Insert column value depending on an autoincrement column - sql

Question

I have table in my SQL Server database with following columns
ID | NAME | DOB | APPLICATION NO |
1 | JOHN | 31/05/1986 | KPL\2014\1 |
2 | MARY | 26/04/1965 | KPL\2014\2 |
3 | VARUN | 15/03/1972 | KPL\2014\3 |
Here column ID is an auto increment column and column APPLICATION NO is dependent on ID.
That means APPLICATION NO is the concatenation of KPL\, YEAR and column value of ID.
Then how can I make an insert query?

Answer 1

Why don't you use a computed column ?
I would change the table's definition.
add a "year" column
add an "application_name" column (if it's not always "KPL").
then create your computed column, with the needed fields
alter table <yourTable> add computed_application_name as (application_name + '/' + CAST(<yearColumn> as VARCHAR(4) + '/' + <otherColumn> + CAST(id as VARCHAR(MAX))

Answer 2

Just use a computed column:
alter table t
add application_no as ('KPL' + cast(year(getdate()) as varchar(255)) + cast(id as varchar(255));
It occurs to me that you really want the year when the row was inserted. For that purpose, I would recommend adding a createdat column and then using that instead of getdate():
alter table t add CreatedAt datetime default getdate();
If you have data in the table, then set the value (this is not needed if the table is empty):
update table t set CreatedAt = getdate();
Then define application_no:
alter table t
add application_no as ('KPL' + cast(year(CreatedAt) as varchar(255)) + cast(id as varchar(255));

Answer 3

Simply use a computed column for 'APPLICATION_NO':
create table tbl (
ID int,
NAME varchar(10),
DOB date,
APPLICATION_NO as ('KPL\'+cast(year(dob) as char(4))+'\'+cast(id as varchar))
)
You can further persist and index it as well.

Answer 4

You can create a trigger to run after insert. In your insert, ignore application_no. And your trigger update this column based on ID.
Something like this:
CREATE TRIGGER [TRIGGER_TABLE1] ON TABLE1
AFTER INSERT
AS
BEGIN
UPDATE TABLE1
SET APPLICATION_NO = 'KPL\' + CONVERT(VARCHAR, YEAR(GETDATE())) + '\' + CONVERT(VARCHAR, ID)
WHERE APPLICATION_NO IS NULL
END
EDIT: This way, you should be able to use other columns values as well. APPLICATION_NO just need to accept NULL values. So you control like this what will be updated or not.

Answer 5

Use SCOPE_IDENTITY get the inserted record Id
Declare #Id INT
Insert Into TABLENAME(NAME ,DOB )
Values('Name','1/1/1990')
Set #Id=SCOPE_IDENTITY()
IF(#Id>0)
begin
declare #col varchar(100)=''
set #col= 'KPL\' + CONVERT(varchar(4),YEAR(GETDATE()))+'\' + CONVERT(varchar(4),#Id)
Update TABLENAME
SET APPLICATIONNO= #col
Where ID = #id
end

Answer 6

If you really want to do it by yourself with an insert statement:
assuming that you want to insert data from another table
and TABLE1 is the table you described in your question and TABLE2 would be the table you want to import data from:
DECLARE #MAXID INT
SELECT #MAXID = MAX(ID) FROM TABLE1
INSERT INTO TABLE1
(NAME,DOB,APPLICATION_NO)
SELECT
NAME,
DOB,
'KPL\'
+ CONVERT(CHAR(4),YEAR(GETDATE()) +'\'
+ CONVERT(VARCHAR(25), #MAXID + ROW_NUMBER() OVER (ORDER BY NAME)) AS APPLICATION_NO
FROM TABLE2