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Counting Oracle tables

Oracle Database Tips by Donald Burleson


Question:  How do I count the number of tables belonging to each schema?


Answer:  The data dictionary provides DBA_TABLES and a simple query to count tables for a schema owner might look like this:


select owner, count(*) from dba_tables;


Oracle ACE Laurent Schnieder has a more elegant solution for counting tables, using dbms_xmlgen to store the count list:

SQL> select
  2    table_name,
  3    to_number(
  4      extractvalue(
  5        xmltype(
  6     dbms_xmlgen.getxml('select count(*) c from '||table_name))
  7        ,'/ROWSET/ROW/C')) count
  8  from user_tables;

TABLE_NAME                      COUNT
------------------------------ ------
DEPT                                4
EMP                                14
BONUS                               0
SALGRADE                            5

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