NVL function varies from char to varchar2 data type

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0  Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

SQL> create table fullJoinTest1(col1 char(14));

Table created.

SQL> create table fullJoinTest2(col1 char(14));

Table created.

SQL> insert all
  2  into fullJoinTest1 values('aaa')
  3  into fullJoinTest1 values('bbb')
  4  into fullJoinTest2 values('aaa')
  5  into fullJoinTest2 values('ccc')
  6  select 1 from dual;

4 rows created.

SQL> select nvl(a.col1,b.col1) as aaaa
  2    from fullJoinTest1 a full join fullJoinTest2 b
  3      on a.col1=b.col1
  4   where nvl(a.col1,b.col1)= 'ccc';

no rows selected

SQL> create table fullJoinTest3 as
  2  select nvl(a.col1,b.col1) as "WhatIsType?"
  3    from fullJoinTest1 a full join fullJoinTest2 b
  4      on a.col1=b.col1
  5   where nvl(a.col1,b.col1)= 'ccc';

Table created.

SQL> desc fullJoinTest3
 Name          Null?    Type
 ------------- -------- ------------
 WhatIsType?            VARCHAR2(14)

SQL> create table fullJoinTest4 as
  2  select case when a.col1 is not null then a.col1 else b.col1 end as "WhatIsType?"
  3    from fullJoinTest1 a full join fullJoinTest2 b
  4      on a.col1=b.col1;

Table created.

SQL> desc fullJoinTest4
 Name        Null?    Type
 ----------- -------- --------
 WhatIsType?          CHAR(14)

My question is why nvl function varies from char to varchar2 data type?
Same case expression does not change the data type.
I insist that this is a bug of function nvl isn't - it.

Documented behavior:
http://download.Oracle.com/docs/CD/E11882_01/server.112/e17118/functions119.htm#SQLRF00684

If expr1 is character data, then Oracle Database converts expr2 to the data type of expr1
before comparing them and returns VARCHAR2 in the character set of expr1.

Tags: Database

Similar Questions

VARCHAR2 data type do not convert date
Dear gurus

Version of database - 10.2.0

I have a problem of varchar2 data type do not convert date...

I have a table like

SQL > table desc.
Name Null? Type
----------------------------------------- -------- ----------------------------
NAME VARCHAR2 (10)
RECORD_DATE VARCHAR2 (20)

and the record consists are...

SQL > select * from table;

NAME RECORD_DATE
---------- --------------------
Nimai 09/09/2012 09:10
Nimai 09/09/2012 10:10
Scott 09/09/2012 11:10
Scott 09/10/2012 10:00
Nimai 09/10/2012 11:00

If the "Record_date" column that's 09/09/2012(dd/mm/yyyy)

09/09/2012 and I want to query the records which includes the date ' select * from table where record_date = 09/09/2012 "...
This work of query...

Select * from table where
TO_CHAR (to_date (substr(record_date,1,10), ' dd/mm/yyyy'), ' dd/mm/yyyy')
=
TO_CHAR (to_date (substr('09/09/2012',1,10), ' dd/mm/yyyy'), ' dd/mm/yyyy')
;

But if the "record_date" column that's 9/9/2012(d/m/yyyy) I did not what to do which function to use? /

Help, please!

Thanks in advance
Nimai kinzonzi

Published by: 955748 on September 22, 2012 03:47

Published by: 955748 on September 22, 2012 04:10
Hello;

Keep things simple: (get rid of TO_CHAR)

SELECT TO_DATE ((substr (record_date, 1, 10), ' DD/MM/YYYY') of?)

TO_DATE (substr (record_date, 1, 12), "HH24 MON-DD-YY")

Best regards

mseberg

convert the varchar2 data type to the data number type
How to convert the varchar2 data type to the data type number.

It looks like my data

create table one)
col1 varchar2 (50)
col2 varchar2 (500);

Insert in a (col1, col2) values ('1234 ', ' 2345');

Select Column1 of number (19)) cast (to_number (col1);

IAM getting error invalid number

I need to create a table with the same columns with data like number types (19)

can someone help me

Thank you
You have changed your original post, so now I see that you get the invalid number.

This is why you should always avoid the varchar columns to store numbers or dates...

