数据库去重
Posted xiaowangba9494
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查询
SELECT
*
FROM
table A
WHERE
( A.the_date, A.exponent_code, A.exponent_value ) IN ( SELECT the_date, exponent_code, exponent_value FROM table GROUP BY the_date, exponent_code, exponent_value HAVING COUNT ( * ) > 1 )
AND A.ID NOT IN ( SELECT MIN ( ID ) FROM table GROUP BY the_date, exponent_code, exponent_value HAVING COUNT ( * ) > 1 )
LIMIT 10000 OFFSET 1
删除
DELETE
FROM
table A
WHERE
( A.the_date, A.exponent_code, A.exponent_value ) IN ( SELECT the_date, exponent_code, exponent_value FROM table GROUP BY the_date, exponent_code, exponent_value HAVING COUNT ( * ) > 1 )
AND A.ID NOT IN ( SELECT MIN ( ID ) FROM table GROUP BY the_date, exponent_code, exponent_value HAVING COUNT ( * ) > 1 )
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