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Usage of Variable in the sql Prompt

Usage of Variable in the sql Prompt

Usage of Variable in the sql Prompt

(OP)
Hi,

   How to declare a variable in the
SQL>Prompt and use the same in any PL/SQL
Block.Hope got my question.

Thanks in advance
Motto

RE: Usage of Variable in the sql Prompt

If you mean from within SQL*Plus:
'SET DEFINE ON' and then prefix your variable names with '&', eg.
   SELECT column1
   FROM   table
   WHERE  column2 = '&my_variable'
SQL*Plus will prompt you for the value every time it runs.
If you use '&&' as a prefix the variable will be kept for the
remainder of the SQL*Plus session.

I hope this answers your question.

RE: Usage of Variable in the sql Prompt

The use of & or && as variable markers may not be what you want here. These will simply perform text substitution within a SQL*Plus script. If you want to reference your value from within a PL/SQL stored procedure for example, you'll need to declare a bind variable.
To declare a PL/SQL variable in SQL*Plus, use the variable command, then reference it using a colon, e.g.
SQL> variable a number;
SQL> execute :a := 2;

PL/SQL procedure successfully completed

SQL> print a

        A
---------
        2

SQL> select :a * 4 from sys.dual;

     :A*4
---------
        8

SQL>

I hope this helps.

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