Since your table source contains a nonnumeric value, you can write a pl/sql to convert data and see what records are false:
```
SQL> insert into a (col1,col2) values ('xxxx','2345');

1 row created.

SQL> select * from a;

COL1     COL2
-------- --------
1234     2345
xxxx     2345

2 rows selected.

SQL> create table b (col1 number(19), col2 number(19));

Table created.

SQL> set serverout on

SQL> declare
  2  cursor c is
  3  select * from a;
  4  begin
  5    for r in c loop
  6     begin
  7       insert into b values (to_number(r.col1), to_number(r.col2));
  8     exception
  9       when invalid_number then
 10        dbms_output.put_line('Row rejected: col1='||r.col1||' col2='||r.col2);
 11     end;
 12    end loop;
 13  end;
 14  /
Row rejected: col1=xxxx col2=2345

PL/SQL procedure successfully completed.

SQL> select * from b;

      COL1       COL2
---------- ----------
      1234       2345

1 row selected.
```
Max

Published by: Massimo Ruocchio, June 14, 2011 20:00
Added the first query in the example

Convert a varchar2 data type Date
Hi guys,.

Can someone help me convert a Varchar2 data type in the data type Date?

I have a query and my column is a varchar2 data type.
I want to just that convert the Varchar2 in a DATE, because I met
problem in my query. I want to do the day1 day10 transaction.

Ex:
Day 1 = January 1, 2010
Day10 = January 10, 2010

table.record_date varchar2 (12)

SELECT column1, Column2
table
where record_date between? and?

How can I set the record_date between day1 and day10 since record_date is of type varchar?

Thank you.

Laetitia
Lala,

If the data in the database are in the format MM-DD-RR , then you must use the same format when you convert back to this day.

So change the query to
```
SELECT COLUMN1, COLUMN2 FROM TABLE WHERE TO_DATE(RECORD_DATE, 'MM-DD-RR') BETWEEN TO_DATE('01-JAN-2010') AND TO_DATE('10-JAN-2010')
```
Kind regards

Manu.

How can I justify the difference between varchar and varchar2 data type
Hi all

How can I justify the difference between the data type varchar and varchar2 on any table for space management.
Is there any query to justify this.

Concerning
Girish

Published by: boujemaa on February 2, 2011 21:23
http://download.Oracle.com/docs/CD/B19306_01/server.102/b14220/datatype.htm#sthref3780

The VARCHAR data type

The VARCHAR data type is synonymous with the VARCHAR2 data type. To avoid any changes in behavior, always use the VARCHAR2 data type to store strings of variable length.

Excerpt from time in the data type Date
Hi guys,.

I run the query below:
```
 
select to_char(sysdate,'hh24:mi:ss') from dual 
14:39:04

select to_date(to_char(sysdate,'hh24:mi:ss'),'hh24:mi:ss') from dual
01/07/2012 14:39:40
```
Is is possible to get just the part time in IE the date in any case data type, using the second request, I should get only the part time instead of any date and time.

See you soon,.
Shaz
Hi, Shaz,

SH * wrote:
Is is possible to get just the part time in IE the date in any case data type, using the second request, I should get only the part time instead of any date and time.

Lol DATEs in Oracle always include year, month, day, hours, minutes, and seconds. There is no way to get a DATE without each of them.

You may want to store this data in an INTERVAL column, not a DATE.
Depending on how you plan to use, a NUMBER might work, too (for example, the number of minutes after midnight) or a VARCHAR2, such as ' 09: 53:32'.
If you really need to use a DATE for any reason, you may simply ignore the year, month and day or put always a default value, such as 1 January 0001.

What is the problem you're trying to solve? If you explain what you need to do, then someone can help you find a good way to do it.

Table of functions and direct requests for NUMBER data types database
Hello. I call a number of functions table of our Enterprise BI server, and I chose to do this by using direct database requests (I believe you can also call functions table in the physical layer of the repository, but is not what I do). The problem is that whenever I go back any number of the table function which is not a whole number (1.23, for example), BI assigns the INTEGER data type to the field rather than the data type DOUBLE, rounded so my number to the nearest integer. Here is a short example:

Create these 3 database objects:

CREATE or REPLACE TYPE my_row AS OBJECT (my_num NUMBER);

CREATE or REPLACE TYPE my_tab AS TABLE OF THE my_row;

FUNCTION to CREATE or REPLACE my_table_function RETURN my_tab
PIPELINED IS
BEGIN
PIPE ROW (my_row (1.23));
END;
/

Make this your request at your request Direct to database:

SELECT my_num FROM table (my_table_function);

