mysql - JOIN SQL queries results in one -


i make query of several select in one, query works without last select have error operand should contain 1 column can tell me how correct ?? 

select (  select count(*) mytable type = 'mss' , year(date) = year(curdate()) , month(date) = month(curdate())  ) total_mss, (  select count(*) mytable type = 'mss' , s = 0 , year(date) = year(curdate()) , month(date) = month(curdate()) ) mss_s, (  select count(*) mytable type = 'mss' , s != 0 , year(date) = year(curdate()) , month(date) = month(curdate()) ) mss_f, ( select count(*) nb ,or top mytable type = 'mss'  , year(date) = year(curdate()) , month(date) = month(curdate()) group or order nb desc limit 1 )

if execute them separately 

total_mss   mss_s   mss_f 99          12      87 
nb  top 78  j.r@domain.com

first of should use union join results , second or , top keywords need escape them (assuming table has column named or) :

select    count(*) nb ,   `or` `top`     mytable     type = 'mss'     , year(date) = year(curdate())    , month(date) = month(curdate())  group    `or`  order     nb desc  limit 1

also queries in union must have same amount of fields , have first 1 field , second 2 fields

select   sum(if(`top` = 'one',`nb`,0)) first_one,   sum(if(`top` = 'two',`nb`,0)) second_one,   sum(if(`top` = 'three',`nb`,0)) thrid_one,   sum(if(`top` not in ('three','two','one'),`nb`,0)) forth_one,   group_concat(if(`top` not in ('three','two','one'),`top`,'') separator '') `or` (     select          count(*) nb,         'one' `top`               mytable               type = 'mss'          , year(date) = year(curdate())          , month(date) = month(curdate())      union     select          count(*) nb,         'two' `top`               mytable               type = 'mss'          , s=0         , year(date) = year(curdate())          , month(date) = month(curdate())      union     select          count(*) nb,         'three' `top`               mytable               type = 'mss'          , s<>0         , year(date) = year(curdate())          , month(date) = month(curdate())      union     select       `nb`,       `top`     from(       select          count(*) nb ,         `or` `top`                 mytable                 type = 'mss'           , year(date) = year(curdate())          , month(date) = month(curdate())        group          `or`        order           nb desc        limit 1     ) tmp )as tmp1

update first 3 queries can resumed :

select      sum(if(s=0,1,0)) mss_s,     sum(if(s<>0,1,0)) mss_f,     count(*) total_mss      mytable       type = 'mss'      , year(date) = year(curdate())      , month(date) = month(curdate())

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