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POCan not add table constraint for sdate >= bdate in Oracle
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19784693
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2013-11-05T08:36:33.627
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Here's the table schema: <pre><code>create table EMPLOYEE (fname /* Employee's first name */ varchar(15) not null, init /* Employee's middle initial */ char(1), lname /* Employee's last name */ varchar(15) not null, IRD /* Employee's IRD number */ varchar(10) not null primary key, sex /* Employee's sex */ char(1) constraint check_sex check (sex in ('f','m','F','M')), bdate /* Employee's birthdate */ date, office /* Employee's office */ varchar(5), reg_org /* The number of the registration office the employee works for */ varchar(10), sdate /* Starting date in the organization */ date); </code></pre> Then I think it make sense to add the constraint <pre><code>alter table employee add constraint ck_date check (sdate >= bate); </code></pre> but it gives me an error <pre><code>add constraint ck_date check (sdate >= bdate) * ERROR at line 2: ORA-02293: cannot validate (SYSTEM.CK_DATE) - check constraint violated </code></pre> Anyone know where I go wrong? <hr> update the data of the two columns SQL> select bdate, sdate from employee; <pre><code>BDATE SDATE --------- --------- 21-JAN-58 22-FEB-10 21-MAY-70 17-MAR-09 09-NOV-47 12-MAY-08 10-OCT-53 15-JUN-09 01-OCT-56 01-OCT-05 </code></pre> <hr> <pre><code>SQL> select to_char(bdate, 'yyyy-mm-dd') as bdate, to_char(sdate,'yyyy-mm-dd') from employee; BDATE TO_CHAR(SD ---------- ---------- 1958-01-21 2010-02-22 1970-05-21 2009-03-17 2047-11-09 2008-05-12 1953-10-10 2009-06-15 1956-10-01 2005-10-01 </code></pre> <hr> <hr>
Tags
<sql><oracle><constraints>
Title
Can not add table constraint for sdate >= bdate in Oracle
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PostAcceptedAnswerId
1. PO
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1. USmko
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