Query to Find Table and Column Name by using a value

Question

Dear Legends,
I hope and surfed in our forums and google to find the Table Name and Column Name by having a value(Number/String). And my where clauses are
where owner NOT IN ('SYS','SYSTEM') and
      data_type IN ('CHAR','VARCHAR2','NUMBER')
May I have your help for building the query. and my query as follows
select a.owner, c.column_name, c.data_type, c.owner, c.table_name
from dba_objects a, all_tab_cols c
where a.owner NOT IN ('SYS','SYSTEM') and
where c.owner NOT IN ('SYS','SYSTEM') and
where c.data_type IN ('CHAR','VARCHAR2')
order by a.owner
Thanks,
Karthik

Answer 1

You can use
select * from user_tab_columns a, user_tables b
where a.table_name = b.table_name
and  a.data_type in ('NUMBER', 'VARCHAR2', 'NCHAR', 'CHAR');
Or if you want to user DBA_* tables, you can use.
select * from dba_tab_columns a, dba_tables b
where a.table_name = b.table_name
and a.owner = b.owner
and  a.data_type in ('NUMBER', 'VARCHAR2', 'NCHAR', 'CHAR')
and b.owner not in ('SYS', 'SYSTEM');
And now when I look a bit more closely, you don't need DBA_TABLES there. dba_tab_columns alone is sufficient. And requirement is still not clear yet. Why you need a group by there? If I get it right, you can use this.
select * from dba_tab_columns a
where a.data_type in ('NUMBER', 'VARCHAR2', 'NCHAR', 'CHAR')
and a.owner not in ('SYS', 'SYSTEM');
Whether you use group by or not, the query will give you the same output.
Ishan