SQL查詢：沒有得到正確的輸出

Question

我在下表中有add_days和remove_days而不是零，我希望得到尊重的輸出，任何人都可以幫助我獲取正確的SQL語句

我試了很多

E_ID H_ID   ADD_DAYS  REMOVE_DAYS
1   1   "2" "0"
2   2   "4" "0"
2   2   "0" "1"
3   3   "2" "0"
3   3   "0" "4"
3   4   "0" "4"

實際

E_ID H_ID   ADD_DAYS  REMOVE_DAYS
1   1   "2" "0"
2   2   "4" "0"
2   2   "0" "1"
3   3   "2" "0"
3   3   "0" "4"
3   4   "0" "4"

預期

E_ID H_ID   ADD_DAYS  REMOVE_DAYS
1   1   "2" "0"
2   2   "4" "1"
3   3   "2" "4"
3   4   "0" "4"

Answer 1

您可以在下面嘗試-

select e_id, h_id, max(ADD_DAYS),max(REMOVE_DAYS)
from tablename
group by e_id, h_id