Empty string and NULL value

Hi,
Does oracle treat empty string as NULL.
If it is so,Can we force db to treat both as different things.
Thanx

11g.DBA wrote:
Hi,
Does oracle treat empty string as NULL.Yes.
If it is so,Can we force db to treat both as different things.No.
Please read in SQL Reference:
http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements005.htm#SQLRF3003

Similar Messages

Distinguishing between empty string and null values

hi all,
I am using an ODBC connection to connect my java app to database using JDBCODBC driver. I have 2 columns 'aColumn' and 'bColumn' in my table, both allow null values. I have one row in it, which has null value in aColumn and empty string in bColumn. I retrieve this row's data and assign it to 2 columns : 'aColumnVar' and 'bColumnVar' respectively. I find out that both 'aColumnVar' and 'bColumnVar' variables has null values (although bColumnVar should has an empty string as its value). Now my ODBC connection Data Source has the option "Use ANSI nulls, paddings, and warnings" ON. I turn it off and try again. This time both 'aColumnVar' and 'bColumnVar' variables has empty string as values (although aColumnVar should has null as its value).
How can I make sure that i can get the data exactly as it is in the database in my variables?
Thanks

there is a wasNull() method on ResultSet. After you
have obtained the value of a column e.g. by calling a
method like getString you can call wasNull and if it
returns true then the value on the database is null.
Check the java docs, it might explain it better
http://java.sun.com/j2se/1.4.1/docs/api/java/sql/Result
et.html#wasNull()I am using MS SQL Server 7.0 under Windows NT 4.0 with JDK 1.2. My ODBC connection Data Source has to have the option "Use ANSI nulls, paddings, and warnings" ON.
I try the wasNull() method but it is doing the same thing i.e. telling me that a column is null when in database it is null (right); and a column is null when in database it is an empty string (wrong). I suspect it is something to do with the JDBC-ODBC driver I am using.

How to check empty string and null? Assign same value to multiple variables

Hi,
1.
How do I check for empty string and null?
in_value IN VARCHAR2
2. Also how do I assign same value to multiple variables?
var_one NUMBER := 0;
var_two NUMBER := 0;
var_one := var_two := 0; --- Gives an error
Thanks

MichaelS wrote:
Not always: Beware of CHAR's:
Bug 727361: ZERO-LENGTH STRING DOES NOT RETURN NULL WHEN USED WITH CHAR DATA TYPE IN PL/SQL:
SQL> declare
2    l_str1   char (10) := '';
3    l_str2   char (10) := null;
4 begin
5
6    if l_str1 is null
7    then
8      dbms_output.put_line ('oh STR1 is null');
9    elsif l_str1 is not null
10    then
11      dbms_output.put_line ('oh STR1 is NOT null');
12    end if;
13
14    if l_str2 is null
15    then
16      dbms_output.put_line ('oh STR2 is null');
17    elsif l_str2 is not null
18    then
19      dbms_output.put_line ('oh STR2 is NOT null');
20    end if;
21 end;
22 /
oh STR1 is NOT null
oh STR2 is null
PL/SQL procedure successfully completed.
SQL> alter session set events '10932 trace name context forever, level 16384';
Session altered.
SQL> declare
2    l_str1   char (10) := '';
3    l_str2   char (10) := null;
4 begin
5
6    if l_str1 is null
7    then
8      dbms_output.put_line ('oh STR1 is null');
9    elsif l_str1 is not null
10    then
11      dbms_output.put_line ('oh STR1 is NOT null');
12    end if;
13
14    if l_str2 is null
15    then
16      dbms_output.put_line ('oh STR2 is null');
17    elsif l_str2 is not null
18    then
19      dbms_output.put_line ('oh STR2 is NOT null');
20    end if;
21 end;
22 /
oh STR1 is null
oh STR2 is null
PL/SQL procedure successfully completed.
SQL> SY.

