标识列是否从指定的种子开始

Question

Referring to the image attached below which is from SQL Server Management Studio, I have a table with records in it already, and the last record has an id of 7 . I wish to have this column auto increment as the primary key (as it did before some unknown stuff-up), obviously with the next record having an id of 8 .

Will specifying the seed as 7 mean the next record will be given an id of 7? Or will it be (7 + incrementValue) giving 8?

Answer 1

SQL Server is intelligent enough, any value you give from 1 to 8 it will start from 8 only.

For example if you give the Identity Seed as 1, and insert a record to the table, SQL will calculate the new Identity as 8 only.

If you specify > 8 in that case only it will consider the seed value.

Note: When you are using SSMS to achieve this, internally table will be dropped and a new table will be created with proper identity.

If you want to do this using an sql query, you have to follow the instruction mentioned in this answer

Answer 2

Suppose your table is large,then you have to query to find max id

Simply do this,

DBCC CHECKIDENT ('TableName', RESEED, 1) 

Answer 3

我认为SQL Server将迫使您重新创建具有新标识的表，并且您将不得不将数据移到该表中，该表将从1开始并以1递增。