Hello all, I have a table with 'ID' as the primary key and in is an int column. How do I make this an autoincrement column? Regards, Kinyanjui. 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. A primary key is a column or a group of columns used to identify a row uniquely in a table. You define primary keys through primary key constraints. Technically, a primary key constraint is the combination of a not-null constraint and a UNIQUE constraint. A table can have one and only one primary key.

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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+')

2.insert into occupation('+pid+','+occupation+','+dept+')

License key generator for pc games. please let me know the status.

Thank you,

AUTO INCREMENT Field

Auto-increment allows a unique number to be generated automatically when a new record is inserted into a table.

Often this is the primary key field that we would like to be created automatically every time a new record is inserted.

Syntax for MySQL

Primary Key Adalah

The following SQL statement defines the 'Personid' column to be an auto-increment primary key field in the 'Persons' table:

MySQL uses the AUTO_INCREMENT keyword to perform an auto-increment feature.

By default, the starting value for AUTO_INCREMENT is 1, and it will increment by 1 for each new record.

To let the AUTO_INCREMENT sequence start with another value, use the following SQL statement:

To insert a new record into the 'Persons' table, we will NOT have to specify a value for the 'Personid' column (a unique value will be added automatically):

The SQL statement above would insert a new record into the 'Persons' table. The 'Personid' column would be assigned a unique value. The 'FirstName' column would be set to 'Lars' and the 'LastName' column would be set to 'Monsen'.

Syntax for SQL Server

The following SQL statement defines the 'Personid' column to be an auto-increment primary key field in the 'Persons' table:

Union Auto Generate Primary Key Views

The MS SQL Server uses the IDENTITY keyword to perform an auto-increment feature.

In the example above, the starting value for IDENTITY is 1, and it will increment by 1 for each new record.

Tip: To specify that the 'Personid' column should start at value 10 and increment by 5, change it to IDENTITY(10,5).

To insert a new record into the 'Persons' table, we will NOT have to specify a value for the 'Personid' column (a unique value will be added automatically):

The SQL statement above would insert a new record into the 'Persons' table. The 'Personid' column would be assigned a unique value. The 'FirstName' column would be set to 'Lars' and the 'LastName' column would be set to 'Monsen'.

Pengertian Primary Key

Syntax for Access

The following SQL statement defines the 'Personid' column to be an auto-increment primary key field in the 'Persons' table:

The MS Access uses the AUTOINCREMENT keyword to perform an auto-increment feature.

By default, the starting value for AUTOINCREMENT is 1, and it will increment by 1 for each new record.

Tip: To specify that the 'Personid' column should start at value 10 and increment by 5, change the autoincrement to AUTOINCREMENT(10,5).

To insert a new record into the 'Persons' table, we will NOT have to specify a value for the 'Personid' column (a unique value will be added automatically):

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The SQL statement above would insert a new record into the 'Persons' table. The 'Personid' column would be assigned a unique value. The 'FirstName' column would be set to 'Lars' and the 'LastName' column would be set to 'Monsen'.

Syntax for Oracle

In Oracle the code is a little bit more tricky.

You will have to create an auto-increment field with the sequence object (this object generates a number sequence).

Union Auto Generate Primary Key View Free

Union Auto Generate Primary Key Viewer

Use the following CREATE SEQUENCE syntax:

The code above creates a sequence object called seq_person, that starts with 1 and will increment by 1. It will also cache up to 10 values for performance. The cache option specifies how many sequence values will be stored in memory for faster access.

Union Auto Generate Primary Key View For Kids

To insert a new record into the 'Persons' table, we will have to use the nextval function (this function retrieves the next value from seq_person sequence):

The SQL statement above would insert a new record into the 'Persons' table. The 'Personid' column would be assigned the next number from the seq_person sequence. The 'FirstName' column would be set to 'Lars' and the 'LastName' column would be set to 'Monsen'.

Foreign Key