mysql - Hive : finding items that customers bought together from transactions -


i working on mysql need replicate queries on hive.

i have table in form

transaction table

i retrieve following info:

resultant table

on mysql, below query works:

select c.original_item_id, c.bought_with_item_id, count(*) times_bought_together (   select a.item_id original_item_id, b.item_id bought_with_item_id   items   inner join items b   on a.transaction_id = b.transaction_id , a.item_id != b.item_id original_item_id in ('b','c')) c group c.original_item_id, c.bought_with_item_id;

but not able translate hive query, have tried lot of shuffling joins , replacing on conditions have not got necessary results. great if can find on this

hive not support not equality joins. can move condition a.item_id != b.item_id where clause:

create table items(transaction_id smallint, item_id string);  insert overwrite table items  select 1 , 'a'  default.dual union select 1 , 'b'  default.dual union select 1 , 'c'  default.dual union select 2 , 'b'  default.dual union select 2 , 'a'  default.dual union select 3 , 'a'  default.dual union select 4 , 'b'  default.dual union select 4 , 'c'  default.dual;  select c.original_item_id, c.bought_with_item_id, count(*) times_bought_together (       select a.item_id original_item_id, b.item_id bought_with_item_id       items       inner join items b on a.transaction_id = b.transaction_id                     a.item_id in ('b','c') --original_item_id         , a.item_id != b.item_id         ) c group c.original_item_id, c.bought_with_item_id; --- ok original_item_id        bought_with_item_id     times_bought_together b             2 b       c       2 c             1 c       b       2

time taken: 24.164 seconds, fetched: 4 row(s)


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