Question

Is it possible to search every field of every table for a particular value in Oracle?

There are hundreds of tables with thousands of rows in some tables so I know this could take a very long time to query. But the only thing I know is that a value for the field I would like to query against is 1/22/2008P09RR8. <

I’ve tried using this statement below to find an appropriate column based on what I think it should be named but it returned no results.

SELECT * from dba_objects  WHERE object_name like '%DTN%' 

There is absolutely no documentation on this database and I have no idea where this field is being pulled from.

Any thoughts?

Answer 1

Quote:

I’ve tried using this statement below to find an appropriate column based on what I think it should be named but it returned no results.*

SELECT * from dba_objects WHERE object_name like '%DTN%' 

A column isn’t an object. If you mean that you expect the column name to be like ‘%DTN%’, the query you want is:

SELECT owner, table_name, column_name FROM all_tab_columns WHERE column_name LIKE '%DTN%'; 

But if the ‘DTN’ string is just a guess on your part, that probably won’t help.

By the way, how certain are you that ‘1/22/2008P09RR8’ is a value selected directly from a single column? If you don’t know at all where it is coming from, it could be a concatenation of several columns, or the result of some function, or a value sitting in a nested table object. So you might be on a wild goose chase trying to check every column for that value. Can you not start with whatever client application is displaying this value and try to figure out what query it is using to obtain it?

Anyway, diciu’s answer gives one method of generating SQL queries to check every column of every table for the value. You can also do similar stuff entirely in one SQL session using a PL/SQL block and dynamic SQL. Here’s some hastily-written code for that:

    SET SERVEROUTPUT ON SIZE 100000      DECLARE       match_count INTEGER;     BEGIN       FOR t IN (SELECT owner, table_name, column_name                   FROM all_tab_columns                   WHERE owner <> 'SYS' and data_type LIKE '%CHAR%') LOOP          EXECUTE IMMEDIATE           'SELECT COUNT(*) FROM ' || t.owner || '.' || t.table_name ||           ' WHERE '||t.column_name||' = :1'           INTO match_count           USING '1/22/2008P09RR8';          IF match_count > 0 THEN           dbms_output.put_line( t.table_name ||' '||t.column_name||' '||match_count );         END IF;        END LOOP;      END;     / 

There are some ways you could make it more efficient too.

In this case, given the value you are looking for, you can clearly eliminate any column that is of NUMBER or DATE type, which would reduce the number of queries. Maybe even restrict it to columns where type is like ‘%CHAR%’.

Instead of one query per column, you could build one query per table like this:

SELECT * FROM table1   WHERE column1 = 'value'      OR column2 = 'value'      OR column3 = 'value'      ...      ;