SQL - Dynamic SQL

Data System Architecture


Some programs (a general-purpose report writer for example) must build and process a variety of SQL statements, where the exact text of the statement is unknown until run time. Such statements probably change from execution to execution. They are called dynamic SQL statements.


  statement||DECODE(ROWNUM, MAX(ROWNUM) over (PARTITION BY 1),' order by aantal, table_name;',' union all')
  SELECT 'select '''||table_name||''' table_name, count(1) numberOfRows from '||table_name AS statement
  FROM user_tables
  ORDER BY table_name

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