I need to design a table in SQL Server having some columns, one of these columns (ID column and use sequential uniqueidentifier) should automatically populate its data when inserting other column data.
The values of the ID column should be generated automatically when insertion happens.
Please help me to do this, any help is appreciated.
NB: I am new to this step by step approach will be more helpful
Just create a table with a column ID of datatype uniqueidentifier and set it's default value to newsequentialid():
Then, when you go insert rows into that table, just omit the ID column from the list of columns you're inserted values into:
INSERT INTO dbo.YourTable(ColA, ColB, ....., ColX)
VALUES(.., .. ,. ...)
If you don't explicitly insert a value into ID, the default specification (newsequentialid()) will be used .
As per Marc_s's comment, you should use NEWSEQUENTIALID()
CREATE TABLE myTable (ColumnA uniqueidentifier DEFAULT NEWSEQUENTIALID());
See NEWSEQUENTIALID (Transact-SQL)
How do include a function like getdate() in an insert statement for Hibernate query?
Lets say one of the properties of a mapped class is a datetime column how do put specify getdate() in order for the .save() method call to use the server timestamp?
Simple answer is don't include it in the insert statement and let SQL do it.
In the SQL table designer where you have the date column you are inserting into, set the Default Value to GETDATE() in the column properties and SQL Server will handle it for you.
Reference and sample: SQL Server GETDATE() Function
Table create script will look like this:
CREATE TABLE Orders
(
OrderId int NOT NULL PRIMARY KEY,
ProductName varchar(50) NOT NULL,
OrderDate datetime NOT NULL DEFAULT GETDATE()
)
I've got a table that collects forms submitted from our website, but for some reason, when they created the table, they didn't put a timestamp in the table. I want it to enter the exact date and time that the record was entered.
I know it's in there somewhere, but I can't seem to find how to set the default value (like in Access, you use getNow() or Now()) but I don't know where to put it.
For modifying an existing column in an existing table:
ALTER TABLE YourTable ADD CONSTRAINT DF_YourTable DEFAULT GETDATE() FOR YourColumn
This can also be done through the SSMS GUI.
Put your table in design view (Right click on table in object explorer->Design)
Add a column to the table (or click on the column you want to update if it already exists)
In Column Properties, enter (getdate()) in Default Value or
Binding field as pictured below
In that table in SQL Server, specify the default value of that column to be CURRENT_TIMESTAMP.
The datatype of that column may be datetime or datetime2.
e.g.
Create Table Student
(
Name varchar(50),
DateOfAddmission datetime default CURRENT_TIMESTAMP
);
While the marked answer is correct with:
ALTER TABLE YourTable ADD CONSTRAINT DF_YourTable DEFAULT GETDATE() FOR YourColumn
You should always be aware of timezones when adding default datetime values in to a column.
Say for example, this datetime value is designed to indicate when a member joined a website and you want it to be displayed back to the user, GETDATE() will give you the server time so could show discrepancies if the user is in a different locale to the server.
If you expect to deal with international users, it is better in some cases to use GETUTCDATE(), which:
Returns the current database system timestamp as a datetime value. The database time zone offset is not included. This value represents the current UTC time (Coordinated Universal Time). This value is derived from the operating system of the computer on which the instance of SQL Server is running.
ALTER TABLE YourTable ADD CONSTRAINT DF_YourTable DEFAULT GETUTCDATE() FOR YourColumn
When retrieving the values, the front end application/website should transform this value from UTC time to the locale/culture of the user requesting it.
Disallow Nulls on the column and set a default on the column of getdate()
/*Deal with any existing NULLs*/
UPDATE YourTable SET created_date=GETDATE() /*Or some sentinel value
'19000101' maybe?*/
WHERE created_date IS NULL
/*Disallow NULLs*/
ALTER TABLE YourTable ALTER COLUMN created_date DATE NOT NULL
/*Add default constraint*/
ALTER TABLE YourTable ADD CONSTRAINT
DF_YourTable_created_date DEFAULT GETDATE() FOR created_date
The syntax for this when creating a new table is:
CREATE TABLE MyTable
(
MYTableID INT IDENTITY(1,1),
CreateDate DATETIME NOT NULL CONSTRAINT DF_MyTable_CreateDate_GETDATE DEFAULT GETDATE()
)
This works for me...
