by: Agoston Bejo |
last post by:
I want to enforce such a constraint on a column that would ensure that the
values be all unique, but this wouldn't apply to NULL values. (I.e. there
may be more than one NULL value in the column.)...
|
by: Bodza Bodza |
last post by:
I'm having an argument with an incumbent self-taught programmer that
it is OK to use null foreign keys in database design.
My take is the whole point of a foreign key is that it's not supposed...
|
by: Clifford Heath |
last post by:
I have a case where a table has two candidate primary keys,
but either (but not both) may be NULL. I don't want to store
a copy of the concatenated ISNULL'ed fields as an additional
column, though...
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by: Shridhar Daithankar |
last post by:
Hello All,
I was just updating a table in oracle9.2 by hand and bumped into this.
Following seems to be the valid syntax in oracle.
Update foo set somefield=NULL where somefield >9;
Now I...
|
by: Rajesh Kumar Mallah |
last post by:
Hi,
Looks like alter table does not tells about the indexes it dropped
PG version: 7.4.3
Regds
mallah.
|
by: Bob Stearns |
last post by:
I have successfully designed a trigger to make sure a set of fields are
unique if not null. However it fails in one case: when the duplication
occurs among a set of rows being updated...
|
by: axelsino |
last post by:
I know this has been asked before and yes, I have read the section in
the documentation about it.
But, my question is: If I have setup mysql with strict_trans_tables,
will MySQL allow "null"...
|
by: Rahul B |
last post by:
Hi,
I dropped a not null column from a table.
After that i reorganized the table.
However, an update statement is giving error like
"(Reason "column number out of range".) SQLSTATE=58004"
...
|
by: tonialbrown |
last post by:
I am having some problems with an update statement. The problem is the data comes from a list box lstDelFrom that the user selects for the required record that they are copying the data from. This...
|
by: taylorcarr |
last post by:
A Canon printer is a smart device known for being advanced, efficient, and reliable. It is designed for home, office, and hybrid workspace use and can also be used for a variety of purposes. However,...
|
by: ryjfgjl |
last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
|
by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
|
by: BarryA |
last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
|
by: nemocccc |
last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
|
by: Sonnysonu |
last post by:
This is the data of csv file
1 2 3
1 2 3
1 2 3
1 2 3
2 3
2 3
3
the lengths should be different i have to store the data by column-wise with in the specific length.
suppose the i have to...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However,...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers,...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
|
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