WebNote: This is unique to MYSQL, not SQL standard syntax; 1. Processing logic. The insert into ... on duplicate key update ... statement is based on the unique index to determine whether the record is duplicated; If there is no record, insert it, and the number of affected rows is 1; If a record exists, the field can be updated, and the number of ...

MySQL 如何实现重复插入时更新 - 腾讯云开发者社区-腾讯云

WebUse the INSERT IGNORE command rather than the INSERT command. If a record doesn't duplicate an existing record, then MySQL inserts it as usual. If the record is a duplicate, then the IGNORE keyword tells MySQL to discard it silently without generating an error. Web13.2.5.2 INSERT ... ON DUPLICATE KEY UPDATE Statement. If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value … thin floral tape

mysql - On duplicate key do nothing - Database …

http://www.codebaoku.com/it-mysql/it-mysql-280833.html WebMar 27, 2011 · Ignore_duplicate _key is for use when creating a unique key on tables that already have data, in order to complete the process of building the constraint without failing due to historical bugs that insert duplicate rows, you can define the flag and the constraint will be build without checking the historical data. WebMar 5, 2014 · MySQL에는 아래 3가지 방법을 이용하여 중복 레코드를 관리할 수 있다. INSERT IGNORE ... REPLACE INTO ... INSERT INTO ... ON DUPLICATE UPDATE 각 방법의 특징을 요약하면 다음과 같다. 2. 사전 조건 중복 레코드 관리를 위해선 테이블에 PRIMARY KEY 혹은 UNIQUE INDEX 가 필요하다. 본 예제에서는 아래와 같은 person 테이블을 이용하여 설명한다. thin floral