Mysql insert on duplicate key update how to#
Mysql insert on duplicate key update install#
Mysql insert on duplicate key update serial#
Mysql insert on duplicate key update update#
Mysql insert on duplicate key update driver#

Mysql insert on duplicate key update driver#

Laravel: PDOException: could not find driver.MySql ERROR 1045 (28000): Access denied for user (using password: NO).Your password does not satisfy the current policy requirements.Hibernate Error executing DDL via JDBC Statement.PDO::_construct(): Server sent charset (255) unknown to the client.Access denied you need (at least one of) the SUPER privilege(s) for this operation.

Mysql insert on duplicate key update how to#

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select rows in sql with latest date for each ID repeated multiple times.

Mysql insert on duplicate key update install#

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Anyone with real-world data would be more than welcome to contribute it. Since this was all performed on a fresh table with nearly no data and not in production, the times for execution were microscopic and irrelevant.

Mysql insert on duplicate key update update#

I deleted everything except (1,1) so I could test from the same playing field INSERT INTO users_partners (uid,pid) VALUES (1,1),(1,2),(1,3),(1,4) ON DUPLICATE KEY UPDATE uid=uid No other messages were generated in console, and it now has those 4 values in the table data. Note, the above saved too much extra work by setting the column equal to itself, no update actually needed REPLACE INTO users_partners (uid,pid) VALUES (1,1)Īnd now some multiple row tests: INSERT INTO users_partners (uid,pid) VALUES (1,1),(1,2),(1,3),(1,4) INSERT INTO users_partners (uid,pid) VALUES (1,1) ON DUPLICATE KEY UPDATE uid=uid INSERT IGNORE INTO users_partners (uid,pid) VALUES (1,1) INSERT INTO users_partners (uid,pid) VALUES (1,1) Let's begin: INSERT INTO users_partners (uid,pid) VALUES (1,1) Primary key is based on both columns of this quick reference table. In case you want to see what this all means, here is a blow-by-blow of everything: CREATE TABLE `users_partners` ( Whereas REPLACE does delete the original row and inserts a new row, generating and storing a new auto-increment id: mysql> select * from foo Note the AUTO_INCREMENT=3 indicates an id was generated, but not used in the row. The above demonstrates that the IODKU statement detects the duplicate, and invokes the update to change the value of u. ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1 Mysql> insert into foo (u) values (10) on duplicate key update u = 20 ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

Mysql insert on duplicate key update serial#

The configuration variable innodb_autoinc_lock_mode=1 (the default): mysql> create table foo (id serial primary key, u int, unique key (u)) See demonstration below, tested with Percona Server 5.5.28. It's true that the new id is generated, but it is not used in the changed row. The edit tried to add a claim that INSERT.ON DUPLICATE KEY UPDATE causes a new auto-increment id to be allocated. ANSI SQL 2003 defines a MERGE statement that can solve the same need (and more), but MySQL does not support the MERGE statement.Ī user tried to edit this post (the edit was rejected by moderators). Side effects are propagated to replicas too.Ĭorrection: both REPLACE and INSERT.ON DUPLICATE KEY UPDATE are non-standard, proprietary inventions specific to MySQL.

Triggers that fire on DELETE are executed unnecessarily.Dependent rows with foreign keys may be deleted (if you use cascading foreign keys) or else prevent the REPLACE.If you use REPLACE, MySQL actually does a DELETE followed by an INSERT internally, which has some unexpected side effects: Inserting a row to a partitioned table, but the values you insert don't map to a partition.

Inserting a NULL into a column with a NOT NULL constraint.Inserting a duplicate key in columns with PRIMARY KEY or UNIQUE constraints.But the statement won't generate an error. If you use INSERT IGNORE, then the row won't actually be inserted if it results in a duplicate key. I would recommend using INSERT.ON DUPLICATE KEY UPDATE.