Bob, > I have a table, see below, that contains a single primary key (SubTestCaseKey ) and a number of foreign keys > > * plantriggers_ID_FK , > * testcase_root_ID_FK > * testcasesuffix_name_FK > > What I want to ensure is that there are no duplicate records when considering the three foreign keys above. Would it be appropriate to remove the single primary and replace with three multiple primary keys? Is there a performance impact when doing this. this seems overly complex and wonder if I should be breaking the table up to simplify? Any suggestions would be appreciated. >
There's no such thing as 3 primary keys. Why do you need "subtestcasekey"? If the foreign key columns should be unique, why not make those 3 columns the primary key? With regards, Martijn Tonies Database Workbench - tool for InterBase, Firebird, MySQL, Oracle & MS SQL Server Upscene Productions http://www.upscene.com > Bob > > CREATE TABLE testplans ( > SubTestCaseKey INTEGER NOT NULL AUTO_INCREMENT, > plantriggers_ID_FK INTEGER UNSIGNED NOT NULL, > testcase_root_ID_FK INTEGER NOT NULL, > testcasesuffix_name_FK VARCHAR(20) NULL, > FSAGA ENUM('FSA1','FSA2','GA') NULL DEFAULT 'GA', > Priority ENUM('P1','P2','P3','Do Not Run') NULL DEFAULT 'Do Not Run', > DateMod TIMESTAMP NULL, > tester_list_Name_FK VARCHAR(50) NULL, > PRIMARY KEY(SubTestCaseKey), > INDEX testplans_FKIndex1(tester_list_Name_FK), > INDEX testplans_FKIndex2(testcasesuffix_name_FK), > INDEX testplans_FKIndex3(testcase_root_ID_FK), > INDEX testplans_FKIndex4(plantriggers_ID_FK), > FOREIGN KEY(tester_list_Name_FK) > REFERENCES tester_list(Name) > ON DELETE RESTRICT > ON UPDATE CASCADE, > FOREIGN KEY(testcasesuffix_name_FK) > REFERENCES testcasesuffix(name) > ON DELETE RESTRICT > ON UPDATE CASCADE, > FOREIGN KEY(testcase_root_ID_FK) > REFERENCES testcase_root(ID) > ON DELETE RESTRICT > ON UPDATE CASCADE, > FOREIGN KEY(plantriggers_ID_FK) > REFERENCES plantriggers(ID) > ON DELETE RESTRICT > ON UPDATE CASCADE > ) > TYPE=InnoDB; -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
