MySQL как я могу опрашиваю таблицу базы данных по дням и месяцам и произвожу итоги

Question

У меня есть следующая таблица базы данных

"id","date_occurred","country","town","quantity" 
"1","2012-06-01","England","Andover","82" 
"2","2012-06-01","England","Colchester","569" 
"3","2012-06-01","England","Farnham","1" 
"4","2012-06-01","England","England","4" 
"5","2012-06-01","England","America","13" 
"6","2012-06-01","America","England","114" 
"7","2012-06-02","England","Andover","4" 
"8","2012-06-02","England","Colchester","207" 
"9","2012-06-02","America","England","14" 
"10","2012-06-03","England","Andover","3" 
"11","2012-06-03","England","Colchester","72" 
"12","2012-06-03","England","America","1" 
"13","2012-06-03","America","England","15" 
"14","2012-07-04","England","Andover","1" 
"15","2012-07-04","England","Colchester","309" 
"16","2012-07-04","England","America","4" 
"17","2012-07-04","America","England","11" 
"18","2012-08-05","England","Andover","2" 
"19","2012-08-05","England","Colchester","319" 
"20","2012-08-05","England","Farnham","1" 
"21","2012-08-05","England","America","4" 
"22","2012-08-05","America","England","25" 
"23","2012-08-06","England","Andover","93" 
"24","2013-06-06","England","Colchester","542" 
"25","2013-06-06","England","Farnham","1" 
"26","2013-06-06","England","England","4" 
"27","2013-06-06","England","America","7" 
"28","2013-06-06","America","England","115" 

Я хотел бы, чтобы произвести следующий вывод из запроса

Общих объем продаж в день в стране в течение данного месяца

2012-06-01 England 669 
2012-06-01 America 114 
2012-06-02 England 211 

Общий объем продаж в день за город для данного месяца

2012-06-01 Andover 82 
2012-06-02 Andover 4 

Я пытался различные запросы с группой по, сумму, и сосчитать, но не может получить правильный вывод.

любые простые решения или руководство приветствуются. Заранее спасибо

Answer 1

Попробуйте это:

Общий объем продаж в день в стране за данный месяц:

SELECT date_occurred, country, SUM(quantity) 
FROM tableA 
WHERE YEAR(date_occurred) = 2013 AND MONTH(date_occurred) = 6 
GROUP BY date_occurred, country 

Общий объем продаж в день за город за данный месяц:

SELECT date_occurred, town, SUM(quantity) 
FROM tableA 
WHERE YEAR(date_occurred) = 2013 AND MONTH(date_occurred) = 6 
GROUP BY date_occurred, town