How to execute dynamically generated using GR 11, 2 SQL statements?
HelloI would like to know if it is possible to do what the following statement which is intended :
select * from (select replace('select empno from emp',
'',
'') from dual);
in other words, is it possible to dynamically generate and execute a select statement in a from clause?Thank you for your help,
John
Published by: 440bx 16 July 2010 15:57 modified 'create' to 'generate' to the subject
Like many I know no. in SQL. Results of your query in the FROM clause will not be transformed as another query, but just a litral value and your outer query returns this value as "select empno from emp".
But you can use dynamic sql statements in PL/SQL using EXECUTE IMMEDIATE or DBMS_SQL.
Something like that.
DECLARE
dynamic_from_clause VARCHAR2(4000) := 'select empno from emp';
vReturnVal NUMBER;
BEGIN
EXECUTE IMMEDIATE 'SELECT * FROM ('||dynamic_from_clause||')' into vReturnVal ;
END;
/
Just write memory have not tested it.
Tags: Database
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