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REPLACE works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is inserted. See Section 15.2.7, “INSERT Statement”. REPLACE is a MySQL extension to the SQL standard.
- 15.1.9.3 ALTER TABLE Examples
To add a new AUTO_INCREMENT integer column named c: ALTER...
- 15.1.9.3 ALTER TABLE Examples
For example, use DROP PRIMARY KEY or DROP FOREIGN KEY to drop a primary key or foreign key. If a table alteration causes a violation of an enforced CHECK constraint, an error occurs and the table is not modified.
22 sie 2006 · When using ALGORITHM = INPLACE, MySQL/MariaDB automatically modifies the foreign key constraint. See https://dev.mysql.com/doc/refman/8.4/en/innodb-online-ddl-operations.html#online-ddl-column-operations "Renaming a column"
14 maj 2024 · This error code 6125 (ER_FK_NO_UNIQUE_INDEX_PARENT) was newly introduced in 8.4.0. For now, you can disable this restriction and restore the pre-8.4.0 behavior by setting the new restrict_fk_on_non_standard_key server variable to OFF.
To add a new AUTO_INCREMENT integer column named c: ALTER TABLE t2 ADD c INT UNSIGNED NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY (c); We indexed c (as a PRIMARY. KEY) because AUTO_INCREMENT columns must be indexed, and we declare c as NOT NULL because primary key columns cannot be NULL.
6 lip 2024 · You could use the CHANGE REPLICATION SOURCE TO Statement syntax. CHANGE REPLICATION SOURCE TO SOURCE_HOST='source2.example.com', SOURCE_USER='replication', SOURCE_PASSWORD='password', SOURCE_PORT=3306, SOURCE_LOG_FILE='source2-bin.001', SOURCE_LOG_POS=4, GET_SOURCE_PUBLIC_KEY=1, SOURCE_CONNECT_RETRY=10;
If you use it, MySQL ignores primary-key or unique-key violations and continues processing with the next row. See the section for the statement that you are using (Section 15.2.7, “INSERT Statement”, Section 15.2.17, “UPDATE Statement”, and so forth).
