A SELECT statement that substitutes a different data type : COALESCE « Data Convert Functions « SQL Server / T-SQL Tutorial

Home
SQL Server / T-SQL Tutorial
1.Query
2.Insert Delete Update
3.Table
4.Table Join
5.Data Types
6.Set Operations
7.Constraints
8.Subquery
9.Aggregate Functions
10.Date Functions
11.Math Functions
12.String Functions
13.Data Convert Functions
14.Analytical Functions
15.Sequence Indentity
16.View
17.Index
18.Cursor
19.Database
20.Transact SQL
21.Procedure Function
22.Trigger
23.Transaction
24.XML
25.System Functions
26.System Settings
27.System Tables Views
28.User Role
29.CLR
SQL Server / T-SQL Tutorial » Data Convert Functions » COALESCE 
13.2.5.A SELECT statement that substitutes a different data type
5create table Bankers(
6>    BankerID             Integer,
7>    BankerName           VARCHAR(20),
8>    BankerContactLName   VARCHAR(20),
9>     BankerContactFName   VARCHAR(20),
10>     BankerCity           VARCHAR(20),
11>     BankerState          VARCHAR(20),
12>     BankerZipCode        VARCHAR(20),
13>     BankerPhone          VARCHAR(20)
14>  )
15>  GO
1>
2insert into Bankers values (1'ABC Inc.','Joe','Smith','Vancouver','BC','11111','111-111-1111');
3> GO

(rows affected)
1>
2>
3insert into Bankers values (2'DEF Inc.','Red','Rice', 'New York', 'DE','22222','222-222-2222');
4> GO

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

(rows affected)
1>
2>
3insert into Bankers values (4'QWE Inc.','Git','Black','Regina',   'ER','44444','444-444-4444');
4> GO

(rows affected)
1>
2>
3insert into Bankers values (5'RTY Inc.','Wil','Lee',  'Toronto',  'YU','55555','555-555-5555');
4> GO

(rows affected)
1>
2>
3insert into Bankers values (6'YUI Inc.','Ted','Larry','Calgary',  'TY','66666','666-666-6666');
4> GO

(rows affected)
1>
2>
3insert into Bankers values (7'OIP Inc.','Yam','Act',  'San Franc','FG','77777','777-777-7777');
4> GO

(rows affected)
1>
2>
3insert into Bankers values (8'SAD Inc.','Hit','Eat',  'Orland',   'PO','88888','888-888-8888');
4> GO

(rows affected)
1>
2>
3insert into Bankers values (9'DFG Inc.','Sad','Lee',  'Wisler',   'PL','99999','999-999-9999');
4> GO

(rows affected)
1>
2>
3insert into Bankers values (0'GHJ Inc.','Bit','Lee',  'Ticker',   'MN','00000','000-000-0000');
4> GO

(rows affected)
1>
2>
3>
4create table Billings (
5>     BankerID           INTEGER,
6>     BillingNumber      INTEGER,
7>      BillingDate        datetime,
8>      BillingTotal       INTEGER,
9>      TermsID            INTEGER,
10>      BillingDueDate     datetime ,
11>      PaymentTotal       INTEGER,
12>      CreditTotal        INTEGER
13>
14>  );
15>  GO
1>
2INSERT INTO Billings VALUES (11'2005-01-22', 1651,'2005-04-22',123,321);
3> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (22'2001-02-21', 1651,'2002-02-22',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (33'2003-05-02', 1651,'2005-04-12',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (44'1999-03-12', 1651,'2005-04-18',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (55'2000-04-23', 1651,'2005-04-17',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (66'2001-06-14', 1651,'2005-04-18',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (77'2002-07-15', 1651,'2005-04-19',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (88'2003-08-16', 1651,'2005-04-20',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (99'2004-09-17', 1651,'2005-04-21',123,321);
4> GO

(rows affected)
1>
2>
3INSERT INTO Billings VALUES (00'2005-10-18', 1651,'2005-04-22',123,321);
4> GO

(rows affected)
1>
2>
3>
4SELECT BankerName,
5>     COALESCE(CAST(BillingTotal AS varchar)'No Billings') AS BillingTotal
6FROM Bankers LEFT JOIN Billings
7>     ON Bankers.BankerID = Billings.BankerID
8> ORDER BY BankerName
9> GO
BankerName           BillingTotal
-------------------- ------------------------------
ABC Inc.             165
DEF Inc.             165
DFG Inc.             165
GHJ Inc.             165
HJI Inc.             165
OIP Inc.             165
QWE Inc.             165
RTY Inc.             165
SAD Inc.             165
YUI Inc.             165

(10 rows affected)
1> drop table Billings;
2> GO
1>
13.2.COALESCE
13.2.1.COALESCE is equivalent to a CASE expression that returns the first NOT NULL expression in a list of expressions.
13.2.2.Returning the First Non NULL Value in a List of Expressions
13.2.3.COALESCE() saves quite a lot of IF or CASE decision logic.
13.2.4.A SELECT statement that uses the COALESCE function
13.2.5.A SELECT statement that substitutes a different data type
java2s.com  | Contact Us | Privacy Policy
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.