时间历史表
我们JCC将Oracle的数据提取到SQL Server 2016。由于某些未知原因，历史记录表中有相同的开始和结束时间。怎么会发生？我尝试使用条件SET Column = Column更新记录。在这种情况下，我有2条记录，其中所有字段都相同，但开始和结束时间不同。如果有相同的日期时间怎么可能呢？
更新：
DDL：
CREATE TABLE [dbo].[LEASES](
[LEASE_NUMBER] [CHAR](7) NOT NULL,
[CREDIT_DECISION_CODE] [CHAR](1) NULL,
[LEASE_APPLICATION] [CHAR](7) NULL,
[ACCOUNT_NUMBER] [CHAR](8) NULL,
[CELLULAR_NUMBER] [CHAR](10) NULL,
[DEALER_CODE] [CHAR](5) NULL,
[USERNAME] [CHAR](12) NULL,
[LEASE_DATE] [DATETIME2](7) NULL,
[NEW_USED_FLAG] [CHAR](1) NULL,
[MANUFACTURER_CODE] [CHAR](6) NULL,
[MODEL] [CHAR](10) NULL,
[SERIAL_NUMBER_ELECTRONIC] [INT] NULL,
[SERIAL_NUMBER_MECHANICAL] [CHAR](10) NULL,
[CONTROL_HEAD] [CHAR](12) NULL,
[LEASE_TERM] [SMALLINT] NULL,
[LESSEE_CITY] [CHAR](17) NULL,
[LESSEE_ADDRESS_1] [CHAR](30) NULL,
[LESSEE_ADDRESS_2] [CHAR](30) NULL,
[LESSEE_STATE] [CHAR](2) NULL,
[LESSEE_ZIP_CODE] [CHAR](9) NULL,
[LESSEE_NAME] [CHAR](30) NULL,
[KEY_NAME] [CHAR](12) NULL,
[BASE_PAYMENT] [DECIMAL](10, 2) NULL,
[MONTHLY_SALES_TAX] [DECIMAL](10, 2) NULL,
[INSURANCE] [DECIMAL](10, 2) NULL,
[MONTHLY_PAYMENT] [DECIMAL](10, 2) NULL,
[SECURITY_DEPOSIT] [DECIMAL](10, 2) NULL,
[INVOICES_GENERATED_COUNT] [SMALLINT] NULL,
[DATE_LAST_INVOICED] [DATETIME] NULL,
[DATE_LAST_LATE_FEE] [DATETIME] NULL,
[SECURITY_DEPOSITS_INVOICED] [DECIMAL](10, 2) NULL,
[SECURITY_DEPOSITS_REFUNDED] [DECIMAL](10, 2) NULL,
[ADVANCE_RENT] [DECIMAL](10, 2) NULL,
[ADVANCE_SALES_TAX] [DECIMAL](10, 2) NULL,
[TOTAL_ADVANCE_PAYMENT] [DECIMAL](10, 2) NULL,
[AUTO_LEASE_EXPIRATION_DATE] [CHAR](4) NULL,
[PAYMENTS_REMAINING] [SMALLINT] NULL,
[PV_PAYMENTS_REMAINING] [DECIMAL](10, 2) NULL,
[TAX_RATE] [DECIMAL](10, 4) NULL,
[TAX_STATE] [CHAR](2) NULL,
[LEASE_FACTOR] [DECIMAL](10, 4) NULL,
[AMOUNT_FINANCED] [DECIMAL](10, 2) NULL,
[REMARKS] [CHAR](60) NULL,
[VOUCHER_NUMBER] [CHAR](12) NULL,
[BILL_METHOD_ADVANCE] [CHAR](1) NULL,
[FINANCING_PACKAGE] [INT] NULL,
[BUYOUT_AMOUNT] [DECIMAL](10, 2) NULL,
[BUYOUT_DATE] [DATETIME] NULL,
[DEPRECIATION_MONTHS] [SMALLINT] NULL,
[SALVAGE_VALUE] [DECIMAL](10, 2) NULL,
[LAST_DEPRECIATION_DATE] [DATETIME] NULL,
[LAST_DEPRECIATION_AMOUNT] [DECIMAL](10, 2) NULL,
[ACCUMULATED_DEPRECIATION] [DECIMAL](10, 2) NULL,
[BILL_METHOD_BUYOUT] [CHAR](1) NULL,
[BUYOUT_INVOICED] [CHAR](1) NULL,
