Distinct Count in SQL with conditions

Hi All,

I need to identify the PtID that have 2+ unique ORDER_MED_ID'S and the DISCON_TIME is null, I'll need to display the number of unique ORDER_MED_ID's that meet the condition and then limit the query to people that have 2+ unique ORDER_MED_ID'S that meet the condition.   How can I accomplish this?


from PAT_ENC pae
inner join ORDER_MED orm ON pae.PAT_ENC_CSN_ID=orm.PAT_ENC_CSN_ID

#ofmeds >=2

From the example below, PtID 1234 and 3456 meet the condition.

The results look like this:
PtID                    ORDER_MED_ID               DISCON_TIME

1234                    0101233                          
1234                    0101234                          
1234                    0101235                          
1234                    0101236
2345                    0101237
3456                    0101238
3456                    0101239
3456                    0101240                           2015-07-20
4567                    0101241                           2015-07-20
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It looks that ORDER_MED_ID is unique (correct?)
ThenTry that,

select   PtID , count(*) ,
from PAT_ENC pae
inner join ORDER_MED orm ON pae.PAT_ENC_CSN_ID=orm.PAT_ENC_CSN_ID
Group by PtID
Having count(*)>=2

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jul_to_coolAuthor Commented:
Thanks!  That's what I needed!
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Microsoft SQL Server

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