Varchar type variable is defined but has no value : VARCHAR2 « Data Type « Oracle PL / SQL

Home
Oracle PL / SQL
1.Aggregate Functions
2.Analytical Functions
3.Char Functions
4.Constraints
5.Conversion Functions
6.Cursor
7.Data Type
8.Date Timezone
9.Hierarchical Query
10.Index
11.Insert Delete Update
12.Large Objects
13.Numeric Math Functions
14.Object Oriented Database
15.PL SQL
16.Regular Expressions
17.Report Column Page
18.Result Set
19.Select Query
20.Sequence
21.SQL Plus
22.Stored Procedure Function
23.Subquery
24.System Packages
25.System Tables Views
26.Table
27.Table Joins
28.Trigger
29.User Previliege
30.View
31.XML
Oracle PL / SQL » Data Type » VARCHAR2 




Varchar type variable is defined but has no value
    

SQL>
SQL>
SQL> declare
  2      str  varchar2(50);
  3  begin
  4      Null;
  5  exception
  6      when others then
  7      raise_application_error (-20100'error#' || sqlcode || ' desc: ' || sqlerrm);
  8  end;
  9  /

PL/SQL procedure successfully completed.

SQL>

   
    
    
    
  














Related examples in the same category
1.Use varchar2 as table column type
2.Comparison of CHAR with VARCHAR2 (Test the strings for equality)
3.Use % with like in a select statement for varchar2 column
4.declare varchar2 variables
5.Init a varchar2 type variable
6.varchar type are case sensitive
7.varchar2 type value with not null default value
8.Combine text string value in select clause
9.Are two text value equal
10.IN with text value
11.Change varchar type value
12.Assign a character string that is too long
13.Compare varchar2 value with =
14.Read clob data to varchar2 type variable
15.Use select into clause to assign value to a varchar2 type variable and output with dbms_output.put_line
16.Use case with switch varchar2 variable
17.Insert value to char type and varchar2 type
18.Check data size for varchar2 column
19.Varchar2 type column with different byte length
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.