ER','44444','444-444-4444');
2> GO

(rows affected)
1insert into Bankers values (5'RTY Inc.','Wil','Lee',  'Toronto',  'YU','55555','555-555-5555');
2> GO

(rows affected)
1insert into Bankers values (6'YUI Inc.','Ted','Larry','Calgary',  'TY','66666','666-666-6666');
2> GO

(rows affected)
1insert into Bankers values (7'OIP Inc.','Yam','Act',  'San Franc','FG','77777','777-777-7777');
2> GO

(rows affected)
1insert into Bankers values (8'SAD Inc.','Hit','Eat',  'Orland',   'PO','88888','888-888-8888');
2> GO

(rows affected)
1insert into Bankers values (9'DFG Inc.','Sad','Lee',  'Wisler',   'PL','99999','999-999-9999');
2> GO

(rows affected)
1insert into Bankers values (0'GHJ Inc.','Bit','Lee',  'Ticker',   'MN','00000','000-000-0000');
2> GO

(rows affected)
1>
2>
3>
4SELECT BillingNumber, BankerName, BillingDueDate,
5>     BillingTotal - PaymentTotal - CreditTotal AS BalanceDue
6FROM Bankers AS v JOIN Billings AS i
7>     ON v.BankerID = i.BankerID
8WHERE BillingTotal - PaymentTotal - CreditTotal > 0
9> ORDER BY BillingDueDate DESC
10> GO
BillingNumber BankerName           BillingDueDate          BalanceDue
------------- -------------------- ----------------------- -----------

(rows affected)
1>
2> drop table Bankers;
3> drop table Billings;
4> 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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