Learn how to use CREATE TABLE, ALTER TABLE, and CONSTRAINT to create, modify, and view primary and foreign keys in SQL DB2 tables.

Question, if I'm truncating tables I need to take care of any foreign key constraints before doing so. Is it better to Drop, Truncate and Add back the Foreign Key or Disable it through some ...

By using cascading referential integrity constraints, you can define the actions that SQL Server 2005 takes when a user tries to delete or update a key to which existing foreign keys point.

Then the individual table files a included. And finally all of the constraints are recreated. In commit 5edc4e5 (which you suggested earlier today :)) I get an output.sql where the individual table ...

mysql> ALTER TABLE `UserRoleCompanie` ADD COLUMN `companieId` char(25) CHARACTER SET utf8 NOT NULL; Query OK, 0 rows affected (0.32 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE ...

Foreign key 'geneassay_fk' references invalid column 'geneassay' in referencing table 'b_SequencingData_seq'. Msg 1750, Level 16, State 0, Line 43 Could not create constraint.