[RECEIVED_DATE] [DATETIME] NULL,
[LEASE_PROGRAM] [CHAR](5) NULL,
[PAYMENTS_INCLUDED_ADVANCE] [SMALLINT] NULL,
[SALESPERSON_CODE] [CHAR](5) NULL,
[UNGUARANTEED_RESIDUAL_VALUE] [DECIMAL](10, 2) NULL,
[UNEARNED_INCOME] [DECIMAL](10, 2) NULL,
[DIRECT_COST] [DECIMAL](10, 2) NULL,
[AMORTIZABLE_UNEARNED_INCOME] [DECIMAL](10, 2) NULL,
[AMORTIZED_FLAG] [CHAR](1) NULL,
[RESIDUAL_VALUE_PERCENTAGE] [DECIMAL](10, 4) NULL,
[MINIMUM_LEASE_PAYMENTS] [DECIMAL](10, 2) NULL,
[IMPLICIT_MONTHLY_INTEREST_RATE] [DECIMAL](10, 8) NULL,
[AP_POSTED_FLAG] [CHAR](1) NULL,
[AP_POSTED_DATE] [DATETIME] NULL,
[CAPITALIZED_LEASE_FLAG] [CHAR](1) NULL,
[LEASE_STATUS] [CHAR](1) NULL,
[GROSS_INVESTMENT] [DECIMAL](10, 2) NULL,
[ADVANCE_BILLED_FLAG] [CHAR](1) NULL,
[AP_VOUCHER_NUMBER] [CHAR](12) NULL,
[BANK_PACKAGE] [CHAR](5) NULL,
[INSURANCE_BINDER] [CHAR](1) NULL,
[CURRENT_BUYOUT] [DECIMAL](10, 2) NULL,
[LEASE_AGE_YEARS] [SMALLINT] NULL,
[GUARANTOR_NAME] [CHAR](30) NULL,
[GUARANTOR_ADDRESS_LINE_1] [CHAR](30) NULL,
[GUARANTOR_ADDRESS_LINE_2] [CHAR](30) NULL,
[GUARANTOR_CITY] [CHAR](17) NULL,
[GUARANTOR_STATE] [CHAR](2) NULL,
[GUARANTOR_ZIP] [CHAR](9) NULL,
[GUARANTOR_TELEPHONE] [CHAR](18) NULL,
[GUARANTOR_SS_NUMBER] [CHAR](9) NULL,
[GUARANTOR] [CHAR](30) NULL,
[BILL_CYCLES_DEFER] [INT] NULL,
[REVENUE_ACCOUNT] [CHAR](5) NULL,
[INVOICE_TYPE] [CHAR](5) NULL,
[CORRESPONDENCE_FLAG] [CHAR](1) NULL,
[DOWN_PAYMENT] [DECIMAL](10, 2) NULL,
[ADVANCE_INSURANCE] [DECIMAL](10, 2) NULL,
[ORIGINAL_EQUIPMENT_COST] [DECIMAL](10, 2) NULL,
[SERVICING_DEALER_CODE] [CHAR](5) NULL,
[DEALER_BUYOUT_DATE] [DATETIME] NULL,
[LEASE_OWNER_CODE] [CHAR](5) NULL,
[LEASE_OWNER_DATE] [DATETIME] NULL,
[VENDOR_CODE] [CHAR](5) NULL,
[SPLIT_FUNDING_COUNT] [SMALLINT] NULL,
[DEALER_AMOUNT] [DECIMAL](10, 2) NULL,
[VENDOR_AMOUNT] [DECIMAL](10, 2) NULL,
[SALESPERSON_AMOUNT] [DECIMAL](10, 2) NULL,
[DEALER_OFFICE] [SMALLINT] NULL,
[ASSESSMENT_YEAR] [SMALLINT] NULL,
[PROPERTY_TAX_RATE] [DECIMAL](10, 4) NULL,
[ASSESSMENT_FACTOR] [DECIMAL](10, 4) NULL,
[MONTHLY_PROPERTY_TAX] [DECIMAL](10, 2) NULL,
[MANAGER_CODE] [CHAR](5) NULL,
[DEALER_BUYOUT_PROGRAM] [CHAR](5) NULL,
[SHARED_RESID_METHOD] [CHAR](1) NULL,
[SHARED_RESID_AMOUNT] [DECIMAL](10, 2) NULL,
