how to make foreign key toad data modeler

The only difference would be in the constraint: create table Employees(Ĭonstraint PK_Employees primary key( ID ),Ĭonstraint CK_Employees_StoreType check( coalesce( StoreType, 'X' ) 'O' )), - Online not allowedĬonstraint FK_Employees_TransStores foreign key( StoreID, StoreType ) Now you want a reference from another table to TransactionalStores (and through it to the various store tables) but limited to Kiosks and BrickMorter. The Onlines and BrickMorters would have the same basic structure but with StoreType constrained to only 'O' or 'B' as appropriate. References TransactionalStores( ID, StoreType ) You don't show the layout of each table, so here is a typical design showing your relationships: create table TransactionalStores(Ĭonstraint CK_TransStoreType check( StoreType in( 'B', 'K', 'O' )),Ĭonstraint PK_TransactionalStores primary key( ID ),Ĭonstraint UQ_TransStoreTypes unique( ID, StoreType ) - for FK referencesĬonstraint CK_KioskStoreType check( StoreType = 'K' ), - kiosks onlyĬonstraint PK_Kiosks primary key( ID, StoreType ),Ĭonstraint FK_Kiosks_TransStores foreign key( ID, StoreType ) You should post these to /r/learnsql instead.Foreign keys can be made conditional.sort of. Note /r/SQL does not allow links to basic tutorials to be posted here. Please view the Wiki for online resources. Learning SQLĪ common question is how to learn SQL. SELECT count(a.field1), a.field2, SUM(b.field4) FROM a INNER JOIN b ON a.key1 = b.key1 WHERE a.field8 = 'test' GROUP by a.field1, a.field2 HAVING SUM(b.field4) > 5 ORDER by a.field.3įor those with SQL questions we recommend using SQLFiddle to provide a useful development and testing environment for those who wish to fully understand your problem and help devise a solution.

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How to make foreign key toad data modeler