mysql - sql join two tables, one summary the other is detail -


when join 2 tables, not sure how join following tables exact wanted.

table a:

 -------------------------------------- |   id |   name |  buy time | total | -------------------------------------- |    1 |      |    3      |   30  | -------------------------------------- |    2 |    b   |    1      |   10  | --------------------------------------

table b:

 ------------------------------- |   id |  orderid | price  | ------------------------------- |   1  |     1    |   10   | ------------------------------- |   1  |     2    |   10   | ------------------------------- |   1  |     3    |   10   | ------------------------------- |   2  |     4    |   10   | -------------------------------

join table c

 --------------------------------------------------------- |  id |  name  |  buy time |  total |  orderid |  price | --------------------------------------------------------- |   1 |      |     3     |    30  |          |        | --------------------------------------------------------- |   1 |        |           |        |    1     |   10   | --------------------------------------------------------- |   1 |        |           |        |    2     |   10   | --------------------------------------------------------- |   1 |        |           |        |    3     |   10   | --------------------------------------------------------- |   2 |    b   |     1     |    10  |          |        | --------------------------------------------------------- |   2 |        |           |        |    4     |   10   | ---------------------------------------------------------

if use "left out join on a.id = b.id" blank area filled duplicated value, cause sum of total income incorrect

another way "select 0 name b", fill blank 0, disaster if number of column many.

therefore, ask there better way achieve goal?

what want union of both tables:

select id, name, `buy time`, total, null orderid, null price  union   select id, null, null, null, orderid, price b order id, name desc, orderid

demo here


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