Count number of rows in a table

Hi,
I have a requirement. I want to frame a SQL, which takes schema name as input and returns tables owned by that schema and number of rows inside a particular table.
A Sample output:
===========
Table            No. of Rows
~~~~          ~~~~~~~~
A                    123
B                    126
C                    234
.Can somebody help me in framing a query for the same.
Regards,

hoek wrote:
But you could use this script:
http://laurentschneider.com/wordpress/2007/04/how-do-i-store-the-counts-of-all-tables.html
Laurent's solution most likely was published before IOT. Anyway, IOT ovwerflow tables must be excluded. Otherwise:
SQL> select table_name,
2          to_number(
3                    extractvalue(
4                                 xmltype(
5                                         dbms_xmlgen.getxml('select count(*) c from '||owner || '.' || table_name)),'/ROWSET/ROW/C')) cou
6    from dba_tables
7    where owner = 'OE'
8 /
ERROR:
ORA-19202: Error occurred in XML processing
ORA-25191: cannot reference overflow table of an index-organized table
ORA-06512: at "SYS.DBMS_XMLGEN", line 176
ORA-06512: at line 1
no rows selected
SQL> select table_name,
2          to_number(
3                    extractvalue(
4                                 xmltype(
5                                         dbms_xmlgen.getxml('select count(*) c from '||owner || '.' || table_name)),'/ROWSET/ROW/C')) count
6    from dba_tables
7    where owner = 'OE'
8      and nvl(iot_type,'X') != 'IOT_OVERFLOW'
9 /
TABLE_NAME                          COUNT
CUSTOMERS                             319
WAREHOUSES                              9
ORDER_ITEMS                           665
ORDERS                                105
INVENTORIES                          1112
PRODUCT_INFORMATION                   288
PRODUCT_DESCRIPTIONS                 8640
PROMOTIONS                              2
PRODUCT_REF_LIST_NESTEDTAB            288
SUBCATEGORY_REF_LIST_NESTEDTAB         21
10 rows selected.
SQL> SY.

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Count number of rows in table

Hi!
1. How can you through ABAP and select statements count the number of rows in one table?
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regards
Baran

HI,
No you don't have to count number of rows first, Internal table size will increase dynamically. you have to declare this with initial size like this.
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Regards,

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How to count number of rows in table

can I get number of row in table except Count(*) in pl/sql
is there any other way

Also posted and answered here
how to count number of rows in table
count(*) will be the fastest way. It is only slow if the table has a vast number of rows, in which case why do you need to know the tables has 73552436467721 rows and not 73552436467737 rows. It doesn't seem to be much use. Either that or you are counting them a lot, which again seems rather pointless.

How to find number of rows in a table

i have one table ,it contains millions of record,how can i know number of rows in that table without using count(*),
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regards,
singh

Ok, that only was to show simply that max option
might not an option to reduce execution time.Yes, but I/O variances have a tendency to really skew the observed elapsed execution time - making execution time alone a poor choice to determine what SQL will perform better than another.
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COUNT(*)
10000
Execution Plan
Plan hash value: 2656308840
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 35 (9)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TESTTAB | 9262 | 35 (9)| 00:00:01 |
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- dynamic sampling used for this statement
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0 recursive calls
0 db block gets
131 consistent gets
0 physical reads
0 redo size
223 bytes sent via SQL*Net to client
238 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
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MAX(ROWNUM)
10000
Execution Plan
Plan hash value: 2387991791
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 35 (9)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | COUNT | | | | |
| 3 | TABLE ACCESS FULL| TESTTAB | 9262 | 35 (9)| 00:00:01 |
Note
- dynamic sampling used for this statement
Statistics
0 recursive calls
0 db block gets
131 consistent gets
0 physical reads
0 redo size
225 bytes sent via SQL*Net to client
238 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
So seeing that we have the exact same baseline for both queries, and that PIO does not influence the results, we time a 1000 executions of both.
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2 cnt number;
3 begin
4 for i in 1..1000
5 loop
6 select count(*) into cnt from testtab;
7 end loop;
8 end;
9 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:03.19
SQL>
SQL> declare
2 cnt number;
3 begin
4 for i in 1..1000
5 loop
6 select max(rownum) into cnt from testtab;
7 end loop;
8 end;
9 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:15.87
SQL>
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[Help3|http://wiki.sdn.sap.com/wiki/display/KMC/GettinganimagefromKMDocumenttobeusedinWeb+DynPro]
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hi,
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Count number of rows in a table

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