Sql server 如果达到标识列的最大值，将附加什么？

可能重复：

如果SQL server表的标识列（表示int）达到int的最大容量，那么会追加什么

回到开始

假设直线的长度为100乘以100。每次插入100行新行时，都会删除100行旧行

谢谢你的回答

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致以最诚挚的问候

它将不允许您插入更多的行。

当您超过最大int值时，将出现算术溢出错误

试试看：

DECLARE @t TABLE (
    id INT IDENTITY (2147483647,1), 
    name VARCHAR(100)
)


INSERT INTO @t (name) VALUES ('Joe')  
INSERT INTO @t (name) VALUES ('Tim')

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我不知道的是，无论本地标识字段定义为什么，标识函数（、和）都返回一个十进制（38,0）值

正如其他人所指出的，错误消息的性质相同 将标识转换为数据类型X时出现算术溢出错误

当你问关于SQL Server的问题时，我的恐怖故事是MySQL 4.trash是一个旧工作中的遗留应用程序，它在tinyint上定义了一个标识。当溢出时，它没有爆炸，只是不断插入具有相同id的行（我知道，PK应该阻止它，但它是一个非常糟糕的db设计）

@Joe Stefanelli已经提供了一个生成错误的框架，但是为了我自己的教育，我把它吹了出来，以涵盖bigint和decimal

SET NOCOUNT ON

IF EXISTS (select 1 from sys.tables T WHERE T.name = 'Tim' AND SCHEMA_NAME(t.schema_id) = 'dbo')
BEGIN
    DROP TABLE dbo.Tim
END

IF EXISTS (select 1 from sys.tables T WHERE T.name = 'Tim_decimal' AND SCHEMA_NAME(t.schema_id) = 'dbo')
BEGIN
    DROP TABLE dbo.Tim_decimal
END

IF EXISTS (select 1 from sys.tables T WHERE T.name = 'Tim_bigint' AND SCHEMA_NAME(t.schema_id) = 'dbo')
BEGIN
    DROP TABLE dbo.Tim_bigint
END    
-- http://msdn.microsoft.com/en-us/library/ms187342.aspx

CREATE TABLE 
    dbo.Tim
(
    tim_id int identity(2147483646 , 1) NOT NULL PRIMARY KEY
,   val int 
)

BEGIN TRY
    -- consumes the first value
    INSERT INTO
        dbo.Tim
    SELECT
        0 AS number

    SELECT SCOPE_IDENTITY() AS last_int_identity

    -- this insert brings us to the edge

    INSERT INTO
        dbo.Tim
    SELECT
        1 AS number

    SELECT SCOPE_IDENTITY() AS last_int_identity

    -- This one goes kaboom
    --Msg 8115, Level 16, State 1, Line 27
    --Arithmetic overflow error converting IDENTITY to data type int.
    INSERT INTO
        dbo.Tim
    SELECT
        -1 AS number
END TRY
BEGIN CATCH
    SELECT
        ERROR_NUMBER() AS ErrorNumber
    ,   ERROR_SEVERITY() AS ErrorSeverity
    ,   ERROR_STATE() AS ErrorState
    ,   ERROR_PROCEDURE() AS ErrorProcedure
    ,   ERROR_LINE() AS ErrorLine
    ,   ERROR_MESSAGE() AS ErrorMessage
END CATCH

bigint版本

----------------------------------------------
-- Try again with big ints
----------------------------------------------
SET NOCOUNT ON

CREATE TABLE 
    dbo.Tim_bigint
(
    tim_id bigint identity(9223372036854775806, 1) NOT NULL PRIMARY KEY
,   val int 
)

BEGIN TRY
    -- consumes the first value
    INSERT INTO
        dbo.Tim_bigint
    SELECT
        0 AS number

    SELECT SCOPE_IDENTITY() AS last_bigint_identity

    -- this insert brings us to the edge

    INSERT INTO
        dbo.Tim_bigint
    SELECT
        1 AS number

    SELECT SCOPE_IDENTITY() AS last_bigint_identity

    -- This one goes kaboom
    --Msg 8115, Level 16, State 1, Line 27
    --Arithmetic overflow error converting IDENTITY to data type bigint.
    INSERT INTO
        dbo.Tim_bigint
    SELECT
        -1 AS number
END TRY
BEGIN CATCH
    SELECT
        ERROR_NUMBER() AS ErrorNumber
    ,   ERROR_SEVERITY() AS ErrorSeverity
    ,   ERROR_STATE() AS ErrorState
    ,   ERROR_PROCEDURE() AS ErrorProcedure
    ,   ERROR_LINE() AS ErrorLine
    ,   ERROR_MESSAGE() AS ErrorMessage
END CATCH

十进制版本

----------------------------------------------
-- Let's really max this out
----------------------------------------------
SET NOCOUNT ON

CREATE TABLE 
    dbo.Tim_decimal
(
    -- 10^38 -1
    -- 10^37 = 10000000000000000000000000000000000000
    -- 10^38 = 100000000000000000000000000000000000000
    tim_id decimal(38,0) identity(99999999999999999999999999999999999998, 1) NOT NULL PRIMARY KEY
,   val int 
)

BEGIN TRY
    -- consumes the first value
    INSERT INTO
        dbo.Tim_decimal
    SELECT
        0 AS number

    SELECT SCOPE_IDENTITY() AS last_decimal_identity


    -- this insert brings us to the edge

    INSERT INTO
        dbo.Tim_decimal
    SELECT
        1 AS number

    SELECT SCOPE_IDENTITY() AS last_decimal_identity

    -- This one goes kaboom
    --Msg 8115, Level 16, State 1, Line 27
    --Arithmetic overflow error converting IDENTITY to data type decimal.
    INSERT INTO
        dbo.Tim_decimal
    SELECT
        -1 AS number
END TRY
BEGIN CATCH
    SELECT
        ERROR_NUMBER() AS ErrorNumber
    ,   ERROR_SEVERITY() AS ErrorSeverity
    ,   ERROR_STATE() AS ErrorState
    ,   ERROR_PROCEDURE() AS ErrorProcedure
    ,   ERROR_LINE() AS ErrorLine
    ,   ERROR_MESSAGE() AS ErrorMessage
END CATCH

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如果在插入之前使用SET ARITHABORT OFF？：-）嗯。。。相同的。