sql - How to get multiple counts based on different criterias -


i need making query found site first time , hoping here knows how it.

lets database has 3 columns (name,type,and decision). in name field there 100 records , there can duplicates. there 2 different types (online , offline), , 2 kinds of decisions (match or mismatch).

what need count of matches , mismatches each type, grouped name.

the table columns below:

name|online match count|online mismatch count|offline match count|offline mismatch count|

also if of fields have count of 0, want display 0 well.

does know how this? appreciate it.

this common technique , called pivot query.

select   name,   sum(case when type='online' , decision='match' 1 else 0 end) "online match count",   sum(case when type='online' , decision='mismatch' 1 else 0 end) "online mismatch count",   sum(case when type='offline' , decision='match' 1 else 0) "offline match count",   sum(case when type='offline' , decision='mismatch' 1 else 0 end) "offline mismatch count" tablename group name

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