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Create MySQL Database and User
Below are the steps to create a MySQL database and add a user CREATE DATABASE testdb CHARACTER SET utf8 COLLATE utf8_general_ci; GRANT ALL PRIVILEGES ON testdb.* TO 'testuser'@'127.0.0.1' IDENTIFIED...
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MySQL Drop Unique Constraint
In MySQL 5.0 it is possible to drop unqiue constraints but, the syntax is not incredibly intuitive. alter table TABLE_NAME drop index UNIQUE_CONSTRAINT_NAME; Code Ghar provides a more thorough...
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MySQL Increase Column Size
An example of modifying a MySQL table to increase a VARCHAR column size: alter table TABLE_NAME modify COLUMN_NAME VARCHAR(1024) NOT NULL; This increases COLUMN_NAME to 1024 characters.
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Rebuild An InnoDB Table Index
Rebuilding an InnoDB table index is easy in MySQL 5.0. Simply type: mysql> ALTER TABLE table_name ENGINE=InnoDB; Warning: When dealing with large databases, this can place a lot of load on your DB.
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MySQL Update Table Limit Rows
Updating a block of rows in MySQL can be accompished by using the “limit” function: update TABLE_NAME set COLUMN_NAME=VALUE limit MAX; E.g. update products set state=false limit 10;
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MySQL and Negative Infinity
Storing and retrieving negative infinity in a MySQL database is accomplished by inserting an arbitrarily large negative number. Negative infinity is handy when storing default values in a database....
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