皆さんは、UPSERT処理という言葉をご存知でしょうか。UPDATEとINSERTを合わせた言葉で、INSERTをする際に、すでにそのデータが存在していない場合はINSERTを行って、その行がある場合はUPDATEを行うという処理になります。 今回は、MySQLでUPSERT処理を実現する方法 ...

For database developers and managers, this change shouldn't be a problem. MariaDB, a MySQL fork founded by the original MySQL developers, is designed to be a drop-in replacement for the MySQL Database ...

When you want to replace a string from other string in a string then you can use REPLACE function. REPLACE function returns the string str with all occurrences of the string from Str and replace it by ...

MySQL 8.0 brings a lot of new features. These features make MySQL database much more secure (like new authentication, secure password policies and management, …) and fault tolerant (new data ...

MySQL table primary keys and unique indexes prevent multiple rows with the same index from being added to the table. If you try to insert a duplicate row with a ...

SQLyog is available in three major versions: Professional, Enterprise and Ultimate. Differences among the three versions primarily lie in the number of included features such as data migration, ...

# MySQL Handshake packet ( .\0\0\0\x0a ) reference - http://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::Handshake # Error packet ...