如何使用PHP或MySQL对一个表中的不同列求和，并在另一表中获得求和结果？

Question

Below is the tables example:

stock_entries as table 1 
stockid  supplier    item    total   payment   balance
   1      john      iphone    100      10        90
   2     charles     itel      50      40        10
   3      john       ipad     500     250       250
   4      alex      tecno      20      20         0
   5     charles    ipad       30      0         30

supplier_details as table 2
number    supplier    contact    total_balance
  1        alex       0843433         ?
  2       charles     7784336         ?
  3        john      21184584         ?

I want to sum balance column from stock_entries table for each supplier and get the result in supplier_details table under the column total_balance . For instance, to get total_balance for john, the system will automatically check the balance column from stock_entries table where supplier name is john and sum the balance found for john and put the result as total_balance in supplier_details table.

I want it perform something like this from stock_entries table, john: 90+250=380 where 380= total_balance which will go to total_balance column in supplier_detail. the same thing for the other suppliers.

Answer 1

You're looking for something like:

insert into table2 (field1, field2) 
   select sum(whatever), otherfield 
   from table1 
   where otherfield in('val1', 'val2')
   group by otherfield ;