I\'m using Oracle 10g Express and trying to delete records from tables with bi-directional 开发者_JAVA百科constraints. I\'m trying to un-thread hundreds of tables and dependencies generated via Hibern
user_drug.user_id is constrained by Foreign Key drug.id (which is a Primary Key). Table structure is as follows:
I\'m working on implementing a function to prevent removal of certain elements in a database (through the front end) if they have other items associated with them in other tables. Otherwise those othe
Let\'s say, I have three tables: table1: contains various records; table2: contains what records have what options;
I\'m new user of Struts 2 w/ hibernate. I have 2 tables : \"Client\" and \"Coordonnees\" (french word)
In MySQL, I was advised to store the multiple choice options for \"Drugs\" as a separate table user_drug where each row is one of the options selected by a particular user.I was also advised to create
Problems with MySQL using InnoDB and dropping an unused, foreign key.The foreign key references another table\'s id.However, I don\'t need this field.
I have a table that has two optional foreign keys, each to a different table and one of which HAS to be filled in, but it doesn\'t matter which one.I was thinking about using a trigger to enforce this
MySQL 5.1.59 throws an error with this create table: CREATETABLE IF NOT EXISTS `genre` ( `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
i have a table \'users\' with a column \'id\'. this id is used as foreign key in many other tables (like posts, comments, etc.).
加载中,请稍侯......