wpdb in WordPress: Complete Guide to the Global Database Object
Learn how to use the wpdb global object in WordPress with practical examples, security tips, and best practices for database queries.
In MySQL the default value of a column should be null or empty? What are the pros and cons?
In MySQL, when defining a column, you have the option to set a default value. Whether you should set it to NULL or an empty value (0 in the case of INTEGER) depends on your specific use case and requirements. Here are the pros and cons of each approach: Setting the default value to NULL:
Lock MYSQL tables before exporting tables
Ensure a consistent snapshot by executing this statement to lock the tables so that they cannot be modified during export: mysql> FLUSH TABLES hr.employees, hr.managers WITH READ LOCK; While the lock is in effect, the tables can still be used, but only for read access. Unlock the tables: mysql> UNLOCK TABLES;