回答編集履歴
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追記
test
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UNIONしてWHERE VALUE=? でCOUNTすればよいのでは
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# 追記
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同じ条件を設定する場合変数を使えば、与える値は１度で済みます
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```SQL
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select count(*) from (
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select value from TA where value=(@a:='aaa')
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UNION select value from TB where value=@a
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)as sub ;
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```
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でもよくよく考えたら値がほしい訳じゃないので
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それぞれのcountを足すだけでもよいですね
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```SQL
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select
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(select count(*) from TA where value=(@a:='aaa'))
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+(select count(*) from TB where value=@a) as count
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```
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