查詢指定年份的count()值
這方法需要對沒有資料的月份進行處理
方法二:這方法需要定義乙個1-12月份的實體類,所有月份全部顯示,對應月份沒有資料的列置零
select coalesce(count(),0) as jan,
(select ifnull(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-02』)) as feb,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-03』)) as mar,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-04』)) as apr,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-05』)) as may,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-06』)) as jun,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-07』)) as jul,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-08』)) as aug,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-09』)) as sept,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-10』)) as octo,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-11』)) as nov,
(select coalesce(count(),0) froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-12』)) as dece
froms_orderas o
where date_format(o.ordertime,』%y-%m』) = concat(#,』-01』)
查詢結果為
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