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Editorial Team
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Asked: 2026-05-14T04:38:56+00:00

I am trying to enforce a CHECK Constraint in a ORACLE Database on multiple

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I am trying to enforce a CHECK Constraint in a ORACLE Database on multiple tables

CREATE TABLE RollingStocks ( 
  Id NUMBER,
  Name Varchar2(80) NOT NULL,           
  RollingStockCategoryId NUMBER NOT NULL,            
  CONSTRAINT Pk_RollingStocks Primary Key (Id),
  CONSTRAINT Check_RollingStocks_CategoryId  
  CHECK ((RollingStockCategoryId  IN (SELECT Id FROM FreightWagonTypes)) 
        OR 
        (RollingStockCategoryId  IN (SELECT Id FROM LocomotiveClasses)))       
);

…but i get the following error:

*Cause: Subquery is not allowed here in the statement.
*Action: Remove the subquery from the statement.

Can you help me understanding what is the problem or how to achieve the same result?

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1 Answer

  1. Editorial Team

    Check constraints are very limited in Oracle. To do a check like you propose, you’d have to implement a PL/SQL trigger.

    My advise would be to avoid triggers altogether. Implement a stored procedure that modifies the database and includes the checks. Stored procedures are easier to maintain, although they are slightly harder to implement. But changing a front end from direct table access to stored procedure access pays back many times in the long run.

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