SQL NULL's special, and you have to do WHERE field IS NULL , as NULL cannot be equal to anything,. including itself (ie: NULL = NULL is ... ... <看更多>

MySQL has Open Source License i.e. it has free GNU General Public License. SQL (Structured Query ... ... <看更多>

NULL is different from empty string '' and 0. Empty string as well as 0, are existing values that can be used in equations and other ... ... <看更多>

If JavaScript null is passed and converted to MySQL NULL, then the mysql module should process it like a regular SQL query that has NULL ... ... <看更多>

NULL. MySQL官方文档有如下的描述：. For NULL tables, NULL columns require additional space in the row to record whether their values are NULL ... ... <看更多>