sql - Combining similar names and counting distinct from a single column -


i attempting combine rows similar names within single column. data using has clients listed same name: 

| client_column | address | |   xyz isd     | 1 drive | |   xyz isd     | 2 drive | |   xyz isd     | 3 drive |

however, there records same client has distinct, similar name alternate address: 

| client_column  |  address |  |    abc inc.    | 101 lane |  |  abc inc. - p1 | 102 lane |  |  abc inc. - p2 | 103 lane |

i count total number of distinct addresses each client in table. in example, xyz isd , abc inc. each have 3 unique addresses. how can adjust script can achieve result?

i think need use sum aggregate total, not sure how. able count addresses clients exact same name accuracy, ones similar names display single record addresscount.

here script:

select clientname, count(address) addresscount tablea  group clientname order addresscount

result:

| client_column | addresscount | |    blue llc   |      15      |  |    psc parts  |      14      | |    abc inc.   |       1      | | abc inc. - p1 |       1      | | abc inc. - p2 |       1      |


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