How to differentiate the EMPTY Records and Null Values in DSO

Hello....how is everyone here?? Ehehehe!
I try to load some data from the flat file which contains some EMPTY data and Null Values for the records. The data type for the InfoObjects of the fields "Quantity" is "number". The sample data from the flat file (CSV) are as below:
Food              Quantity
Hamburger -       12
Cheese        -       0
Vegetable      -               (Empty)
When I try to load the above sample data to the DSO, I get the results of the data as follow:
Food              Quantity
Hamburger     - 12.000
Cheese           - 0.000
Vegetable         - 0.000
In this case, how can the user differentiate whether the records is contain empty value of null values in DSO? This is kinda of hard to differentiate the both scenarios above. Is there any way to differentiate the scenarios described here?
Thanks alot =)

Hi Fluffy,
It depends on the initial values of the data type
The inital values For quantity/Currency/ Numbers it takes spaces as 0
for char it is SPACE
We cannot differeniate between space and null values.
IF you have to force this then define quantity as char and load the data. we will not have units and aggregation in this case.
Hope this helps.
PV

Varchar2, empty strings and NULL

Hi all,
When inserting an empty string into a column of type varchar2 - is a NULL value stored in the column by the database? I've seen conflicting reports, and I know that the SQL 1992 spec specifies that empty strings not be treated as a NULL value, but that Oracle has traditionally treated zero length strings stored in a varchar2 column as NULL.
So, is there a way to store an empty string in a varchar2 column as an empty string and not a NULL value?
TIA,
Seth

It can be even more complicated or annoying than NULL not equal to ASCII NULL.
example:
create table test_null
(fld1 varchar2(10),
fld2 varchar2(10),
fld3 varchar2(20));
insert into test_null values (chr(0),null, 'chr(0) and null');
insert into test_null values (null, null, 'null and null');
insert into test_null values ('', chr(0), ''''' and chr(0)');
insert into test_null values ('', null, ''''' and null');
select * from test_null;
FLD1       FLD2       FLD3
                      chr(0) and null
                      null and null
                      '' and chr(0)
                      '' and null
1 DECLARE
2 BEGIN
3   for c1 in (select fld1, fld2, fld3 from test_null) loop
4      if c1.fld1 = c1.fld2 then
5         dbms_output.put_line(c1.fld3||' Are equal'||
6                ' Length fld1 = '||to_char(length(c1.fld1))||
7                ' Length fld2 = '||to_char(length(c1.fld2)));
8      else
9         dbms_output.put_line(c1.fld3||' Are NOT equal'||
10                ' Length fld1 = '||to_char(length(c1.fld1))||
11                ' Length fld2 = '||to_char(length(c1.fld2)));
12      end if;
13      dbms_output.put_line(' ');
14   end loop;
15* END;
SQL> /
chr(0) and null Are NOT equal Length fld1 = 1 Length fld2 =
null and null Are NOT equal Length fld1 = Length fld2 =
'' and chr(0) Are NOT equal Length fld1 = Length fld2 = 1
'' and null Are NOT equal Length fld1 = Length fld2 =
PL/SQL procedure successfully completed.

Is empty string and Null same?

create table x
(empid number);
Table created.
insert into x values ('');
1 row created.
insert into x values (null);
1 row created.
SQL> set null <<>>
SQL> select * from x;
     EMPID
<<>>
<<>>So i can safely change an Insert statement like
insert into x values ('');to
insert into x values (null);Right?

michaels2 wrote:
char pads with spaces to the length of the data itemdon't think so - at least not on my 11.2.0.1.0Good. Oracle finally fixed it. Before 11.2 it was pretty much as ajallen noted:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
SET SERVEROUTPUT ON
DECLARE
    flag CHAR(2);
    PROCEDURE check_null (p_flag IN CHAR)
    IS
    BEGIN
      IF p_flag = ' '
        THEN
          dbms_output.put_line ('flag is equal to '' ''');
        ELSIF p_flag IS NULL
          THEN
            dbms_output.put_line ('flag is null');
        ELSE
          dbms_output.put_line ('other');
      END IF;
    END;
BEGIN
    flag := '';
    check_null (flag);
    flag := NULL;
    check_null (flag);
END;
flag is equal to ' '
flag is null
PL/SQL procedure successfully completed.
alter session set events '10932 trace name context forever, level 16384';
DECLARE
    flag CHAR(2);
    PROCEDURE check_null (p_flag IN CHAR)
    IS
    BEGIN
      IF p_flag = ' '
        THEN
          dbms_output.put_line ('flag is equal to '' ''');
        ELSIF p_flag IS NULL
          THEN
            dbms_output.put_line ('flag is null');
        ELSE
          dbms_output.put_line ('other');
      END IF;
    END;
BEGIN
    flag := '';
    check_null (flag);
    flag := NULL;
    check_null (flag);
END;
flag is null
flag is null
PL/SQL procedure successfully completed.
SQL>
Bug 727361: ZERO-LENGTH STRING DOES NOT RETURN NULL WHEN USED WITH CHAR DATA TYPE IN PL/SQL
SY.

