A script that tests and adjusts credit amounts with a WHILE loop : while « Transact SQL « SQL Server / T-SQL Tutorial

1. SQL Server / T-SQL Tutorial
2. Transact SQL
3. while

16>
17>
18> create table Billings (
19>     BankerID           INTEGER,
20>     BillingNumber      INTEGER,
21>     BillingDate        datetime,
22>     BillingTotal       INTEGER,
23>     TermsID            INTEGER,
24>     BillingDueDate     datetime ,
25>     PaymentTotal       INTEGER,
26>     CreditTotal        INTEGER
27>
28> );
29> GO
1>
2> INSERT INTO Billings VALUES (1, 1, '2005-01-22', 165, 1,'2005-04-22',123,321);
3> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (2, 2, '2001-02-21', 165, 1,'2002-02-22',123,321.);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (3, 3, '2003-05-02', 165, 1,'2005-04-12',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (4, 4, '1999-03-12', 165, 1,'2005-04-18',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (5, 5, '2000-04-23', 165, 1,'2005-04-17',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (6, 6, '2001-06-14', 165, 1,'2005-04-18',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (7, 7, '2002-07-15', 165, 1,'2005-04-19',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (8, 8, '2003-08-16', 165, 1,'2005-04-20',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (9, 9, '2004-09-17', 165, 1,'2005-04-21',123,321);
2> GO

(1 rows affected)
1> INSERT INTO Billings VALUES (0, 0, '2005-10-18', 165, 1,'2005-04-22',123,321);
2> GO

(1 rows affected)
1>
2>
3> WHILE (SELECT SUM(BillingTotal - CreditTotal - PaymentTotal) FROM Billings) >= 50000
4>     BEGIN
5>         UPDATE Billings
6>         SET CreditTotal = CreditTotal + .01
7>         WHERE BillingTotal  - CreditTotal - PaymentTotal > 0
8>         IF (SELECT MAX(CreditTotal) FROM Billings) > 3000
9>             BREAK
10>         ELSE --(SELECT MAX(CreditTotal) FROM Billings) <= 3000
11>             CONTINUE
12>     END
13> GO
1> SELECT BillingDate, BillingTotal, CreditTotal
2> FROM Billings
3> GO
BillingDate             BillingTotal CreditTotal
----------------------- ------------ -----------
2005-01-22 00:00:00.000          165         321
2001-02-21 00:00:00.000          165         321
2003-05-02 00:00:00.000          165         321
1999-03-12 00:00:00.000          165         321
2000-04-23 00:00:00.000          165         321
2001-06-14 00:00:00.000          165         321
2002-07-15 00:00:00.000          165         321
2003-08-16 00:00:00.000          165         321
2004-09-17 00:00:00.000          165         321
2005-10-18 00:00:00.000          165         321

(10 rows affected)
1>
2> drop table Billings;
3> GO