Need Help With Adding A Duplicate Record Count Column To Query

Jul 23, 2005

I am attempting to create a simple recordset that would return the
number of duplicates that exist in a table with a single column. For
example if I had a table like the following:

ID Reference Amount
1 123456 1.00
2 123456 2.00
3 123 1.00

I would like to get the following result:

ID Reference Amount RecCount
1 123456 1.00 2
2 123456 2.00 2
3 123 1.00 1

Please help!
Thanks,
Shawn

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Sep 5, 2012

How do I count the number of alike values in a column and have that value as a count column.

Example using Col3:
Col1 Col2 Col3
A 12 Test
B 45 Test1
C 45 Test
D 12 Test
E 10 Test1
F 11 Test2

Result
Col1 Col2 Col3 Count
A 12 Test 3
B 45 Test1 2
C 45 Test 3
D 12 Test 3
E 10 Test1 2
F 11 Test2 1

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1         ESL       13         Science     30 
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1         ESL       12         Maths        50 
 
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When one student takes multiple subjects then count student only once, so in the above data 12 is one student id takes multiple subjects so counted only once. TotalStudents value is 1
 
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[code]...

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Previous thread discussion of this problem (I thought that Parameters corrected problem, but not in all cases???)

http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.sqlserver.ce&mid=0cd9cd3a-f9b0-477f-b1e7-c27eb76158ae

Here is the complete code:


SqlCeConnection _conn = null;

_conn = new SqlCeConnection(@"Data Source=program FilesTestResultSetevsoft.sdf;");

_conn.Open();


// DOES NOT WORK *** This statement does not return the record (it exist)

string _sql = "SELECT * FROM Product where RegDescr='0123456' ";




// works correctly

string _sql = "SELECT * FROM PRODUCT where ProdNum = 6523 ";


// works correctly *** as long as multiple records are returned

string _sql = "SELECT * FROM PRODUCT where RegDescr LIKE '01%' ";

// works correctly


string _sql = "SELECT * FROM PRODUCT where RegDescr='BACARDI SILVER RAZZ'";

SqlCeCommand _cmd = _conn.CreateCommand();

SqlCeDataReader _rdr;

_cmd.CommandText = _sql;

_cmd.CommandType = CommandType.Text;

// Same results using ExecuteResultSet or ExecuteReader

//_rdr = _cmd.ExecuteResultSet(ResultSetOptions.Scrollable | ResultSetOptions.Updatable);

_rdr = _cmd.ExecuteReader();



listBox1.Items.Add("In the while loop");

while (_rdr.Read())

{

listBox1.Items.Add(_rdr.GetValue(1) + " / " + _rdr.GetValue(3));

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listBox1.Items.Add("Done");

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