ORACLE treats empty Strings as NULL, Any workaround?

Hi,
ORACLE treats empty Strings as NULL.
I am writing, rather modifying Java code to make it work with both SQLServer and Oracle. Since our code is already working for SQLServer, now I have the problem in porting to Oracle wherever I have empty strings. I used to insert empty strings into coulumns in SQLServers, the same SQLs give errors in SQL Server.
Any workaround on the DB end or in JDBC for this?
Thanks in advance,
Suresh
[email protected]

jschell wrote:
nichele wrote:
jwenting wrote:
If NULL really is different in your context from an empty string you're going to have to define some sequence of characters as indicating an empty string.yes, this is what i need to implement.Sounds like a flawed design then.
I'm wondering what's the best approach in order to avoid to change all my application isolating this behavior somewhere (wrapping the jdbc driver for instance).That doesn't make much sense to me. You should already have a database layer. You change the database layer. If you don't have a database layer then that means you have another design flaw. And in that case I would really not be the one that needs to maintain that code base.I thought a bit about the value of your answer...but i didn't find it ....sorry but i don't like who replies on forum just to say bad design/bad choice etc...if you have any kind of suggestion you are welcome, otherwise you can spend your time in doing something else instead of reply to this thread.

JDBC Receiver does not convert empty string to NULL

Hello experts,
I am facing a problem with an INSERT statement to ORACLE DB where some of the fields are empty, for example:
- <STATEMENT_VLP_CONT_DETAILS>
- <TABLE_VLP_CONT_DETAILS ACTION="INSERT">
<TABLE>VLP_CONT_DETAILS</TABLE>
- <ACCESS>
<VLP_HDR_ID>43</VLP_HDR_ID>
<VLP_CONT_LINE_ID>1</VLP_CONT_LINE_ID>
<QUANTITY>1</QUANTITY>
<OWNER>CBHU</OWNER>
<SERIAL_NO>3372739</SERIAL_NO>
<CONT_ISO_CODE>2300</CONT_ISO_CODE>
<WEIGHT>6.44</WEIGHT>
<POL>ILASH</POL>
<POD>FRFOS</POD>
<FD>FRFOS</FD>
<OPER_CODE>COS</OPER_CODE>
<CUR_STOW_LOC>150102</CUR_STOW_LOC>
<PRV_STOW_LOC />
<HAZARDOUS>N</HAZARDOUS>
In the JDBC Receiver comm channel I selected: Interpretation of Empty String Values = NULL Value.
It seems the empty strings are not converted to NULL values as can be seen in the reflected SQL statement in RWB:
INSERT INTO VLP_CONT_DETAILS (VLP_HDR_ID, VLP_CONT_LINE_ID, QUANTITY, OWNER, SERIAL_NO, CONT_ISO_CODE, WEIGHT, POL, POD, FD, OPER_CODE, CUR_STOW_LOC, PRV_STOW_LOC, HAZARDOUS, EMPTY, REFER, OOG, HAZARD_IMDG, TEMP_SET, TEMP_MIN, TEMP_MAX, FRONT_OVL, REAR_OVL, RIGHT_OVW, LEFT_OVW, OVERHEIGHT, COMMODITY, BOOKING_REF, ALLOTMENT, YARD_LOC, LD_SEQ_CRANEID, LD_SEQ_NUMBER, LD_STATUS, STACKABLE, OPT_PORT_CODE1, OPT_PORT_CODE2, OPT_PORT_CODE3) VALUES (44, 1, 1, CBHU, 3372739 , 2300, 6.44, ILASH, FRFOS, FRFOS, COS, 150102, , N, N, N, N, , , , , , , , , , , , , , , 0, 64, N, , , )
So, I am getting the following error:
Could not execute statement for table/stored proc. "VLP_CONT_DETAILS" (structure "STATEMENT_VLP_CONT_DETAILS") due to java.sql.SQLException: ORA-00936: missing expression
Help would be appreciated.

