Getting row count

is there any other way than select count(*) from tableName to get the number of rows in a table or to know if the table has any records or not ?
Thanks !

To get an exact count? No, that's the only way.
If you're using the cost-based optimizer (CBO) and your statistics are up to date and you can tolerate an estimate, you could query the NUM_ROWS column of DBA_/USER_/ALL_TABLES for the table in question.
Justin

Similar Messages

  • GETTING ROW COUNTS OF ALL TABLES AT A TIME

    Is there any column in any Data dictionary table which gives the row counts for particular table..
    My scenario is...i need to get row counts of some 100 tables in our database...
    instead of doing select count(*) for each table....is there any way i can do it?
    similary How to get column counts for each table..in database .For example
    Employee table has 3 columns...empid,empname,deptno....i want count(empid),
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    Why does "select count(mgr) from emp" return null and not 13?Good question ;)
    Seems that xml generation in principle can't handle »counting nulls«:
    SQL> select xmltype(cursor(select null c from dual)) x from dual
    X                                                
    <?xml version="1.0"?>                            
    <ROWSET>                                         
    <ROW>                                           
    </ROW>                                          
    </ROWSET>                                        
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    SQL> select cursor(select count(null) c from dual) x from dual
    Cur
    0 
    1 row selected.
    SQL> select xmltype(cursor(select count(null) c from dual)) x from dual
    select xmltype(cursor(select count(null) c from dual)) x from dual
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    ORA-31011: XML parsing failed
    ORA-19202: Error occurred in XML processing
    LPX-00229: input source is empty
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    ORA-06512: at "SYS.XMLTYPE", line 0
    ORA-06512: at line 1
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    SQL> select xmltype(cursor(select count(1) c from dual)) x from dual
    X                                                
    <?xml version="1.0"?>                            
    <ROWSET>                                         
    <ROW>                                           
      <C>1</C>                                       
    </ROW>                                          
    </ROWSET>                                        
    1 row selected.Looks like a bug to me ...

  • Trying to get row counts for all tables at a time

    Hi,
    i am trying to get row counts in database at a time with below query but i am getting error:
    its giving me ora-19202 error..please advise me
    select
          table_name,
          to_number(
            extractvalue(
              xmltype(dbms_xmlgen.getxml('select count(*) c from '||table_name))
              ,'/ROWSET/ROW/C')
              count
        from all_tables;

    ALL_TABLES returns tables/views current user has access to. These tables/views are owned not just by current user. However your code
    dbms_xmlgen.getxml('select count(*) c from '||table_name)does not specify who the owner is. You need to change it to:
    dbms_xmlgen.getxml('select count(*) c from '||owner || '.' || table_name)However, it still will not work. Why? As I said, ALL_TABLES returns tables/views current user has access to. Any type of access, not just SELECT. So if current user is, for example, granted nothing but UPDATE on some table the above select will fail. You would have to filter ALL_TABLES through ALL_SYS_PRIVS, ALL_ROLE_PRIVS, ALL_TAB_PRIVS and PUBLIC to get list of tables current user can select from. For example, code below does it for tables/views owned by current user and tables/views current user is explicitly granted SELECT:
    select
          t.owner,
          t.table_name,
          to_number(
            extractvalue(
              xmltype(dbms_xmlgen.getxml('select count(*) c from '||t.owner || '.' || t.table_name))
              ,'/ROWSET/ROW/C')
              count
        from all_tables t,user_tab_privs p
        where t.owner = p.owner
          and t.table_name = p.table_name
          and privilege = 'SELECT'
    union all
    select
          user,
          t.table_name,
          to_number(
            extractvalue(
              xmltype(dbms_xmlgen.getxml('select count(*) c from '||t.table_name))
              ,'/ROWSET/ROW/C')
              count
        from user_tables t
    OWNER                          TABLE_NAME                                                          COUNT
    SCOTT                          DEPT                                                                    4
    U1                             QAQA                                                                    0
    U1                             TBL                                                                     0
    U1                             EMP                                                                     1
    SQL> SY.

