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If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site. my story is that i do so much updates on the staging database, Faculty table, change lots of faculty comment and name without changing Class table.When I try to do an update on either table, I get a 'The UPDATE statement conflicted with the REFERENCE constraint..' which refers to the foreign key constraint.How can I update the language field on both of these tables?A FOREIGN KEY is a key used to link two tables together.A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.Also, it is interesting to note that while this query works (Note the PRIMARY KEY line): CREATE TABLE `ffxi_character Job` ( `server ID` int(11) NOT NULL, `userid` int(10)unsigned NOT NULL, `character Name` varchar(255) NOT NULL, `job Abbr` char(4) NOT NULL, `job Level` int(11) default '0', PRIMARY KEY (`server ID`,`userid`,`character Name`,`job Abbr`), INDEX (`job Abbr`), CONSTRAINT FOREIGN KEY (`server ID`,`userid`,`character Name`) REFERENCES `ffxi_characters` (`server ID`,`userid`,`character Name`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT FOREIGN KEY (`job Abbr`) REFERENCES `ffxi_job Type` (`job Abbr`) ON DELETE CASCADE ON UPDATE CASCADE) TYPE=Inno DB; This query will give you an error 1005 and errno 150: CREATE TABLE `ffxi_character Job` ( `server ID` int(11) NOT NULL, `userid` int(10)unsigned NOT NULL, `character Name` varchar(255) NOT NULL, `job Abbr` char(4) NOT NULL, `job Level` int(11) default '0', PRIMARY KEY (`job Abbr`,`server ID`,`userid`,`character Name`), INDEX (`job Abbr`), CONSTRAINT FOREIGN KEY (`server ID`,`userid`,`character Name`) REFERENCES `ffxi_characters` (`server ID`,`userid`,`character Name`) ON DELETE CASCADE ON UPDATE CASCADE, CONSTRAINT FOREIGN KEY (`job Abbr`) REFERENCES `ffxi_job Type` (`job Abbr`) ON DELETE CASCADE ON UPDATE CASCADE) TYPE=Inno DB; In order to make the second one work, you have to add: INDEX (`server ID`,`userid`,`character Name`)before the the foreign key is made.In a previous comment Dennis Haney provided an SQL snippet for finding rows that violate intended foreign key constraints.

Look at the following two tables: "Persons" table: Notice that the "Person ID" column in the "Orders" table points to the "Person ID" column in the "Persons" table.While implementing update and delete operations on values in the parent table (referenced table with primary key) we have to consider the impact on related values in the child table.SQL Server provides different rules for managing the effect of updates and deletes on child table values.Then each store must have a top general manager in charge which is stationed there, so the store will have an Employee ID Foreign Key to the store table to represent that the store has that employee as the manager.In this case, you have Store ID as an attribute of Employee, and Employee ID (the Manager) as an attribute of Store. There are likely better ways to handle such cases, but if your business rules requires such circular dependencies, then it happens.PDF (US Ltr) - 37.5Mb PDF (A4) - 37.5Mb PDF (RPM) - 36.9Mb HTML Download (TGZ) - 10.2Mb HTML Download (Zip) - 10.2Mb HTML Download (RPM) - 8.9Mb Man Pages (TGZ) - 211.3Kb Man Pages (Zip) - 321.0Kb Info (Gzip) - 3.4Mb Info (Zip) - 3.4Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 storage engine's handling of foreign keys as compared with that of the My SQL Server.For foreign key usage information and examples, see Section 13.1.18.6, “Using FOREIGN KEY Constraints”.You find the rows like this:select from child left join parent on (child.parent_id=parent.id) where is not null and is null; There may be rare cases where circular dependencies would make sense.In the case of employees and store, you may have a circular dependency; in which all employees must be stationed at a store, so the employees table will have store ID and Employee ID attached as a concatonated primary key (Presuming that an Employee can only have one store stationed) or even just a simple non-dependent foriegn key.don't want to do that if this is a common operation.An admittedly ugly alternative is to: - Create a row in the parent table, based on the row to be updated but containing the new foreign key value - Update all child rows where the foreign key contains the old value with the new value.