1062 - duplicate entry '1' for
时间: 2023-11-06 16:20:19 浏览: 116
key 'PRIMARY' 是什么意思?这个错误是怎么产生的?
错误1062 - Duplicate entry '1' for key 'PRIMARY' 指的是在插入数据时,出现了主键重复的情况。每个表都有一个主键,用于唯一标识每一条记录。当尝试插入数据时,如果主键已经存在于表中,就会出现这个错误。这个错误的原因可能是在插入数据时,新数据的主键与已存在的数据的主键重复。
解决这个问题有几种方法:
1. 使用NotIn或Not Exists来过滤掉主键冲突的数据,即只插入主键不存在的数据。可以使用以下SQL语句:
INSERT INTO dbbackup.tb1 SELECT * FROM tb1 WHERE (key1, key2) NOT IN ( SELECT key1, key2 FROM dbbackup.tb1 );
或
INSERT INTO dbbackup.tb1 SELECT * FROM dbz.tb1 WHERE NOT EXISTS( SELECT dbbackup.tb1.`name` FROM dbbackup.tb1 WHERE dbbackup.tb1.key1 = dbz.tb1.key1 and dbbackup.tb1.key2= dbz.tb1.key2 );
2. 插入前先清空表,即先删除已存在的数据,再插入新的数据。可以使用以下SQL语句:
DELETE FROM dbbackup.tb1;
INSERT INTO dbbackup.tb1 SELECT * FROM tb1;
总之,解决这个错误的关键是保证插入的数据不会与已存在的数据产生主键冲突。可以通过过滤掉冲突的数据或清空表再插入的方式来解决这个问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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