sql - Counting same column multiple times, already grouped -


i'm trying count "y"s , "n"s in 1 column group them column. can pull "y" or "n" where: 

select table2.group_by_this,count(table1.flag) table1 inner join table2 on table1.primary_key = table2.foreign_key table1.flag_required = "y" group table2.group_by_this

and can see "y"s , "n"s whole data set , not grouped other column using first answer here: sql - counting column twice i'm not sure how desired outcome should little this:

group_by_this  y count  n count ------------------------------- group1         10       1 group2         10       100 group3         0        10 group4         50       500 group5         1000     0

do need further grouping somehow?

select  table2.group_by_this ,       count(case when table1.flag = 'y' 1 end) ,       count(case when table1.flag = 'n' 1 end)    table1  join    table2  on      table1.primary_key = table2.foreign_key group          table2.group_by_this

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