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Asked: 2026-05-11T06:01:02+00:00

I am just beginning to learn SQL and have stumbled at the first hurdle,

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I am just beginning to learn SQL and have stumbled at the first hurdle, I am unable to create a table. Below is the code example. The error I am receiving when running the statement, references line 7 stating there is an issue with a ‘relational operator’. The purpose of line 7 is to check that the age of the person is greater than 18.

I am using Oracle (unsure if that will make a difference). I hope someone can point me in the correct direction.

1.  CREATE TABLE employee 2.  ( 3.  empID         VARCHAR2(20) NOT NULL primary key, 4.  surname       VARCHAR2(15) NOT NULL CHECK(surname=UPPER(surname)), 5.  deptCode      CHAR(5) NOT NULL CHECK(deptCode=UPPER(deptCode)), 6.  empYear       NUMBER(1,0) NOT NULL CHECK(empYear >= 1 AND empYear <= 4), 7.  birthDate     DATE NOT NULL CHECK((SYSDATE - birthDate) /365 ) >= 18 8.  );

Thank you.

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1 Answer

  1. You cannot define a CHECK constraint that references a function like SYSDATE.

    The Oracle documentation has a discussion on the restrictions on CHECK constraints

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