ALTER TABLE [accounts]
ADD [user_registered] DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ;
This also works:
CREATE TABLE Example(
...
created datetime default GETDATE()
);
Or:
ALTER TABLE EXAMPLE ADD created datetime default GETDATE();
This worked for me. I am using SQL Developer with Oracle DB:
ALTER TABLE YOUR_TABLE
ADD Date_Created TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL;
Let's say you create a database table for a registration system.
IF OBJECT_ID('dbo.registration_demo', 'U') IS NOT NULL
DROP TABLE dbo.registration_demo;
CREATE TABLE dbo.registration_demo (
id INT IDENTITY PRIMARY KEY,
name NVARCHAR(8)
);
Now a couple people register.
INSERT INTO dbo.registration_demo (name) VALUES
('John'),('Jane'),('Jeff');
Then you realize you need a timestamp for when they registered.
If this app is limited to a geographically localized region, then you can use the local server time with GETDATE(). Otherwise you should heed Tanner's consideration for the global audience with GETUTCDATE() for the default value.
Add the column with a default value in one statement like this answer.
ALTER TABLE dbo.registration_demo
ADD time_registered DATETIME DEFAULT GETUTCDATE();
Let's get another registrant and see what the data looks like.
INSERT INTO dbo.registration_demo (name) VALUES
('Julia');
SELECT * FROM dbo.registration_demo;
id name time_registered
1 John NULL
2 Jane NULL
3 Jeff NULL
4 Julia 2016-06-21 14:32:57.767
To make it simpler to follow, I will summarize the above answers:
Let`s say the table is called Customer
it has 4 columns/less or more...
you want to add a new column to the table where every time when there is insert... then that column keeps a record of the time the event happened.
Solution:
add a new column, let`s say timepurchase is the new column, to the table with data type datetime.
Then run the following alter:
ALTER TABLE Customer ADD CONSTRAINT DF_Customer DEFAULT GETDATE() FOR timePurchase
In SQLPlus while creating a table it is be like as
SQL> create table Test
( Test_ID number not null,
Test_Date date default sysdate not null );
SQL> insert into Test(id) values (1);
Test_ID Test_Date
1 08-MAR-19
I have a table [Product] with a column [CreateTime] datetime null, and is has some data already.
How can I set the column [CreateTime] 's default value to getdate(), and make the new added data to have a default value getdate() for column [CreateTime].
You cannot change a default - you will need to first drop it, and then recreate it.
In order to drop it, you need to know its name, and then use
ALTER TABLE dbo.Product
DROP CONSTRAINT yourOldDefaultConstraint
Once you've done that, you can add a new default constraint, and in order to apply it to existing rows, use the "WITH VALUES" part:
ALTER TABLE dbo.Product
ADD CONSTRAINT NewDefaultConstraintName
DEFAULT GetDate() FOR CreateTime WITH VALUES
Oops - sorry, the "WITH VALUES" only seems to work if you create a DEFAULT constraint at the time you create the table, or if you add the column - it doesn't seem to get applied to an existing column.
In this case you would just have to follow your ALTER TABLE statement with something like this:
UPDATE dbo.T_Product
SET CreateTime = GETDATE()
WHERE CreateTime IS NULL
That should do the trick, too!
Marc
The information should be 2 date time columns(inserted/updated) with ms precision and should be automatically updated by the server whenever someone inserts, or updates a row.
Add columns to your table
ALTER TABLE yourTable ADD
Inserted datetime NULL,
Updated datetime NULL
GO
Create an Update and Insert Trigger to update the columns
CREATE TRIGGER yourTableInsertTrigger
ON yourTable
AFTER INSERT
AS
BEGIN
Update yourTable Set Inserted = getdate()
from Inserted
Where yourTable.Key = Inserted.Key
END
GO
CREATE TRIGGER yourTableUpdateTrigger
ON yourTable
AFTER UPDATE AS
BEGIN
Update yourTable Set Updated = getdate()
from Updated
Where yourTable.Key = Updated.Key
END
GO
Now if you want to be really clean, you'd make sure that these two columns couldn't be changed/updated by using views instead of direct table access for your other access to the data. Also if your primary keys aren't consistent, and you have many tables I'd suggest you use CodeGeneration to create the sql. MyGeneration would do nicely.
I think the inserted trigger is obsolete. Just add getdate() to the inserted column as a default value instead of null.