This query returns correctly '1.23' when it is called from the database. In BI, on the other hand, it returns a value of '1' (and the field of labels an INTEGER rather than data type DOUBLE). If at the request of data Direct you change column properties-> data-> decimal from 0 to 2 Format, then it displays is not surprising "1.00". I then tried to change MY_ROW. Data type of MY_NUM by explicitly specifying the precision and no luck. BI still labels this field as an INTEGER. Then I started to try to deceive BI massaging the SQL statement itself. None of the following worked:

SELECT to_number (my_num) as my_num2 FROM table (my_table_function);
SELECT my_num2 + 0.01 as my_num3 FROM (SELECT my_num - 0.01 AS my_num2 FROM table (my_table_function));
SELECT to_number (to_char (my_num)) as my_num2 FROM table (my_table_function);
SELECT to_number (substr (to_char ('x' | my_num), 2)) as my_num2 FROM table (my_table_function);

Now, I found a solution, but I'm surprised that I have to resort to that:

SELECT * FROM (SELECT / * + NO_MERGE * / table my_num (my_table_function));

Is anyone out there knows a better way to do it? The above is a hack in my opinion. :)

Thanks in advance for any input.

-Jim
Yes, it's really amazing.
But I got it.
```
CREATE OR REPLACE TYPE my_row AS OBJECT (my_num NUMBER(10,2));
```
and in your SQL:
```
SELECT cast(my_num as double precision) as my_num2 FROM table(my_table_function);
```
I have the good result and I see the numbers after the decimal point.
Very delicate!

Published by: gerardnico on July 7, 2009 14:55 change number (10.2) in double precision... pffff

Change the number in Varchar2 Data Type
Hello

We have a running production applications. There is a column called home_number which is a type of data number, now called the new requirement to change of varchar2.

I tried to edit the table get the below error.

-Edit the "TECH_SOURCING_EMPLOYEE_DETAILS" table change
-("HOME_PH_NUMBER" VARCHAR2 (1000))
-- /

-ORA-01439: column to change must be empty to change data type

Please suggest me how to change the data type of column without affecting the data.

Thank you
Sudhir
Try below, I tested in my database.
```
create table tmp
(ID NUMBER,
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insert into tmp values(1, 9122222);

alter table tmp add MY_HOME_NUMBER VARCHAR2(1000);

update tmp
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update tmp
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alter table tmp drop column home_number;   

alter table tmp rename column my_home_number to home_number; 
```

Employee_number hr.per_all_people_f varchar2 data type
Hello Oracle gurus, could someone tell me why the number of employee in the table Per_All_People_F column is varchar2 instead of the data type data type Number.

Thanks in advance, Naveen Gagadam
Hi Naveen

The employee number may be whatever it is based on the requirement, for example, you can have employee number which begins with the a. The data type of this field is Varchar2 instead of the number so you can customize employee number using the quick forumla.

HTH
Gerard

Bad high and low value with the varchar2 data type
Hello

It is an application on e - biz on database 9205, with inventory module.

In one of the mtl_txn_request_headers of the table, the data for the number of application type is varchar2 (30). When I checked the low_value & high_value in dab_tab_columns, I see that the low_value is 100001 (6 digits) and high_value is 99999 (5 digits).

I used the utl_raw.cast_to_varchar2 (low_value) to convert the value.

In our case, we save a large part of the value in incremental number and some of our query will be in the predicate of the range (between).

How should I handle this kind of situation and which option do I?

Appreciate any help. Thank you.
Accepted this looks like a classic bad-data type problem, but as this picture seems be part of Oracle E-Business Suite the OP should probably talk first Oracle.

function to change the names of data type members

I was wondering if (TestStand 4.2) contains the ability to call all referrences to a Data Type member used in a sequence will be replaced by the new name if this member DataType is renamed in the MyTypes.ini file?

The answer is no, and it's a difficult problem, if you speak code modules written in different programming languages different sources including files and always a problem semi-difficile if you're not because of the possibility of lookupstrings appearing in places unusual or used in an unusual way.

However, there are 2 features that exist in TestStand 4.2 which should help with this.

(1) search/replace in files - if the old name is quite unique, it should be easy, if it is not then maybe with a clever use of regular expressions in the search string, it should still be feasible.

(Monitor 2) - this should help you find the places that need fixing or you might have missed to make 1) above.

Hope this helps,

-Doug

Long and varchar2 data type
Afternoon people,
My apologies if I use the wrong forum, but I can't seem to find a place related to SQL and PL/SQL. In the affirmative, please let me know.

