- Can I Auto Generate Primary Key Excel
- Can I Auto Generate Primary Key Of India
- Can I Auto Generate Primary Key Data
- Can I Auto Generate Primary Key Id
- I have a table set up that currently has no primary key. All I need to do is add a primary key, no null, autoincrement. I'm working with a Microsoft SQL Server database. I understand that it can't be done in a single command but every command I try keeps returning syntax errors.
- For MyISAM tables, you can specify AUTOINCREMENT on a secondary column in a multiple-column index. In this case, the generated value for the AUTOINCREMENT column is calculated as MAX(autoincrementcolumn) + 1 WHERE prefix=given-prefix. This is useful when you want to put data into ordered groups.
- Mar 24, 2020 Auto increment attribute when specified on a column with a numeric data types, generates numbers sequentially whenever a new row is added into the database. The Auto increment is commonly used to generate primary keys. The defined data type on the Auto increment should be large enough to accommodate many records.
- Oct 01, 2001 Hi, I have the same problem of Mr. I think that the last answer, gine by Michael Kelly doesn't solve the problem. This implies that FIRST you have to insert one row in the master table and AFTER,once I have obtained the primary key from the sequence, in the detail.
Sep 14, 2009 Hello, I'm trying to create a primary key that will auto-generate. I have tried using a unique identifier and setting the default value/binding to newid but I still have to explicitly use newid when inserting rows or it will complain about a null id.
Re: How To Auto Increment Alphanumeric Primary Key In sql server 2008
Jul 12, 2013 12:52 AMRagavanBLINK
Hi Manish,
try like this sample,
Personal detail:
create table personaldetail(id bigint identity primary key,pid nvarchar(20) unique,name nvarchar(25),addres nvarchar(100))
Occupation:
create table occupation(id bigint identity primary key,pid nvarchar(20) references personaldetail(pid),occupation nvarchar(25),dept nvarchar(25))
then generate the pid at code behind like,
public string generate_ID(){
int id=0;
string pid;
string pidquery = 'select top 1 SUBSTRING(pid,4,len(piid))as pid from personal detail order by pid desc';
// here 4 char denotes number after prefix string('HUA')
SqlCommand scmd = new SqlCommand(pidquery, con);
SqlDataAdapter adapter = new SqlDataAdapter(pidquery, con);
DataTable restable = new DataTable();
adapter.Fill(restable);
if (restable.Rows.Count > 0)
{
SqlDataReader reader = scmd.ExecuteReader();
reader.Read();
id= Convert.ToInt32(reader['pid']);
id= id+ 1;
pid = 'HUA' + Convert.ToString(id);
}
else // its for if no data in db
{
id= 1;
pid = 'HUA' + Convert.ToString(jid);
}
return pid;
}
after got id:
insert into both tables like:
1. insert into personaldetail('+pid+','+name+','+addr+')
Endnote x4 product key generator. 2.insert into occupation('+pid+','+occupation+','+dept+')
please let me know the status.
Thank you,
-->You can define a primary key in SQL Server by using SQL Server Management Studio or Transact-SQL. Creating a primary key automatically creates a corresponding unique clustered index, or a nonclustered index if specified as such.
Before You Begin
Limitations and Restrictions
A table can contain only one PRIMARY KEY constraint.
All columns defined within a PRIMARY KEY constraint must be defined as NOT NULL. If nullability is not specified, all columns participating in a PRIMARY KEY constraint have their nullability set to NOT NULL.
Security
Permissions
Creating a new table with a primary key requires CREATE TABLE permission in the database and ALTER permission on the schema in which the table is being created.
Creating a primary key in an existing table requires ALTER permission on the table.
Using SQL Server Management Studio
To create a primary key
- In Object Explorer, right-click the table to which you want to add a unique constraint, and click Design.
- In Table Designer, click the row selector for the database column you want to define as the primary key. If you want to select multiple columns, hold down the CTRL key while you click the row selectors for the other columns.
- Right-click the row selector for the column and select Set Primary Key.
Caution
If you want to redefine the primary key, any relationships to the existing primary key must be deleted before the new primary key can be created. A message will warn you that existing relationships will be automatically deleted as part of this process.
A primary key column is identified by a primary key symbol in its row selector.
If a primary key consists of more than one column, duplicate values are allowed in one column, but each combination of values from all the columns in the primary key must be unique.
If you define a compound key, the order of columns in the primary key matches the order of columns as shown in the table. However, you can change the order of columns after the primary key is created. For more information, see Modify Primary Keys.
Using Transact-SQL
Can I Auto Generate Primary Key Excel
To create a primary key in an existing table
The following example creates a primary key on the column TransactionID in the AdventureWorks database.
To create a primary key in a new table
The following example creates a table and defines a primary key on the column TransactionID in the AdventureWorks database.
Can I Auto Generate Primary Key Of India
To create a primary key with clustered index in a new table
Can I Auto Generate Primary Key Data
The following example creates a table and defines a primary key on the column CustomerID and a clustered index on TransactionID in the AdventureWorks database.