[SHARED_RESID_PERCENT] [DECIMAL](10, 4) NULL,
[SHARED_RESID_L_AND_D] [CHAR](1) NULL,
[SHARED_RESID_COLLECTION_TYPE] [CHAR](1) NULL,
[SHARED_RESID_MONTHS_OVERDUE] [SMALLINT] NULL,
[ORIGINAL_LEASE_TERM] [SMALLINT] NULL,
[ORIGINAL_LEASE_DATE] [DATETIME] NULL,
[ORIGINAL_BASE_PAYMENT] [DECIMAL](10, 2) NULL,
[ORIGINAL_MINIMUM_PAYMENTS] [DECIMAL](10, 2) NULL,
[NEW_PAYMENT_PLAN_FLAG] [CHAR](1) NULL,
[NEW_PAYMENT_PLAN_OFFSET] [SMALLINT] NULL,
[NEW_PAYMENT_PLAN_DATE] [DATETIME] NULL,
[NEW_MINIMUM_PAYMENTS] [DECIMAL](10, 2) NULL,
[BILLING_PERIOD_NUMBER] [SMALLINT] NULL,
[BILLING_PERIOD_1_INVOICES] [SMALLINT] NULL,
[BILLING_PERIOD_1_PAYMENT] [DECIMAL](10, 2) NULL,
[BILLING_PERIOD_2_INVOICES] [SMALLINT] NULL,
[BILLING_PERIOD_2_PAYMENT] [DECIMAL](10, 2) NULL,
[BILLING_PERIOD_3_INVOICES] [SMALLINT] NULL,
[BILLING_PERIOD_3_PAYMENT] [DECIMAL](10, 2) NULL,
[BILLING_PERIOD_4_INVOICES] [SMALLINT] NULL,
[BILLING_PERIOD_4_PAYMENT] [DECIMAL](10, 2) NULL,
[BILLING_PERIOD_5_INVOICES] [SMALLINT] NULL,
[BILLING_PERIOD_5_PAYMENT] [DECIMAL](10, 2) NULL,
[BILLING_PERIOD_6_INVOICES] [SMALLINT] NULL,
[BILLING_PERIOD_6_PAYMENT] [DECIMAL](10, 2) NULL,
[EQUIPMENT_AMOUNT] [DECIMAL](10, 2) NULL,
[SERVICE_AMOUNT] [DECIMAL](10, 2) NULL,
[MONTHS_OF_RECOURSE] [SMALLINT] NULL,
[VENDOR_PAID_FLAG] [CHAR](1) NULL,
[SALESPERSON_PAID_FLAG] [CHAR](1) NULL,
[AP_ACCOUNT] [CHAR](5) NULL,
[GL_AP_ACCOUNT] [CHAR](4) NULL,
[GL_OWNER_COMPANY] [CHAR](4) NULL,
[GL_BRANCH] [CHAR](1) NULL,
[GL_DEPARTMENT] [CHAR](2) NULL,
[GL_EQUIPMENT] [CHAR](2) NULL,
[GL_STATE] [CHAR](2) NULL,
[DEALER_RECOURSE_PERCENT] [DECIMAL](10, 4) NULL,
[VENDOR_RECOURSE_PERCENT] [DECIMAL](10, 4) NULL,
[SALESPERSON_RECOURSE_PERCENT] [DECIMAL](10, 4) NULL,
[NUMBER_OF_UNITS] [SMALLINT] NULL,
[INVOICES_SUBJECT_TO_DISCOUNT] [CHAR](1) NULL,
[ORIGINAL_LEASE_PROGRAM] [CHAR](5) NULL,
[MISSING_PAYMENT_COUNT] [SMALLINT] NULL,
[BROKER_CODE] [CHAR](5) NULL,
[REVENUE_SHARING_CODE] [CHAR](5) NULL,
[REVENUE_SHARING_FACTOR] [DECIMAL](5, 2) NULL,
[REVENUE_SHARING_FLAG] [CHAR](1) NULL,
[DEALER_SHARING_CODE] [CHAR](5) NULL,
[DEALER_SHARING_FACTOR] [DECIMAL](5, 2) NULL,
[DEALER_SHARING_FLAG] [CHAR](1) NULL,
[CHARGEBACK_RESERVE_FLAG] [CHAR](1) NULL,
[FUNDING_FEE] [DECIMAL](10, 2) NULL,
[FUNDING_FEE_INVOICED_FLAG] [CHAR](1) NULL,
