Use of Functions in Sql statement Concatenation and EXEC : EXEC « Store Procedure Function « SQL Server / T-SQL

1. SQL Server / T-SQL
2. Store Procedure Function
3. EXEC

Use of Functions in Sql statement Concatenation and EXEC

 


6> CREATE TABLE Customers (
7>      CustomerID nchar (5) NOT NULL ,
8>      CompanyName nvarchar (40) NOT NULL ,
9>      ContactName nvarchar (30) NULL ,
10>     ContactTitle nvarchar (30) NULL ,
11>     Address nvarchar (60) NULL ,
12>     City nvarchar (15) NULL ,
13>     Region nvarchar (15) NULL ,
14>     PostalCode nvarchar (10) NULL ,
15>     Country nvarchar (15) NULL ,
16>     Phone nvarchar (24) NULL ,
17>     Fax nvarchar (24) NULL
18> )
19> GO
1>
2> INSERT Customers VALUES('1','A','Maria',    'Sales',  'Str. 57', 'Berlin'    ,NULL,'12209', 'Germany','111-1111111','111-1111111')
3> INSERT Customers VALUES('2','M','Joe',      'Owner',  'Ave. 231','Vancouver' ,NULL,'05023', 'Mexico', '(222) 222-3332',NULL)
4> INSERT Customers VALUES('3','H','Thomas',   'Sales',  'Sq.  111','London'    ,NULL,'1D00P', 'UK',     '(444) 444-4444','(444) 444-4444')
5> INSERT Customers VALUES('4','B','Berg',     'Order',  'Blv    8','Toronto'   ,NULL,'00222', 'Sweden', '4444-55 55 65','5555-55 55 55')
6> INSERT Customers VALUES('5','S','Moos',     'Sales',  'Fort  57','New York'  ,NULL,'68306', 'Germany','6666-66666','6666-77777')
7> INSERT Customers VALUES('6','F','Cite',     'Manager','24      ','Dalles'    ,NULL,'67000', 'France', '88.60.15.31','88.60.15.32')
8> INSERT Customers VALUES('7','C','Sommer',   'Owner',  'Araq, 67','Paris'     ,NULL,'28023', 'Spain',  '(91) 555 22 82','(91) 555 91 99')
9> INSERT Customers VALUES('8','P','Leb',      'Owner',  '12      ','Beijing'   ,NULL,'13008', 'France', '91.24.45.40','91.24.45.41')
10> INSERT Customers VALUES('9','D','Elizabeth','Manager','23 Blvd.','Tsawassen','BC', 'T2F8M4','Canada', '(604) 555-4729','(604) 555-3745')
11> go

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)
1>    -- But this does
2>    DECLARE @NumberOfLetters AS int
3>    SET @NumberOfLetters = 15
4>    DECLARE @str AS varchar(255)
5>    SET @str = 'SELECT LEFT(CompanyName,' + CAST(@NumberOfLetters AS varchar) + ') AS
6~    ShortName FROM Customers'
7>    EXEC(@str)
8> GO
ShortName
---------------
A
M
H
B
S
F
C
P
D

(9 rows affected)
1>
2> drop table Customers;
3> GO

 

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