count()
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SELECT COUNT(*),0,0 FROM AGROUP BYUNION ALLSELECT 0,COUNT(*),0 FROM BGROUP BYUNION ALLSELECT 0,0,COUNT(*) FROM CGROUP BYSELECT SUM(A),SUM(B),SUM(C) FROM (SELECT COUNT(*) A,0 B,0 C FROM X GROUP BY UNION ALL SELECT 0 A,COUNT(*) B,0 C FROM B GROUP BY UNION ALL SELECT 0 A,0 B,COUNT(*) C FROM C GROUP BY) SELECT COUNT(*) A,0 B,0 C FROM X GROUP BY
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