Does Oracle allows zero length string

Hi,
I tried to insert zero length string ('') into an Oracle table, a null value and a non-empty string. But I found that zero length string and null are stored as NULL in the column.
Create table test (col1 number(2), col2 varchar(10));
Insert into test values (1, 'hi');
Insert into test values (2, NULL);
Insert into test values (3, '');
Select * from test where col2 is null;
Result: 2 rows
Select * from test where col2 = '';
Result: 0 rows
Is this to do with some environment setting in SQL* Plus or does oracle doesn't allow zero length string?

Oracle treats '' as NULL.
There are frequent murmurs that some new version of Oracle is going to change this behaviour (I believe it's not ANSI-compliant) but I doubt that they will, as it will break too many old applications.
Cheers, APC

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Hai all
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Hi
For example when i try to insert 02323 in one of the database item , after inserting i note the database.
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The old server works fine. This problem occurs on our new server only. We want to run the same app on the new server. Of course not at the same time. So we shut down the old server before starting the new one. But we still get just one good read from the serial devices. We do not get any error message. Would it be possible to get a phone number so that we could call the NI and describe our environment and the issue we came across in more detail. Thanks.

1 (800) 433-3488
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Ben Rayner
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If you want to grasp an understanding about zero length strings then you should make yourself a coffee (or you may need several cups) and take a read of this thread:
Treatment of zero-length strings as NULLs?
But in short you should note that using a string '' is not a zero length string, but is considered to be NULL. Therefore your original clob, when using this is NULL.
Consider the following instead...
SQL> declare
2 myClob clob;
3 begin
4 -- :myClob := to_clob('');
5 for rec in (select ename from emp)
6 loop
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Length
98
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SQL>

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Hi,
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>
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Does Oracle allows zero length string

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