sql - Updating a table with a groupwise maximum MYSQL? -

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i had table duplicate user_ids many 1 relationship tasks , payment.

i used groupwise maximum on tasks return rows had highest task completion percentage. update new table highest payment completion stats same table.

for example:

id    date                 taskid  payid  task_completion  pay_value 4722  2007-11-08 16:20:14  2       3      7.14             0 4722  2007-11-08 16:20:14  3       3      0.00             0 4722  2007-11-08 16:20:14  5       3      0.00             0 4722  2007-11-08 16:20:14  2       6      7.14             40 4722  2007-11-08 16:20:14  3       6      0.00             40 4722  2007-11-08 16:20:14  5       6      0.00             40 4724  2007-11-20 15:32:40  4       7      25.71            105 4726  2008-01-28 11:44:50  7       8      7.14             52 4726  2008-01-28 11:44:50  8       8      34.29            52 4726  2008-01-28 11:44:50  10      8      65.71            52 4726  2008-01-28 11:44:50  7       9      7.14             24 4726  2008-01-28 11:44:50  8       9      34.29            24

so have used groupwise maximum on task completion create new table (with unique id) follows:

id    date                 taskid  payid  task_completion  pay_value 4722  2007-11-08 16:20:14  2       3      7.14             0 4724  2007-11-20 15:32:40  4       7      25.71            105 4726  2008-01-28 11:44:50  10      8      65.71            52

the problem id 4722 highest pay_value , payid have not been inserted resulting table.

i update in form (using select):

select      s1.payid,     s1.pay_value,     f_tbl s1         left join     f_tbl s2 on s1.cashid = s2.cashid         , s1.pay_value > s2.pay_value     s2.cash_id null group user_id;

however seems updating final table based on query not possible. stumped, thank assistance.

you need join in update this. assuming query correct:

update summarytable st cross join        (select s1.payid, s1.pay_value,         f_tbl s1 left join              f_tbl s2              on s1.cashid = s2.cashid , s1.pay_value > s2.pay_value         s2.cash_id null         group user_id        ) toupdate     set st.payid = toupdate.payid,         st.pay_value = toupdate.pay_value     st.taskid = 4722;

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