Undefine variable : Variable « SQL PLUS Session Environment « Oracle PL/SQL Tutorial






  1. Oracle PL/SQL Tutorial
  2. SQL PLUS Session Environment
  3. Variable
SQL>
SQL> UNDEFINE user_name
SQL> VARIABLE l_user VARCHAR2(30)
SQL> EXECUTE :l_user := '&user_name';
Enter value for user_name:

PL/SQL procedure successfully completed.

SQL> SELECT 'User ' || :l_user || ' has ' || TO_CHAR(COUNT(*)) || ' tables.'
  2  FROM all_tables
  3  WHERE owner = UPPER(:l_user);
User  has 0 tables.

1 row selected.

SQL>








29.61.Variable
29.61.1.Use 'variable command' to define variable to reference cursor
29.61.2.Bind variables can be declared in your SQL*Plus script,Preface a bind variable with a colon to reference it in a PL/SQL block
29.61.3.Bind variables can even be referenced by SQL queries
29.61.4.Define variable and print its value out
29.61.5.Define variable and set value
29.61.6.Define variable and use it in sql statement
29.61.7.Print variable out
29.61.8.Undefine variable
29.61.9.Check pre-defined variables
29.61.10.Use defined-variable in update set statement