獲取重複數據一coulmn的數量在另一coulmn

Question

我需要這樣的結果不重複的日期

Answer 1

select SUM(`rooms_qty`),`date`,`room_id` FROM table GROUP BY date; 

Answer 2

SUM是你的朋友。您還必須附上反向字段名稱日期。日期是一個功能！

SELECT 
    SUM(rows_qty) AS rows_qty 
    , `date` 
    , room_id 
FROM 
    yourTable;