[LEASE_REFERENCE] [CHAR](30) NULL,
[ORIGINAL_LEASE_NUMBER] [CHAR](12) NULL,
[ORIGINAL_ACCOUNT_NUMBER] [CHAR](12) NULL,
[BASE_PAYMENT_TAXABLE] [CHAR](1) NULL,
[DAY_TO_CHARGE_BACK] [SMALLINT] NULL,
[LESSEE_FED_ID_NUMBER] [CHAR](9) NULL,
[ORIGINAL_PURCHASE_PRICE] [DECIMAL](10, 2) NULL,
[ORIGINAL_PURCHASE_DATE] [DATETIME] NULL,
[ACQUISITION_PURCHASE_PRICE] [DECIMAL](10, 2) NULL,
[ACQUISITION_PURCHASE_DATE] [DATETIME] NULL,
[BROKER_REV_SHAR_AMT_OVERRIDE] [DECIMAL](10, 2) NULL,
[DEALER_REV_SHAR_AMT_OVERRIDE] [DECIMAL](10, 2) NULL,
[UPFRONT_TAX_FLAG] [CHAR](1) NULL,
[UPFRONT_TAX_AMOUNT] [DECIMAL](10, 2) NULL,
[UPFRONT_TAX_BILLED] [CHAR](1) NULL,
[SysStart] [DATETIME2](7) GENERATED ALWAYS AS ROW START NOT NULL,
[SysEnd] [DATETIME2](7) GENERATED ALWAYS AS ROW END NOT NULL,
PRIMARY KEY CLUSTERED
(
[LEASE_NUMBER] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
PERIOD FOR SYSTEM_TIME ([SysStart], [SysEnd])
) ON [PRIMARY]
WITH
(
SYSTEM_VERSIONING = ON ( HISTORY_TABLE = [dbo].[LEASES_HISTORY] )
)
GO
更新2 ：
我无法提供真实数据，但这是我用来获取重复项的查询。请注意，我是GROUPING BY表中的所有列，因此这些是明确的重复：
SELECT LEASE_NUMBER
, SysStart
, SysEnd
, cnt
FROM
( SELECT *
, COUNT(*) cnt
FROM dbo.LEASES_HISTORY AS l
GROUP BY l.LEASE_NUMBER
, l.CREDIT_DECISION_CODE
, l.LEASE_APPLICATION
, l.ACCOUNT_NUMBER
, l.CELLULAR_NUMBER
, l.DEALER_CODE
, l.USERNAME
, l.LEASE_DATE
, l.NEW_USED_FLAG
, l.MANUFACTURER_CODE
, l.MODEL
, l.SERIAL_NUMBER_ELECTRONIC
, l.SERIAL_NUMBER_MECHANICAL
, l.CONTROL_HEAD
, l.LEASE_TERM
, l.LESSEE_CITY
, l.LESSEE_ADDRESS_1
, l.LESSEE_ADDRESS_2
, l.LESSEE_STATE
, l.LESSEE_ZIP_CODE
, l.LESSEE_NAME
, l.KEY_NAME
, l.BASE_PAYMENT
, l.MONTHLY_SALES_TAX
, l.INSURANCE
, l.MONTHLY_PAYMENT
, l.SECURITY_DEPOSIT
, l.INVOICES_GENERATED_COUNT
, l.DATE_LAST_INVOICED
, l.DATE_LAST_LATE_FEE
, l.SECURITY_DEPOSITS_INVOICED
, l.SECURITY_DEPOSITS_REFUNDED
, l.ADVANCE_RENT
, l.ADVANCE_SALES_TAX
, l.TOTAL_ADVANCE_PAYMENT
, l.AUTO_LEASE_EXPIRATION_DATE
, l.PAYMENTS_REMAINING
, l.PV_PAYMENTS_REMAINING
, l.TAX_RATE
, l.TAX_STATE
, l.LEASE_FACTOR
, l.AMOUNT_FINANCED
, l.REMARKS
, l.VOUCHER_NUMBER
, l.BILL_METHOD_ADVANCE
, l.FINANCING_PACKAGE
, l.BUYOUT_AMOUNT
, l.BUYOUT_DATE
, l.DEPRECIATION_MONTHS
, l.SALVAGE_VALUE
, l.LAST_DEPRECIATION_DATE
