回答編集履歴
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追記
test
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@@ -6,7 +6,59 @@
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SQL自体はそのような感じで他の方法でも大差は無いと思います。
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```SQL
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select class,
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case sex
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when '女' then '女'
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when '男' and info like 'man%' then '男'
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when '男' and info not like 'man%' then '不明' END
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,count(*)
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from table1
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group by class,
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case sex
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when '女' then '女'
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when '男' and info like 'man%' then '男'
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when '男' and info not like 'man%' then '不明' END
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```
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可読性を高めるなら
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```SQL
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select class, new_sex, count(*)
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from (
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select class,
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case sex
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when '女' then '女'
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when '男' and info like 'man%' then '男'
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when '男' and info not like 'man%' then '不明' END as new_sex
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from table1
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) t1
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group by class, new_sex
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```
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性能という事なら、式インデックスを適用すると良いかもしれません。
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