mysql - Ratio Calculation in SQL based on different date fields -


i want calculate number of contacts made/number of orders placed per day how sample looks like:

orderid orderdate   contactid   contact date     1   11-may                 12-may     2   12-may        b          12-may     3   12-may        null       null     4   12-may        c          13-may     5   13-may        d          14-may

ex: ratio 12thmay 2/3(1,2,3 , a,b) need without joins. can please me sql or hive query this

this should give ratio you're looking for:

select isnull(orderdate, contactdate), concat(cast(isnull(contacts,0) char),'/',cast(isnull(orders,0) char)) ratio (select orderdate, count(orderdate) orders tbl orderdate not null group orderdate) o left join (select contactdate, count(contactdate) contacts tbl contactdate not null group contactdate) c on o.orderdate = c.contactdate union select isnull(orderdate, contactdate), cast(isnull(contacts,0) varchar) + '/' + cast(isnull(orders,0) varchar) (select orderdate, count(orderdate) orders @foobar orderdate not null group orderdate) o right join (select contactdate, count(contactdate) contacts @foobar contactdate not null group contactdate) c on o.orderdate = c.contactdate

i've added union in order replicate full outer join in case there date in contact date not in order date


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