Hi Effi,
There is a mismatch in the field and thier value.
Here field id 37
VLP_HDR_ID, VLP_CONT_LINE_ID, QUANTITY, OWNER, SERIAL_NO, CONT_ISO_CODE, WEIGHT, POL, POD, FD, OPER_CODE, CUR_STOW_LOC, PRV_STOW_LOC, HAZARDOUS, EMPTY, REFER, OOG, HAZARD_IMDG, TEMP_SET, TEMP_MIN, TEMP_MAX, FRONT_OVL, REAR_OVL, RIGHT_OVW, LEFT_OVW, OVERHEIGHT, COMMODITY, BOOKING_REF, ALLOTMENT, YARD_LOC, LD_SEQ_CRANEID, LD_SEQ_NUMBER, LD_STATUS, STACKABLE, OPT_PORT_CODE1, OPT_PORT_CODE2, OPT_PORT_CODE3
And value is 35
44, 1, 1, CBHU, 3372739 , 2300, 6.44, ILASH, FRFOS, FRFOS, COS, 150102, , N, N, N, N, , , , , , , , , , , , , , , 0, 64, N, , ,
Give empty values for nuil fields so that they can be made NULL by jdbc adapter
Regards
Suraj

About xml and null values in 10g

Hi, I have an UCM GetFile webservice component wich receives 4 arguments, two of them are null values (rendition and extraPops), and the xml request generated by obpm is:
<GetFileByName xmlns="http://www.stellent.com/GetFile/">
<dDocName>V_123410</dDocName>
<revisionSelectionMethod>latestReleased</revisionSelectionMethod>
<rendition/>
<extraProps/>
</GetFileByName>The problem is: On UCM web service, an empty tag like <rendition/> is treated like a "empty string" value, instead of a null value, and then the response i get isn't the expected.
What I want do to is change this behavior, and when I put null values in requests, the obpm should not write those tags. Is that possible?
Should be like that:
<GetFileByName xmlns="http://www.stellent.com/GetFile/">
<dDocName>V_123410</dDocName>
<revisionSelectionMethod>latestReleased</revisionSelectionMethod>
</GetFileByName>Thanks!

Hi,
I have question regarding aggregates. It's possible to read data from BW aggregates? We have webi reports on a SAP BW multi cube and we would like to optimize retriving query.
>> Because you are using the BW Query as the source all the items that you have done so far in terms of aggregation, indexing, ... is all valid and there are no specific steps required to leverage it with Web Intelligence. Make sure the aggregates are "correct" meansing that they do reflect what you are asking for in the Web Intelligence query panel
How can we filter in webi query null (#) values. If we create condition that some variabe is diffrent from # we still get null (#) values in report.
>> You should be able to create a variable. in case you tried that already could you be more specific ?
thanks
Ingo

Empty strings and nillable

I have the following:
<xs:element name="AString" nillable="true" type="xs:string" minOccurs="0" maxOccurs="1"/>
What I want is that when I call getAString() that this will return nulll if I
have not set the value.
At the moment it returns an empty string.
Thanks in advance,
Andrew

Hi Andrew,
can you provide a sample?
I tried what you said and I am getting null. Below is what I tried.
Lets say I have an xsd
<?xml version="1.0"?>
<xs:schema
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     xmlns:bea="http://www.bea.com/xmlbeans/Sample.xsd"
     targetNamespace="http://www.bea.com/xmlbeans/Sample.xsd"
     elementFormDefault="qualified"
     attributeFormDefault="unqualified">
<xs:element name="Person">
<xs:complexType>
<xs:sequence>
<xs:element name="FirstName" type="xs:string" />
<xs:element name="LastName" nillable="true" type="xs:string" minOccurs="0"
maxOccurs="1" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
and below is the code:
PersonDocument personDoc = PersonDocument.Factory.newInstance();
Person person = personDoc.addNewPerson();
person.setFirstName("Mike");
System.out.println("person.getLastName()"+ person.getLastName());
It prints null
Output:
person.getLastName()null
This is on WLW8.1Sp2.
Thanks a lot,
Vimala Ranganathan
"Andrew" <[email protected]> wrote:
>
I have the following:
<xs:element name="AString" nillable="true" type="xs:string" minOccurs="0"
maxOccurs="1"/>
What I want is that when I call getAString() that this will return nulll
if I
have not set the value.
At the moment it returns an empty string.
Thanks in advance,
Andrew

