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0
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1answer
51 views

SQL Server - Is it possible to forbid creation of default constraint name?

I was having a looking on this article about default constraints and I have a question. Is there a configuration in SQL Server 2008 that forbid naming creation of new default constraints declared ...
3
votes
1answer
216 views

Why is add timestamp column with default not null so slow in Oracle 11g?

In Oracle I need to add a new column with type timestamp with time zone to a large table (80 million rows). I cannot have more than 30 - 60 seconds of downtime when I run it in production. This ...
2
votes
1answer
70 views

Confused on how a value gets added with the DEFAULT constraint

A recent definition I've read about Default Constraints: DEFAULT is specified for a column to assign a column a specific value if no value is specified when a row is added. I believe I've seen code ...
0
votes
0answers
38 views

Is there any way to set server-wide and schema-wide default row formats for InnoDB tables in MySQL?

Is there a way to set server-wide and database-wide default row formats? Currently it seems that I must specify ROW_FORMAT in CREATE TABLE or ALTER TABLE statements. Am I reading the documentation ...
0
votes
1answer
86 views

Why is column default value not portable through different RDBMS?

Some ORMs (doctrine) do not support default values in database schema definition, because they states it is not portable. But SQL92 supports the DEFAULT value clause, and all the databases supported ...
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votes
5answers
12k views

How can I use a default value in a Select query in PostgreSQL?

I would like to use a default value for a column that should be used if no rows is returned. Is that possible in PostgreSQL? How can I do it? Or is there any other way I can solve this? E.g. ...
3
votes
2answers
3k views

How to create column in DB with default value random string

Can I create column in DB table (PostgreSQL) which have default value random string, and how ? If is not possible, please let me know that.
2
votes
2answers
1k views

SQL set allowed values for a column

I want to make an ALTER TABLE expression which adds a new column and sets a default value and additionaly defines the allowed values for that column. It's a text column, and allowed should be only ...
6
votes
1answer
3k views

Add DEFAULT to existing column

In Microsoft SQL server, how can I add/change the default on an existing table column using T-SQL?
9
votes
2answers
1k views

Why can't I use NEWSEQUENTIALID() as the default value for my column?

I'm trying to create a table in Management Studio and after reading about the new (from SQL 2005 on) NEWSEQUENTIALID() function, thought I'd give it a go. This is what I'm doing: But it's not ...
2
votes
1answer
1k views

alter table (mysql) adding column with default value of space (' ')

On my Mac, using 5.5.11 MySQL Community Server (GPL) alter table foobaz add column ( extendedTitle varchar(3000) DEFAULT NULL, clasindxIndent int, spacedash1 enum (' ', '-', '1') default ' ', ...
5
votes
1answer
122 views

Find out which columns must be specified in insert-statement

Sometimes when inserting data in a table with many columns it could be useful to know which columns must be specified if the insert-statement shouldn't fail. I wrote this query to find out which ...
3
votes
1answer
322 views

How can I get MySQL to use the value returned by a function as a default?

I have a pre-existing table that has a column to that can hold a UUID. I'd like to be able to define a default such that new rows coming in (from legacy systems) will still get a UUID defined, via ...
4
votes
1answer
471 views

An alternative for sp_unbinddefault

I have a column with default value bound to UW_ZeroDefault and I am trying get rid of it. As I understand it, this default has been created by using CREATE DEFAULT then the column has been bound to ...
1
vote
2answers
2k views

How to set addtime(current_timestamp, '15:00:00') as MySQL timestamp column default value?

I want to set `addtime(current_timestamp, '15:00:00') as the default value of one MySQL table column. I tried to do this with the following command but failed: mysql> alter table mytable change c1 ...