hadoop - how do retrieve specific row in Hive? -


i have dataset looks this:

---------------------------  cust | cost | cat   | name ---------------------------   1   |  2.5 | apple | pklady ---------------------------   1   |  3.5 | apple | greengr ---------------------------   1   |  1.2 | pear  | yellopear ----------------------------   1   |  4.5 | pear  |  greenpear -------------------------------

my hive query should compare cheapest price of each item customer bought. want 2.5 , 1.2 1 row difference. since new hive don't how ignore else until reach next category of item while still kept cheapest price in previous category.

you create subquery containing minimum cost each customer, , join original table:

select     mytable.*,     mincost.mincost,     cost - mincost costdifference mytable inner join     (select        cust,        min(cost) mincost     mytable     group cust) mincost on mytable.cust = mincost.cust

i created interactive sqlfiddle example using mysql, should work fine in hive.


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