Search for column in all tables

Question

I want to search for a column value(example instance_id=123456) in all the tables using one query rather than describing each table to find first if instance id exist and if so do a select from that table.

Answer 1

You could try some sort of variation of this:
DECLARE
   value_of_interest    NUMBER := 12345;
   vTable          ALL_TAB_COLS.TABLE_NAME%TYPE;
   vExist          ALL_TAB_COLS.COLUMN_NAME%TYPE;
BEGIN
   DBMS_OUTPUT.PUT_LINE(RPAD('TABLE',45,' ') || ' ' || 'EXISTS');
   FOR rec in (SELECT TABLE_NAME FROM ALL_TAB_COLS WHERE COLUMN_NAME='INSTANCE_ID')
           LOOP
                   EXECUTE IMMEDIATE 'SELECT ''' || rec.table_name || ''' AS TAB,DECODE(count(*),0,''NO'',''YES'') AS EXIST FROM '
                           ||  rec.table_name
                           || ' WHERE INSTANCE_ID=:value '
                           || 'GROUP BY ''' || rec.table_name || '''' INTO vTable,vExist USING value_of_interest;
                   DBMS_OUTPUT.PUT_LINE(RPAD(vTable,45,' ') || ' ' || vExist);
           END LOOP;
EXCEPTION
   WHEN NO_DATA_FOUND THEN
           DBMS_OUTPUT.PUT_LINE('No Results found!');
END;Please be aware this that has not been tested, and may have to be modified for your use.