1. Entire row getting duplicated because there is no primary key or unique key. 2. Only primary key or unique key value is different, but remaining all values are same. Scenario 1: Delete duplicate rows without primary key or unique key. Let us create the following example. create table c...
INSERT INTO customer(NAME,phone,DATA) VALUES("小八","17610111118","8") ON DUPLICATE KEY UPDATE DATA = "88" 1. 结论:此时根据name + phone判断出数据库不存在该记录,故新增,等同于直接 insert into,ON DUPLICATE KEY UPDATE DATA = "88"无效! 测试9: INSERT INTO customer(NAME,phone,DATA) VALUES(...
简介:解决出现的SQLIntegrityConstraintViolationExceptionw:Duplicate entry ‘10‘ for for key ‘user.PRIMARY‘问题 错误描述: 这个错误出现的原因是:在向 MySQL 数据库的表中添加一条记录时,违反了唯一性约束条件,实际上是指插入的记录与表中已有的记录存在主键(或唯一性)冲突,导致插入失败。 例如,在以下示例中,...
INSERT IGNORE INTO table_name VALUES (...); -- 使用ON DUPLICATE KEY UPDATE更新重复记录 INSERT INTO table_name VALUES (...) ON DUPLICATE KEY UPDATE column=VALUES(column); -- 或者先删除重复记录再插入 DELETE FROM table_name WHERE primary_key=value; INSERT INTO table_name VALUES (...); 1...
How to Delete the Duplicate Rows Delete key1by Büşra ÖZCOŞKUNCC BY-SA 4.0 Now you've identified the copies, you often want to delete the extra rows. For simplicity, I'm going to assume that either the rows are exact copies or you don't care which you remove. ...
java.sql.SQLException: Duplicate entry'1300'forkey 'PRIMARY'at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readErrorPacket(AbstractQueryProtocol.java:1681) ~[mariadb-java-client-2.7.2.jar!/:na] at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.ja...
构建Shell任务调用DataX进行MaxCompute源读取到MySQL写入的数据同步,执行报错提示有脏数据,报错信息为“java.sql.BatchUpdateException: Duplicate entry '...' for key 'PRIMARY'”。 问题原因 根据报错判断,MySQL写入数据,若出现主键冲突,当writeMode为insert时会提示有脏数据。
Primary key violation: If there is any duplicate primary key constraint in the same database, it will cause an error. Use a SELECT statement to check whether the primary key exists or not. If it is, either delete it or create another Primary key. Foreign key violation: When the fore...
主键使用UUID报java.sql.SQLIntegrityConstraintViolationException: Duplicate entry ‘0‘ for key ‘PRIMARY‘,程序员大本营,技术文章内容聚合第一站。
DELETE is a DML command, so when you rollback all the transactions are undone and the records are restored. Here is an example for the same: BEGIN TRANSACTION; DELETE FROM employees WHERE employee_id = 101; ROLLBACK; 106. How to find duplicate records in SQL? To find duplicate records...