WebIn MySQL, if you specify ON DUPLICATE KEY UPDATE and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is … WebThe synthetic ON DUPLICATE KEY UPDATE clause. The MySQL database supports a very convenient way to INSERT or UPDATE a record. This is a non-standard extension to the SQL syntax, which is supported by jOOQ and emulated in other RDBMS, where this is possible (e.g. if they support the SQL standard MERGE statement).Here is an example how to use …
REPLACE INTO vs ON DUPLICATE KEY UPDATE - PlaceOweb
1、当插入数据主键或者unique索引没有冲突: replace into和on duplicate key update的做法都是直接插入数据 2、出现主键或者unique索引冲突时: replace into :先删除此行数据,然后插入新的数据 on duplicate key update:只是执行update后面的语句属性的更新,其余属性不变。 参考MySQL官方文档 … See more 我们在向数据库里插入数据的时候,如果没有出现主键或者unique索引冲突,直接执行插入操作,而遇到冲突情况时需要将原有主键或者唯一索引所在的记录更新。 1 … See more 先创建一张测试表: 插入一条数据测试: 查看表数据: 执行replace into: 查看表数据: 现象:可以看到id的值增加了1,并且col2的值变为了NUll,说明在出现冲 … See more http://hzhcontrols.com/new-1398459.html target jalapeno chips
mysql中replace into(删除插入)/insert into on duplicate update(更 …
WebON DUPLICATE KEY UPDATE statements just shown can be done as shown here: INSERT INTO t1 SET a=1,b=2,c=3 AS new ON DUPLICATE KEY UPDATE c = new.a+new.b; INSERT … WebApr 12, 2024 · postgres -> create temp table t1(a int primary key, b int not null unique); CREATE TABLE postgres -> INSERT INTO t1 VALUES(5, 5) ON DUPLICATE KEY UPDATE … WebApr 15, 2024 · 获取验证码. 密码. 登录 顔 乾燥 ニキビ 対策