select unique contact no from sql query and dont check other columns

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C#

cmd = new OleDbCommand("Select distinct contactno,cust_name from table1",con);

I am using query like above but it retrieve unique records when both contactno and cust_name are same.. I want to put distinct keyword only with contactno so that it retrieve records based on contactno and dont check cust_name.

Posted 2-Jul-13 6:38am

Harpreet_125

Updated 2-Jul-13 7:25am

Shahin Khorshidnia

v2

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Mayank Dubey · Answer 1 · 2013-07-02T08:34:00

As per my understanding it seems you have to fetch unique records those are with same contactno and cust_name .Above solution is perfect in this case .you can achieve this by another method as well..

C#

cmd = new OleDbCommand("select contactno,cust_name from table1 group by contactno,cust_name having count(distinct contactno)=1",con)

but if you want to remove duplicated ContactNo and cust_Name you can use it as

C#

cmd = new OleDbCommand("select contactno,cust_name from table1 group by contactno,cust_name having count(contactno)=1",con);

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2013-07-02T08:30:00

Solution 2

Refer - DISTINCT for only one Column[^].

Posted 2-Jul-13 8:30am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Pheonyx · Answer 3 · 2013-07-02T07:41:00

Solution 1

From what I understand of your question you are after the following:

cmd = new OleDbCommand("Select distinct contactno from table1",con);

I.e. a list of the distinct contactno's that are in table 1?

Posted 2-Jul-13 7:41am

Pheonyx