Report is showing "null" string for null values.

hi ,
I am new to BI Publisher and creating a report in BI Publisher. In the result set for null values, report is printing as "null". I checked the query , it gives blank (empty value) data for null values. But in report it is coming as "null" value (string "null"). I require to show the report as blank data for null values. Can you please help me to find solution for this ?.
Thank you very much in advance.
Regards
Gayathri.

it shouldnt happen like that
try these
<?xdoxslt:ifelse(ADDRESS3!='',ADDRESS3,'')?>
or
<?xdoxslt:ifelse(ADDRESS3!='null',ADDRESS3,'')?>
if those didnt work send me your template and xml to my email i can try that at my side .
Email [email protected]

Null value of fax and Null value of email is not reflecting in SRM

Hi
If you change the Vendor fax and email to null value in SAP(transaction XK02 in communication for address) and replicate the vendor in SRM 5.0 with transaction BBPUPDVD, still in manage business partners BBPMAININT as vendor I am able to see old fax number and email id instead of null value in Contact for Business Partner area.
Where as if we change vendor fax and email to new fax and email , after replication we wre able to see new fax and email id in manage business partners transaction as vendor.
Regards
Dayal

solved!

MS Access and Null values

Hi,
I'm attempting to create a report in Crystal Reports Designer 2008 using a Microsoft Access 2003 table as a source. I'm having difficulty with my report design when the first record of the table contains a NULL value. I wish to find the Maximum() value of this field using the formula Maximum({table.field1}, {table.field2}) where field1 contains the value i'm trying to find the maximum of and field2 contains the grouping data. I find that if field1 contains valid values then the formula works as expected whereas if the first field1 value is NULL then the formula simply refuses to output anything (not even an error).
I attempted to amend my formula to read:
If IsNull({table.field1})
Or {table.field1} = ""
Or {table.field1} = " " Then
"1"
Else
Maximum({table.field1}, {table.field2})
But this also refuses to work.
I also tried the following from the menu File > Report Options ... > Convert Database NULL Values to Default, and the other setting of Convert Other NULL Values to Default, but neither seemed to work for me.
Any ideas on how I can test the table to see if the value is a null and hence deal with it?
Thanks,
Mike

Ian,
I had previously tried that with no luck.
I've investigated further and I think the problem actually lies elsewhere. In my report design I join a couple of SQL Server views to the MS Access table. I think the join conditions are such that there is no data to bring back and so although the {table.field1} contains a vaule it is being ignored since the other tables can't join to it.
I've managed to alter my other views and the problem still seems to have gone for the moment.
I guess to answer my own question, the use of ISNULL(), = "" or = " " are the correct tests for a MS Access table and probably for most other data sources as well.
Thanks,
Mike

Problem with QofQ and Null Values

Just converted from CF5 to CF7. Finally figured out what was
causing the error message :
"The value "" cannot be converted to a number" when running a
QofQ. It happens whenever there is a NULL (and I think a ZERO)
value in the QofQ. I'm using the QofQ in a seperate chart program.
The main query merges data from a store and a region table.
I'm doing a LEFT OUTER JOIN to combine the REGION with the STORE,
AND so that stores with NO SALES for a given day will show up as
ZERO. On the main report, when I don't use a QofQWhen grouping by
DAY or MONTH, I can test the value in the CFOUTPUT for NULL or ZERO
and display "0" or "N/A" on the report.
But when I try to chart it, using a QofQ to read in the
values from the main query, and format the numbers, I get this
error message. I've tried using the CAST function, using FLOAT,
DOUBLE, BIGINT, etc., but still get same error message.
The only way I could fix this is to add a WHERE statement to
the QofQ, that only includes sales values greater than ZERO. But
then, I have gaps in my chart because stores with NO SALES for a
given day or MONTH don't appear. Because they are removed from the
query. The whole point of LEFT JOINS is to include items with no
values (or NULL) values.
Does anyone know if it's possible to keep these values in a
QofQ? So that items (e.g., store locations in my case) with NULL or
ZERO values for some or all days or months can be charted? Even
with a ZERO value? I've read everything I can get my hands on
regarding QofQ, the CAST function, etc., but nothing seems to work.
Thanks for any help. (FYI, didn't have this problem with CF5. It's
QofQ could handle NULL or ZERO values without providing an error).
Gary

