sql - How to count common neighbors of two users and calculate similarity? -

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the monthly_connections table contains columns calling_party, called_party, common_neighbors, neighborhood_overlap

so table describes users connected. 1 of measures user similarity neighborhood overlap defined following:

neighborhood_overlap = (number of nodes neighbors of both calling_party , called_party)/(number of nodes neighbors of @ least 1 of calling_party or called_party)

trying calculate number of common neighbors 2 users wrote following query:

select  count (*)  (select t1.neighbora       (           select called_party neighbora monthly_connections            calling_party = '9f7334bcf9000cd68d40302dc4801e60c027a7d1'            union select calling_party neighbora monthly_connections                 called_party = '9f7334bcf9000cd68d40302dc4801e60c027a7d1') t1                             inner join (select called_party neighborb monthly_connections                        calling_party = '10d149a4356e1aa3a8af604bd992bba141db53d2'                       union select calling_party neighborb monthly_connections                             called_party = '10d149a4356e1aa3a8af604bd992bba141db53d2') t2 on t1.neighbora = t2.neighborb) t3

the query above calculates number of common neighbors of users 10d149a4356e1aa3a8af604bd992bba141db53d2 , 9f7334bcf9000cd68d40302dc4801e60c027a7d1

the goal write query set value of column common neighbors , neighborhood overlap each pair of connection in table

does know how write query update columns common_neighbors , neighborhood_overlap?

for common neighbors started write following query not correct:

 update mc set     common_neighbors =      (select count (*)  (select t1.neighbora (select called_party neighbora monthly_connections calling_party = mc.calling_party union select calling_party neighbora monthly_connections called_party = mc.calling_party) t1 inner join (select called_party neighborb monthly_connections calling_party = mc.called_party union select calling_party neighborb monthly_connections called_party = mc.called_party) t2 on t1.neighbora = t2.neighborb) t3) monthly_connections mc inner join t3 on t3.calling_party = mc.calling_party , t3.called_party = mc.called_party

i think query works (though might not performant).

update mc     set common_neighbors = (select count (*)      (       (select called_party monthly_connections          calling_party = mc.calling_party          union        select calling_party monthly_connections          called_party = mc.calling_party       )         intersect       (select calling_party monthly_connections         called_party = mc.called_party          union        select called_party monthly_connections          calling_party = mc.called_party       )      ) t1    ) monthly_connections mc

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