I want to insert an item to a table in the database. The table has a key that is auto generated. Is it possible to override the auto generated key, (force a value). If so how?
I'm going to assume you are talking about identity columns and not sequences.
In DB2's CREATE TABLE syntax, have a look at the "generated-column-spec" in the syntax diagram as it relates to identity columns. There are two ways to specify how the identity value will be generated:
GENERATED ALWAYS: this option will always generate and identity value, and you cannot specify a value for the identity column in an insert statement
GENERATED BY DEFAULT: this option will generate an identity value if no value for the column is specified in the insert statement. If you provide a value for the column in the insert statement, db2 will not generate an identity value for it.
If the table you are trying to insert into used the ALWAYS option when the table is created, then you cannot override it. You'll need to drop and recreate the table or use the ALTER TABLE statement to redefine the column to generate the identity value by default only.
If you're trying to LOAD data into a table that has an identity column which is GENERATED ALWAYS then you can do this:
db2 load from tab43.ixf of ixf modified by identityoverride into tablename
Related
is that possible to do a computed column without affecting existing data?
I have a unique index column named
"BookingNo"
For newly insert Column I want it to be following this format
(format([CreationTime],'yyMMddHHmmssff'))
I tried used Computed Column but it modified all my existing data.
my existing BookingNo format was
201800123
Is there anyway to generate via database? Or we have insert via code?
You could just add a default constraint:
ALTER TABLE TableName
ADD CONSTRAINT DF_BookingNo DEFAULT(format(SYSDATETIME(),'yyMMddHHmmssff'))
FOR BookingNo
This way you will get the value only for newly created rows.
Please note that if this column has a unique constraint on it some inserts might fail if they are executed at the same time.
I have set some script that inserts data from an XML file into a SQL database. I am getting the following error.
Cannot insert the value NULL into column 'fighterID', table 'MMA Database.dbo.FIGHTERStemp'; column does not allow nulls. INSERT fails.
I have fighterID set as the primary key and will not allow NULLS. My intention is to have it number each row as they are inserted. I found one answer that advises to modify the column properties to be the identifier. However it will not let me adjust the columns properties without dropping and adding the table again.
I can do that - but what is the SQL syntax to set the identity specification settings? Am I going about this the right way?
It's pretty simple, just set the field with datatype INT (integer) and follow it with keyword IDENTITY. You can include the seed and increment values; e.g. start at 1, increment by 1, or just use the keyword IDENTITY for a 1,1 default.
CREATE TABLE MMA (FighterID INT IDENTITY (1,1), FighterInfo VARCHAR(MAX))
While inserting data into Primary key you can check the previous max id value and then increment it to next value before you insert a new row.
In SQL, you need to drop table before altering its specification. You can do this by taking backup into temp table then drop your main table and then re insert data from temp table.
I have a table filled with data and one of the columns - TrackingNumber - is an integer value. I have gotten a request to change it to auto-increment and to have it start the identity seed at 1000000. I know that I cannot alter a column to be an identity column in an existing table with data, so I have two options: either create an entirely new table and then move data from the old table into that new table or add an new identity column and update it with data from the old column.
The problem is that I need to retain all the existing values in column TrackingNumber. I have tried the following:
1) ALTER TABLE [dbo].[Table1]
ADD [TrackingNumber2] [bigint] IDENTITY (1000000, 1) NOT NULL
2) UPDATE [dbo].[Table1]
SET [TrackingNumber2]=[TrackingNumber]
3) ALTER TABLE [dbo].[Table1]
DROP COLUMN [TrackingNumber]
GO
4) EXEC sp_rename 'Table1.TrackingNumber2', 'TrackingNumber','COLUMN'
I got an error on step 2 - Updating new column with the value from the old column: "Cannot update identity column 'TrackingNumber2'"
Can anyone recommend a workaround?
You just need to set identity_insert on for this table so you can update the values. Make sure you turn it back off when you complete the update. :)
https://msdn.microsoft.com/en-us/library/ms188059.aspx
Are you sure you need to use an identity column? There are alternatives. For example, since SQL Server 2012 (and azure, too), there are these things called sequences. You can define a sequence to start at any number you like:
create sequence dbo.TrackingSequence
as int
start with 1000000
increment by 1
no maxvalue
no cycle
no cache
Then, you can alter the table such that the default value for the column in question defaults from the sequence:
alter table dbo.MyTable
add constraint [MyTable.TrackingNumber.Default.TrackingSequence]
default( next value for dbo.TrackingSequence ) for TrackingNumber
(If the column already has a default value, you need to remove that first - in a separate statement.)
A sequence works a lot like an identity, but you don't have to disrupt existing values or the column definition per se.
The only trick is to remember to not specify the value for TrackingNumber, and let the DB do its thing.
Sequences are cool in that you can have one sequence that is used by multiple tables, giving you somewhat shorter db-wide unique IDs than alternatives in the past. For such an application, you'd probably be better off with a bigint column - or know that the tables in question aren't going to be terribly long.
I ended up creating a new table and moving data in there
We have a tool and this tool create some insert scripts to add rows in our plsql table.
this scripts is not modifiable and we can't see this scripts. so,
when data row comes (with insert script that we don't know structure), we should give a primary key. we can use trigger but we don't want do this for reasons of performance.
Below code doesn't work.
CREATE TABLE qname
(
qname_id integer NOT NULL default qname_id_seq.nextval PRIMARY KEY,
);
Any idea?
Thanks..
.nextval cannot be used in Default Value of table, This is achieved by Trigger and Sequence when you want serialized number that anyone can easily read/remember/understand. But if you don't want to manage ID Column (like qname_id) by this way, and value of this column is not much considerable, you can use SYS_GUID() at Table Creation to get Auto Increment like this.
CREATE TABLE qname
(qname_id RAW(16) DEFAULT SYS_GUID() PRIMARY KEY,
name VARCHAR2(30));
(or by Modifying Column)
Now your qname_id column will accept "globally unique identifier value".
you can insert value in table by ignoring emp_id column like this.
INSERT INTO qname (name) VALUES ('name value');
So, it will insert unique value to your qname_id Column.
using replication in sql srv causes the addition of this guid field, it also adds a value to it
but when i insert new records to the db, i have to give somthing or the guid field
it should be like aaaaa-aaa-something and unique!!
this is a problem for me , how am i supposed to do this keeping it unique every time?
should sql srv automatically add some yhing?
The ROWGUIDCOL added by Merge Replication should be populated with... guids:
ROWGUIDCOL does not enforce uniqueness
of the values that are stored in the
column and does not automatically
generate values for new rows that are
inserted into the table. To generate
unique values for each column, either
use the NEWID function on INSERT
statements or specify the NEWID
function as the default for the
column.