先複製出原表
CREATE TABLE 新表 SELECT * FROM 舊錶;
清空原表
DELETE FROM 舊錶;
複製去重後的數據回新表
INSERT INTO 舊錶 SELECT [所有字段] FROM 新表 GROUP BY [所有字段];
先複製出原表
CREATE TABLE 新表 SELECT * FROM 舊錶;
清空原表
DELETE FROM 舊錶;
複製去重後的數據回新表
INSERT INTO 舊錶 SELECT [所有字段] FROM 新表 GROUP BY [所有字段];