in same table a column must be added which concatenates the id (unique +1) and name automaticly

Question

1.00/5 (1 vote)

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SQL

create table cust
(
id int identity(1,1),
cname varchar(20),
myid varchar(50)
)

----------------------------------------------------

i want to store this in myid column automatically

SQL

select cname+''+convert(varchar(50),id) as myid from cust where id=max(id)+1

id		cname		myid
-------------------------------------------------------
1		abc		abc1

Posted 11-Oct-14 20:17pm

vijay_d_b

Updated 11-Oct-14 23:23pm

Nelek

v3

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2 solutions

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CHill60 · Accepted Answer · 2014-10-12T01:16:00

Solution 1

Create a "for insert" trigger[^] on the table and place your code to "calculate" [myid] in there.

See these CP articles for more information
Triggers -- SQL Server[^]
Be Very Careful When You Write SQL Trigger[^]
SQL:Target a Trigger[^]

Posted 12-Oct-14 1:16am

CHill60

Comments

Maciej Los 12-Oct-14 15:21pm

Good one, +5!
Please, see my answer ;)

Maciej Los · Accepted Answer · 2014-10-12T09:20:00

Solution 2

I'd suggest you to use stored procedure.

SQL

CREATE PROCEDURE uspNewCustomer
    @custname NVARCHAR(50)
BEGIN
    DECLARE @myid INT = 0 --in case of error, return zero

    INSERT INTO Customers (CustomerName) VALUES(@custname)
    SET @myid = @@IDENTITY()

    UPDATE Customers SET MyID = CustomerName + CONVERT(VARCHAR(10), @myid)

    --RETURN newely inserted value
    SELECT @myid

END

For further information, please see:
Table Column Properties (SQL Server Management Studio)[^]
CREATE PROCEDURE[^]
Specify Default Values for Columns[^]
@@IDENTITY[^]
Return Data from a Stored Procedure[^]

Posted 12-Oct-14 9:20am

Maciej Los

Comments

vijay_d_b 13-Oct-14 4:48am

thanx 4 ur reply ,i tried like this n working fine ,let me know is it correct way.
CREATE PROCEDURE uspNewCustomer

@cname VARCHAR(50)
AS
BEGIN
declare @id int
DECLARE @myid int
INSERT INTO cust(cname)values(@cname)

UPDATE cust SET myid = cname+''+convert(varchar(10),isnull(id,0))

SELECT (cname+''+convert(varchar(10),isnull(id,0))) as myid from cust
END

Maciej Los 13-Oct-14 4:53am

Why to use last select statement, if the value of myID has been already added to the table (via UPDATE statement)?