Well, I tried the IsNull function on the 3 SUM() values I was
calculating in my SELECT statement (on a LEFT OUTER JOIN QUERY),
and I STILL got another "cannot convert "" to a number" but this
time the error message was more direct, and pointed me to a DATE
field in my query, where I was SORTING AND GROUPING either by DAY
or MONTH (depending on what user selected on form).
In my QofQ, I'm not just reformating the integer SUM()
values, but also the date values. So, I applied the IsNull()
function to the DATE values in my main query. I still kept getting
errors. But after experimenting ((SQL Server BOL docs doesn't give
ISNULL() examples for DATE FIELDS, only NUMBER fields), I tried
putting the dates in SINGLE QUOTES in my IsNull() function, the
QUERY RAN. Then I wasn't sure WHAT date to enter, e.g., 1/1/1889 or
1/1/2001, etc.
Then, I discovered, after experimenting, that you cannot just
blindly enter ANY date when using IsNull in a date field,
especially if you are using CFGRAPH to chart the results by day.
You have to select a date within the date range the user selected,
so this means using the FORM.DATE (or URL.DATE) value from the
form. Here's the working example from my SELECT main query:
SELECT SUM(ISNULL(d.ttldb,0)) AS SumOfDB,
SUM(ISNULL(d.ttldbv,0)) AS SumOfDBV,
SUM(ISNULL(d.ttldbi,0)) AS SumOfDBI,
<CFIF '#url.reptype#' IS "DAILY">
ISNULL(d.depday, '#url.date1#') AS depday
<CFELSE>
month(ISNULL(d.depday, '#url.date2#')) AS TranMonth,
year(ISNULL(d.depday, '#url.date2#')) AS TranYear
</CFIF>
Then I discovered that whatever date was used in the URL.DATE
field (in my case it would be one of the two date field from the
form, and depended on whether you coded DATE1 or DATE2, the chart
would always show ZERO values for that date. So I tried putting the
IsNull() date values in the GROUP BY and ORDER BY statements, e.g.,
<CFIF '#url.reptype#' IS "DAILY">
GROUP BY ISNULL(d.depday, '#url.date1#')
ORDER BY ISNULL(d.depday, '#url.date1#') DESC
<CFELSE>
GROUP BY year(ISNULL(d.depday, '#url.date2#')),
month(ISNULL(d.depday, '#url.date2#'))
ORDER BY year(ISNULL(d.depday, '#url.date2#')),
month(ISNULL(d.depday, '#url.date2#'))
</CFIF>
And this worked. The report ran just fine, and the chart
charted every value correctly.
I guess you have to learn all the little "quirks" about CF7
and how it's QofQ and chart programs work. But so far, so good.
Thank you all for your help. Now I've got to update other old
CF5 programs that are returning errors when there are null values
from my LEFT OUTER JOIN queries. Will take some time, but at least
I know how to do it. Thanks to your help.
I really appreciate your time and efforts to help with this
issue.
Gary

Automated row fetches, checkboxes and null values

Hi
In Apex3 I have a page with automated fetch row process that is working fine. Now I need to add a new not null varchar2 column "flag" which can be a Y or a N.
To do so, I created a new checkbox item p1_flag, set the source properties and the LOV definition to: STATIC2:Flag set;Y
However when I try to save the data with the checkbox unticked I get a null value error. To solve it, I created a computation on that field like this:
nvl(:p1_flag, 'N')
Is this the best way to do it? (other than using database triggers)
Thanks
Luis

Hi Patrick
Thanks for the reply. I thought that, just wondered if there were a better way...
Another option that I was thinking about was to modify the column definition to be nullable, with valid values being Y and null. So I wouldn't have to care about it. The only thing being that I don't like very much the idea of modifying the database design because of the development tool (though I saw things much worse than this, as using VARCHAR2 instead of DATE because the front end tool didn't handle date datatypes very well!)
Or just stick to a trigger to do it.
Cheers
Luis

Empty string and NULL value

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