Counting the number of occurences in a table column

Hi All
I have a table with a column that contains approx. 5000 6-digit codes. A number of these codes are duplicted in the column, and I want to count the number of occurences of each code. The column looks a bit like -
WCID
940042
920012
940652
940199
188949
155146
155196
174196
152148
151281
196209
174015
182163
195465
195318
182008
189589
150675
There can be mulitple instances of each WCID and I need to count the number of instances of each. I also have access to another table that also has a column of each WCID, but only once - ie no multiple instances. The second table is identical except that there are only single instances of each WCID.
I thought I could either loop through on the table to be counted, from 100000 to 999999 and count each occurence that way, but it would be very inefficient. The other way I thought would be to perhaps select a WCID from the unique table, count the occurence of that, select the next WCID from the unique table, count that and so on, however I'm not sure how to do it in PL/SQL. Perhaps select the WCID from the unique table into a cursor, loop through that and compare it with the original table and count the instances?
I hope this makes some sense, any help would be really appreciated
Thanks
Bill

Hi, Bill,
That sounds like a job for GROUP BY:
SELECT    wcid
,         COUNT (*)       AS num_found
FROM      table_x
GROUP BY wcid
ORDER BY wcid
I hope that answers your question.
If not, post CREATE TABLE and INSERT statements for a little sample data, and the results you want from that data.

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Criticism is welcomed
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hi
wat command is used to count the number of occurences of a charcter in a line?
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FIND
Searches for patterns.
Syntax
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To count the number of occurences of a character

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A method with a test driver:
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544064
real     0m4.449s
user     0m3.880s
sys     0m0.544s
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scott@ORCL>select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
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TEST_DUMMY                              1
A_TEST_TB_CASHFLOW_N                    1
TEST_CAST                               1
DEPT                                    4
EMP                                    14
BONUS                                   0
SALGRADE                                5
EMP_DETAILS                             3
T_EMP                                   0
AUDIT_T                                 0
TABLE_NAME                       TOT_ROWS
C_C                                     4
TRAIN_DET                               2
TEST_COM_IMP                            2
TIME_P                                  1
PRI_UQ                                  4
TEST_CHK                                0
ANSHUMANSAHAISGENIOUS                   1
T                                       1
XEUROPE                                 2
D_D                                     8
PUBLICTRANSPORT                         4
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XASIA                                   2
TF1                                     0
TEST_HH                                14
TEST_SWAP                               4
REVIVE_XML                              3
XGMT                                    1
CUSTOMER_DET                            1
FOURWHEELER                             2
SPOOL_LOG                              13
CITYTRANSPORT                           8
T1                                      2
TABLE_NAME                       TOT_ROWS
T2                                      2
A_A                                     1
B_B                                     2
AUTOMOBILE                              1
XDUAL                                   1
S_TEMP                                  0
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scott@ORCL>Regards.
Satyaki De.

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===========================
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===============================================
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Apply Fill Down
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Yvan KOENIG (VALLAURIS, France) samedi 6 août 2011 23:33:10
iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.0
My iDisk is : <http://public.me.com/koenigyvan>
Please : Search for questions similar to your own before submitting them to the community
To be the AW6 successor, iWork MUST integrate a TRUE DB, not a list organizer !

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Regards,
Barry

Counting the number of occurences in a table column

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