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我有一个包含 57k 条目的表，其中列 comp_phone (UNIQUE KEY Phone( comp_phone)) 现在我尝试用

update uk_data set comp_phone= REPLACE(comp_phone,'  ',' ')

但是因为我在此列上有 UNIQUE KEY 我收到错误

[SQL] update uk_data set comp_phone= REPLACE(comp_phone,'  ',' ')

[Err] 1062 - Duplicate entry '01268 203***' for key 'Phone'

所以我正在使用

DELETE FROM uk_data WHERE comp_phone = '01268 203***'

删除旧行。但这需要很长时间，因为我不知道在 REPLACE 之后有多少行重复所以有没有一种简单的方法来替换和删除或覆盖旧条目

谢谢

4

1 回答 1

1

测试这个查询

CREATE TEMPORARY table Kratika
(
    _id int,
    _value varchar(50)
);

INSERT INTO Kratika
SELECT 1, '1111222255' UNION 
SELECT 2, '1111222 255' UNION -- duplicate
SELECT 3, '11112222 55' UNION -- duplicate
SELECT 4, '1111222233'; -- not duplicate

SELECT * FROM Kratika;

DELETE FROM Kratika WHERE _value <> REPLACE(_value, ' ', '') ;

SELECT * FROM Kratika;

输出

1   1111222255
2   1111222 255
3   11112222 55
4   1111222233

-- Select after deletion of duplicate records
    1   1111222255
    4   1111222233

已编辑

如果你对 while 循环没问题，那么你可以测试一下（我不是 MySQL 开发人员，我不知道为什么 MySQL 不允许我编写 while 循环，所以创建了相同的 proc）

DROP PROCEDURE IF EXISTS test_kratik;
delimiter ##

CREATE PROCEDURE test_kratik
(

)
BEGIN
DROP table IF EXISTS Kratika;
CREATE TEMPORARY table Kratika
(
    _id int,
    _value varchar(50)
);

INSERT INTO Kratika
SELECT 1, '1111222255' UNION 
SELECT 2, '1111222 255' UNION -- duplicate
SELECT 3, '11112222 55' UNION -- duplicate
SELECT 4, '1111222233'; -- not duplicate

SELECT * FROM Kratika;

SET @ID := 0;
SET @DUP_ID := 0;
SET @value := '';

WHILE @ID <= (SELECT MAX(_id) FROM kratika) DO
    BEGIN
        IF EXISTS(SELECT _id from kratika WHERE _id = @ID) THEN
            BEGIN
                SET @value = (SELECT REPLACE(_value, ' ', '') from kratika WHERE _id = @ID);
                DELETE FROM kratika
                WHERE REPLACE(_value, ' ', '') = @value
                AND _id <> @ID;
            END;
        END IF;
        SET @ID = @ID + 1;
    END;
END WHILE;

UPDATE kratika
SET _value = REPLACE(_value, ' ', '') 
WHERE _value <> REPLACE(_value, ' ', '') ;

SELECT * FROM kratika;

END ##

delimiter ;

CALL test_kratik();

更新 如果你不想使用while循环就好了......

    DROP TABLE IF EXISTS Kratika; 

CREATE TEMPORARY table Kratika
(
    _id int,
    _value varchar(50)
);

INSERT INTO Kratika
SELECT 1, '1111222255' UNION 
SELECT 2, '1111222 255' UNION -- duplicate
SELECT 3, '11112222 55' UNION -- duplicate
SELECT 4, '111122 2233'; -- not duplicate

DROP TABLE IF EXISTS copy_temp; 

CREATE TEMPORARY table copy_temp  
(
    _id1 int,
    _value1 varchar(50)
);

INSERT INTO copy_temp
SELECT _id, _value FROM kratika;

SELECT * FROM Kratika;

DELETE FROM Kratika 
WHERE _id <> (SELECT _id1 FROM copy_temp 
WHERE REPLACE(_value, ' ', '') = REPLACE(_value1, ' ', '') 
Limit 1
);

UPDATE kratika
SET _value = REPLACE(_value, ' ', '') 
WHERE _value <> REPLACE(_value, ' ', '') ;


SELECT * FROM Kratika;

输出

1   1111222255
2   1111222 255
3   11112222 55
4   1111222233

更新后

1   1111222255
4   1111222233
于 2013-02-11T10:56:24.690 回答