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    <p>You need to do a conversion if your session parameter '<strong>NLS_DATE_FORMAT</strong>' is not '<strong>mm/dd/yyyy</strong>'.</p> <p>For example:</p> <pre><code>create table myTbl (id number, cdat date); select * from nls_session_parameters ns where ns.parameter = 'NLS_DATE_FORMAT'; PARAMETER VALUE ------------------------------------------------------- NLS_DATE_FORMAT DD-MON-RR </code></pre> <p>In this case, without a to_Date you'll get an error:</p> <pre><code>insert into myTbl values (123, '12/05/2011'); ORA-01843: not a valid month </code></pre> <p>You can change this paramter at session level, system level, etc.</p> <pre><code>zep@dev&gt; alter session set NLS_DATE_FORMAT = 'mm/dd/yyyy'; Session altered select * from nls_session_parameters ns where ns.parameter = 'NLS_DATE_FORMAT'; PARAMETER VALUE ------------------------------------------------------------------------------------- NLS_DATE_FORMAT mm/dd/yyyy insert into myTbl (id, cdat) values (123, '12/05/2011'); 1 row inserted zep@dev&gt; select * 2 from myTbl; ID CDAT ---------- ----------- 123 05/12/2011 </code></pre> <hr> <p><strong>Test on a row level trigger</strong></p> <pre><code>truncate table Mytbl; alter session set NLS_DATE_FORMAT = 'DD-MON-RR'; create or replace trigger befins_myTbl before insert on myTbl for each row declare begin -- demo :new.cdat := :new.cdat + numtoyminterval(1,'YEAR');-- (demo trigger add 1 year ) end; insert into myTbl (id, cdat) values (123, '12/05/2011'); </code></pre> <p><strong>Output</strong>: ORA-01843: <strong>not a valid month</strong></p> <pre><code>alter session set NLS_DATE_FORMAT = 'mm/dd/yyyy'; insert into myTbl (id, cdat) values (123, '12/05/2011'); commit; select * from myTbl; </code></pre> <p>Output</p> <pre><code>ID CDAT ---------- ----------- 123 12/05/2012 </code></pre>
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    1. POImplicit conversion of date field in a pl/sql trigger?
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    1. COHe was asking if he needed to do the conversion in the trigger. If the string can't be converted, the trigger will not run.
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    2. COthanks even tho is was not my question
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    3. CO@Allan Yes, I know, and I have pointed out where it is the problem! It isn't a problem related to a trigger, but instead it is related to the insert statement.
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