Here's my problem on site:
I have a very long sql who fault kept in my program with an ORA error 6502. After a while I thought about it and I was trying to assign a length of 48000 string to a variable declared in my PL/SQL which is varchar2 (32767). Then, of course the program is a failure for known causes.

I know there a CLOB, but this isn't workign fine with dbms_sql.parse. Anyone know what is the precision for a long TIME? I found some information on lONG but my program doesn't work.

--> Long character variable length up to 2 gigabytes of data, is 2 to the power of 31-1 bytes. Provided for backward compatibility.

Number of bytes = 2147483647

So, how is it I'm being not able to entrust the 48000 string? Anyone know of a better solution? Any help is greatly appreciated!

Thank you
This is the wrong forum. There is a forum called SQL and PL/SQL where you'll get better answers.

The short answer is that long (which are obsolete) and LOBS require special treatment and behave differently from other types of data.

Data from table in XML data type

Hi friends,

I have data of type table, and I want that in XML to send through the web service.

could you please suggest any api available in Oracle 11 g (PLSQL) for this or any method to produce.

Help, please.

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For example, if MY_FUNCTION() returns a MAJOR_LINE_TABLE_TYPE collection type, you can do something like this:

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XmlElement ("ROOT"

xmlagg (xmltype (t.object_value))

)

dash

) as a result

table (my_function ()) t;

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How to make the sum of hours which is the varchar2 data type in oracle
Hi my table is like this
emp_ngtshthrs (empno number (10), nightshifthrs varchar2 (20));

now I want sum employee nightshifthrs how do the sum hours, it's my hours 01:00, 05:00, 08:00, 10:00, 07:00 and 09:00
I want the sum type varchar2 hours how to do? and I want to display the sum is greater than 24:00
Well, first of all you have posted your question in the wrong forum. You should have posted your question in the forum SQL and PL/SQL .

The second problem I see is that you are being too generic when you have your employees enter their night shift hours worked. If you are able, I recommend that you change your table to record hours separately from minutes and make columns of type NUMBER instead of the VARCHAR2() type. Then, you can simply use arithmatic to total the hours and minutes worked.

If you are locked in your table and cannot change it, you can convert characters to numbers and then perform your basic arithmatic on values. For example:
```
  1  with tab1 as (
  2  select 10 as empno, '01:00' as nightshifthrs from dual union all
  3  select 10 as empno, '05:00' as nightshifthrs from dual union all
  4  select 10 as empno, '08:00' as nightshifthrs from dual union all
  5  select 10 as empno, '10:00' as nightshifthrs from dual union all
  6  select 10 as empno, '07:00' as nightshifthrs from dual union all
  7  select 10 as empno, '09:00' as nightshifthrs from dual)
  8  select sum(to_number(replace(nightshifthrs,':','.'))) AS hours_worked
  9* from tab1
SQL> /

HOURS_WORKED
------------
          40
SQL> 
```
Of course, if your users can and do enter the minutes, then which complicates the example I provided. You will need to convert the decimal minute, sum the amount, then convert the decimal time and add this to your hours. For example:
```
  1  with tab1 as (
  2  select 10 as empno, '01:15' as nightshifthrs from dual union all
  3  select 10 as empno, '05:00' as nightshifthrs from dual union all
  4  select 10 as empno, '08:30' as nightshifthrs from dual union all
  5  select 10 as empno, '10:00' as nightshifthrs from dual union all
  6  select 10 as empno, '07:45' as nightshifthrs from dual union all
  7  select 10 as empno, '09:00' as nightshifthrs from dual)
  8  select sum(to_number(substr(nightshifthrs,1,2))) + SUM(to_number(SUBSTR(nightshifthrs,4,5)))/60
  9* from tab1
SQL> /

HOURS_WORKED
------------
        41.5
SQL> 
```
I hope this helps.

Craig...

How to compare a long data type with a varchar2 data type?

I need to select these views in my database that contains some passages.
To do this, I wrote this query
Select * from user_views
where lower (text) like '% "| Cast ('text to compare' as long). '%'
but this gives exception: ora-00932
Can you please help how to do that?
```
May be give this a try.

select object_name
     , view_text
  from (
          select object_name
               , dbms_metadata.get_ddl('VIEW', object_name, user) view_text
            from user_objects
           where object_type = 'VIEW'
       )
 where lower(view_text) like '%text to compare%';
```

NVL function varies from char to varchar2 data type

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