Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>There isn't really a default date format for the product, the <a href="http://docs.oracle.com/cd/E11882_01/server.112/e25513/initparams145.htm" rel="nofollow">reference guide</a> states that the default for <code>NLS_DATE_FORMAT</code> at system level is based on <code>NLS_TERRITORY</code>. Though <a href="http://docs.oracle.com/cd/E11882_01/appdev.112/e25518/adfns_sqltypes.htm#sthref271" rel="nofollow">this</a> says the 'standard' is `DD-MON-RR', and I think that's what you get if you don't specify a value at database level, at least on the platforms I've worked on.</p> <p>When you create a new database the initialisation parameters can include a specific <code>NLS_DATE_FORMAT</code>, and that can be changed later too.</p> <p>But the system-level <code>NLS_DATE_FORMAT</code> can be overridden by the client, the session, or in a <code>TO_CHAR</code> call. You can look in <code>v$nls_parameters</code> to see the system value, and <code>nls_session_parameters</code> to see your current session value. You can change that with <code>alter session</code> if you want to.</p> <p>I'm pretty sure you'll find that PL/SQL Developer is setting the session <code>NLS_DATE_FORMAT</code> to <code>MM/DD/YYYY</code> somewhere in its preferences.</p> <p>Generally it's better to not rely on that value at all, and always use an explicit format mask for display, e.g. <code>TO_CHAR(&lt;column&gt;, 'YYYY-MM-DD HH24:MI:SS')</code>.</p> <p>There's more on <code>NLS_DATE_FORMAT</code> in the globalisation guide <a href="http://docs.oracle.com/cd/E11882_01/server.112/e10729/ch4datetime.htm#i1006547" rel="nofollow">here</a> and <a href="http://docs.oracle.com/cd/E11882_01/server.112/e10729/ch3globenv.htm#i1006817" rel="nofollow">here</a>; and a bit about date display <a href="http://docs.oracle.com/cd/E11882_01/server.112/e25789/tablecls.htm#sthref145" rel="nofollow">here</a>; and an overview of the date format model elements <a href="http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements004.htm#i34924" rel="nofollow">here</a></p>
    singulars
    1. This table or related slice is empty.
    1. POOracle Date format
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAlex Poole
    1. USAlex Poole
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIf this is the case then why I have to use specific format while comparision of dates: Eg. select si.effective_date from search_instance si where si.effective_date > '26-JUN-2013' order by si.effective_date . If instead of '26-JUN-2013' I use '06/26/2013' it will say 'Not a valid Month'.
      singulars
      1. PO
      1. USuser204069
    2. COTo answer your comment please read my answer [here](http://stackoverflow.com/questions/10178292/comparing-dates-in-oracle-sql/10178346#10178346) or [here](http://stackoverflow.com/questions/15970277/comparing-with-date-in-oracle-sql/15970516#15970516) (I'm sure Alex has as many) @user204069... You're ***not*** comparing dates there, you're comparing strings. _Always_ explicitly convert strings to a date for date comparisons.
      singulars
      1. PO
      1. USBen
    3. CO@user204069 - what is your session value? You're doing an implicit conversion from a string to a date, which you should avoid as it's ambiguous. You should use `to_date('06/26/2013', 'MM/DD/YYYY')`. Or possibly `date '2013-06-26'`, using an ANSI date literal.
      singulars
      1. PO
      1. USAlex Poole
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload