在做統計報表的時候,通常會用到一些複雜的統計功能,而不是簡單的 count(*), sum(abc) 就可以的,這就用到了一些基於條件的統計功能。
帶條件取count記錄數
參考方法:
統計sub_type='REFUND_FEE’ 的記錄數:
方法一.select count(sub_type) from t where t.sub_type='REFUND_FEE’;
方法二.select sum(if( B.sub_type='REFUND_FEE’ ,1,0)) from t;
方法三.select count(B.sub_type=‘REFUND_FEE’ or null) from t;
解釋:
當select B.sub_type=‘REFUND_FEE’ 時:
如果sub_type爲REFUND_FEE則返回1,
不空且不爲REFUND_FEE否則返回0,
空時返回null。
所以B.sub_type=‘REFUND_FEE’ or null 只返回sub_type=‘REFUND_FEE’ 的,其餘的都返回null ,而count(列名)時是不會統計null的個數的
注:count(*)會把null的個數也統計在內
項目sql
SELECT subjectName,doctorName,count(1) AS sumNum,
count(OVERTIMES>0 or null)as overNum //只統計OVERTIMES>0的數
from ht_personstream
WHERE 1=1
and subjectId = #{subjectId}
= #{startTime} ]]> //mysql日期格式化
GROUP BY doctorId,subjectId
項目sql百分數保留兩位小數
SELECT
subjectName as name,
concat(convert(((SUM(OVERTIMES)/(count(1)+SUM(OVERTIMES)))*100 ),decimal(10,2)),'%') as VALUE
FROM HT_PERSONSTREAM
where isDeleted = 0
GROUP BY subjectId,doctorId
//利用在一條語句中count出不同的條件,記錄一下 ..
SELECT
SUM( goods_amount ) AS money,
count( * ) AS num,
count(if(pay_status=1,true,null)) AS success,
count(if(pay_status=2,true,null)) AS fall
FROM `tab_order_info`
WHERE user_id = 11
SUM()函數按條件求和
一般求和
select sum(money) from user group by id;
按條件求和
select sum(if(type=1,money,0)) from user group by id;