MySQL SUM()带条件的求和方法与多条件的求和方法解读

select sum(value) as value from table where user_id = 1 and type = 6 and type_son = 2

select 
(select sum(value) from table where type = 6 and type_son = 1) as xj0,
(select sum(value) from table where type = 6 and type_son = 2) as xj1,
(select sum(value) from table where type = 3 and type_son = 3) as xj2,
(select sum(value) from table where type = 4 and type_son = 3) as xj3
from table where user_id = 1 limit 0,1

select 
sum(IF(type = 6 and type_son = 1,value,NULL)) as xj0,
sum(IF(type = 6 and type_son = 2,value,NULL)) as xj1,
sum(IF(type = 3 and type_son = 0,value,NULL)) as xj2,
sum(IF(type = 4 and type_son = 3,value,NULL)) as xj3
from table where user_id = 1

$v['alls_bonus'] = AccountingLog::find()
        ->select(["
            sum( IF(type = 6 and type_son = 1,value,NULL) ) as xj0,
            sum( IF(type = 6 and type_son = 4,value,NULL) ) as xj1,
            sum( IF(type = 8 and type_son = 4,value,NULL) ) as xj2, 
            sum( IF(type = 3 and type_son = 1,value,NULL) ) as xj3
        "])
        ->where(['user_id'=>1])
        ->asArray()
        ->one();

select sum(is_img)  is_img_sum from ec_assessment

select sum(if(is_img=1,1,0)) asis_img_sum from ec_assessment