  • Get row count for different tables to the same line

    How can I get the row count for different tables in one line:
    SELECT count(A), count(B), count(C) from table tb_a A , tb_b B, tb_c C;
    Thanks!

    >
    Hi,
    How can I get the row count for different tables in one line:
    SELECT count(A), count(B), count(C) from table tb_a A , tb_b B, tb_c C;Something like this? One of the many uses for CTE's - Common Table Expressions - AKA
    subquery refactoring. Worth getting to know - very handy!
    with acount as
      select count(*) as counta from dual  -- put your table name here
    bcount as
      select count(*) as countb from dual  -- put your table name here
    ccount as
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    select a.counta, b.countb, c.countc from acount a, bcount b, ccount c;HTH,
    Paul...
    Edited by: Paulie on 25-Jul-2012 17:44

  • Dynamically Add Report Parameters & Get Row Count

    In out Portal reports, we are inserting records into our own logging tables at the beginning of the report and updating the record at the end of the report. Currently, the sequential key has been added as a parameter so that we can access it through-out the report execution. Therefore, it displays on the parameter screen. We don't want the users to see this item. Is it possible to add it to the parameter list without having it display on the screen? Can this be done using a procedure in wwv_standard_util? Any other suggestions?
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    In out Portal reports, we are inserting records into our own logging tables at the beginning of the report and updating the record at the end of the report. Currently, the sequential key has been added as a parameter so that we can access it through-out the report execution. Therefore, it displays on the parameter screen. We don't want the users to see this item. Is it possible to add it to the parameter list without having it display on the screen? Can this be done using a procedure in wwv_standard_util? Any other suggestions?
    Also, we need to get the total row count of the query. Where can we get this value?
    null

  • Getting row count of file into table column

    Hi experts,
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    My design is to create table in the summary file format & update the data's in it then using OdiSqlUnload to generate the required summary file, for this purpose I need to insert the row count of the file generated.
    I tried to get the row count using the http://odiexperts.com/get-file-length-and-header-in-operator post. But passing the "lines" value into a ODI variable or inserting into a table column is not working.
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  • Get row count issue

    Hi all
    my requirement is
    Get the count of rows returned by the query and if the number exceeds 500 display a warning .
    below is my code in process form request
    I have put the below code at the end of the Process form request
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    Please help me
    Thanks

    Hi Modify ur code like this
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  • Most efficient way to get row count with a where clause

    Have not found a definitive answer on how to do this.  Is there a better way to get a row count from a large table that needs to satisfy a where clause like so:
    SELECT COUNT(*) FROM BigTable WHERE TypeName = 'ABC'
    I have seen several posts suggesting something like 
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    It needs index to improve the performance. 
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  • How to get row count(*) for each table that matches a pattern

    I have the following query that returns all tables that match a pattern (tablename_ and then 4 digits). I also want to return the row counts for these tables.
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    The like operator requires a string operand.
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    Example:
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    http://www.sqlusa.com/bestpractices2005/alltablesrowcount/
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    New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

  • How to get row count of a sql query

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    Number of rows in a ResultSet may be obtained with:
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  • Can we get row counts when using dbms_datapump?

    When using dbms_datapump, is there a way to get the rows loaded for each table, similar to the log files when using the command line? I can't seem to find anything. I'm trying to import. Database is 10g r2.

    if you don't have to use DBMS_DATAPUMP and can use external tables for the import (both work exactly same way), then you can use ROWCOUNT
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  • Unable to get the row count of supplier site for each supplier

    Hi,
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  • Get the Count for each row

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  • Get the count of rows in a table control

    Hi Experts,
      How do I get the count of the rows in a table control during run time.
    I am developing a BDC in which I have to check all entries in a table control.
    My requirement is to get the total number of rows in a table control dynamically.
    Thanks
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  • How to get the row Count of a ResultSet

    How to get the row Count of a ResultSet

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    Any help would be greatly apprecite!
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