MySQL比較兩個表的數據

將全部數據從舊數據庫遷移到新數據庫，並驗證數據是否正確遷移，假設有兩個表：t1和t2 SELECT id,title FROM ( SELECT id, title FROM t1 UNION ALL SELECT id,title FROM t2 ) tbl GROUP BY id, title HAVING count(*) = 1 ORDER BY id; 若是沒有不

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