SQL server identity column values start at 0 instead of 1

Question

I\'ve got a strange situation with some tables in my database starting its IDs from 0, even though TABLE CREATE has IDENTITY(1,1). This is so for some tables, but not for ot

Answer 1

Try this

DECLARE @c TABLE (TanvtechId varchar(10),NewTanvtechId Varchar(10))
INSERT INTO @c
SELECT TanvtechId , Row_Number() OVER (ORDER BY TanvtechId ) from Tanvtech 

UPDATE G
SET G.TanvtechId =a.NewTanvtechId 
FROM Tanvtech as G INNER JOIN @c as a ON a.TanvtechId =G.TanvtechId