sql - Select an ID if count is equal to 1 -


I am trying to write a query, which results in the identification number based on only 3 WHERE values ​​1 .

Then say I want to find a patient's id and my section first name , last name and < Code> Date of Birth . If there are 2 results of duplicates, then I need to have the outlet zero and return the patient ID. 

  If (select the count (*) from the patient where last_name = 'James' and First_name = 'jones' and birth_DtTM = '1980-01-01');  
    
  
  
  
 Div class = "post-text "Itemprop =" text "> 
  count (*)> 1 'NULL' and 'Pat_ID1' Finally, from the patient where the last_name = 'James' and first_name =' Jones' and birth_DtTM = '1980-01-01' Group by Pat_ID1 '
< / Html>
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