Question

How can I create a primary key in SQL Server 2005/2008 of the format CurrentYear + auto-increment? If current year is 2010, in a new table ID should start at 1, so: 20101, 20102, 20103, 20104, 20105 and so on.

Answer 1

This technically meets the needs of what you requested:

CREATE TABLE #test
        ( seeded_column INT IDENTITY(1,1) NOT NULL
        , year_column INT NOT NULL DEFAULT(YEAR(GETDATE()))
        , calculated_column AS CONVERT(BIGINT, CONVERT(CHAR(4), year_column, 120) + CONVERT(VARCHAR(MAX), seeded_column)) PERSISTED PRIMARY KEY
        , test VARCHAR(MAX) NOT NULL);

INSERT INTO #test (test)
SELECT 'Badda'
UNION ALL
SELECT 'Cadda'
UNION ALL
SELECT 'Dadda'
UNION ALL
SELECT 'Fadda'
UNION ALL
SELECT 'Gadda'
UNION ALL
SELECT 'Hadda'
UNION ALL
SELECT 'Jadda'
UNION ALL
SELECT 'Kadda'
UNION ALL
SELECT 'Ladda'
UNION ALL
SELECT 'Madda'
UNION ALL
SELECT 'Nadda'
UNION ALL
SELECT 'Padda';

SELECT *
FROM #test;

DROP TABLE #test;