, l.LAST_DEPRECIATION_AMOUNT
, l.ACCUMULATED_DEPRECIATION
, l.BILL_METHOD_BUYOUT
, l.BUYOUT_INVOICED
, l.RECEIVED_DATE
, l.LEASE_PROGRAM
, l.PAYMENTS_INCLUDED_ADVANCE
, l.SALESPERSON_CODE
, l.UNGUARANTEED_RESIDUAL_VALUE
, l.UNEARNED_INCOME
, l.DIRECT_COST
, l.AMORTIZABLE_UNEARNED_INCOME
, l.AMORTIZED_FLAG
, l.RESIDUAL_VALUE_PERCENTAGE
, l.MINIMUM_LEASE_PAYMENTS
, l.IMPLICIT_MONTHLY_INTEREST_RATE
, l.AP_POSTED_FLAG
, l.AP_POSTED_DATE
, l.CAPITALIZED_LEASE_FLAG
, l.LEASE_STATUS
, l.GROSS_INVESTMENT
, l.ADVANCE_BILLED_FLAG
, l.AP_VOUCHER_NUMBER
, l.BANK_PACKAGE
, l.INSURANCE_BINDER
, l.CURRENT_BUYOUT
, l.LEASE_AGE_YEARS
, l.GUARANTOR_NAME
, l.GUARANTOR_ADDRESS_LINE_1
, l.GUARANTOR_ADDRESS_LINE_2
, l.GUARANTOR_CITY
, l.GUARANTOR_STATE
, l.GUARANTOR_ZIP
, l.GUARANTOR_TELEPHONE
, l.GUARANTOR_SS_NUMBER
, l.GUARANTOR
, l.BILL_CYCLES_DEFER
, l.REVENUE_ACCOUNT
, l.INVOICE_TYPE
, l.CORRESPONDENCE_FLAG
, l.DOWN_PAYMENT
, l.ADVANCE_INSURANCE
, l.ORIGINAL_EQUIPMENT_COST
, l.SERVICING_DEALER_CODE
, l.DEALER_BUYOUT_DATE
, l.LEASE_OWNER_CODE
, l.LEASE_OWNER_DATE
, l.VENDOR_CODE
, l.SPLIT_FUNDING_COUNT
, l.DEALER_AMOUNT
, l.VENDOR_AMOUNT
, l.SALESPERSON_AMOUNT
, l.DEALER_OFFICE
, l.ASSESSMENT_YEAR
, l.PROPERTY_TAX_RATE
, l.ASSESSMENT_FACTOR
, l.MONTHLY_PROPERTY_TAX
, l.MANAGER_CODE
, l.DEALER_BUYOUT_PROGRAM
, l.SHARED_RESID_METHOD
, l.SHARED_RESID_AMOUNT
, l.SHARED_RESID_PERCENT
, l.SHARED_RESID_L_AND_D
, l.SHARED_RESID_COLLECTION_TYPE
, l.SHARED_RESID_MONTHS_OVERDUE
, l.ORIGINAL_LEASE_TERM
, l.ORIGINAL_LEASE_DATE
, l.ORIGINAL_BASE_PAYMENT
, l.ORIGINAL_MINIMUM_PAYMENTS
, l.NEW_PAYMENT_PLAN_FLAG
, l.NEW_PAYMENT_PLAN_OFFSET
, l.NEW_PAYMENT_PLAN_DATE
, l.NEW_MINIMUM_PAYMENTS
, l.BILLING_PERIOD_NUMBER
, l.BILLING_PERIOD_1_INVOICES
, l.BILLING_PERIOD_1_PAYMENT
, l.BILLING_PERIOD_2_INVOICES
, l.BILLING_PERIOD_2_PAYMENT
, l.BILLING_PERIOD_3_INVOICES
, l.BILLING_PERIOD_3_PAYMENT
, l.BILLING_PERIOD_4_INVOICES
, l.BILLING_PERIOD_4_PAYMENT
, l.BILLING_PERIOD_5_INVOICES
, l.BILLING_PERIOD_5_PAYMENT
, l.BILLING_PERIOD_6_INVOICES
, l.BILLING_PERIOD_6_PAYMENT
, l.EQUIPMENT_AMOUNT
, l.SERVICE_AMOUNT
, l.MONTHS_OF_RECOURSE
, l.VENDOR_PAID_FLAG
, l.SALESPERSON_PAID_FLAG
, l.AP_ACCOUNT
, l.GL_AP_ACCOUNT
, l.GL_OWNER_COMPANY
, l.GL_BRANCH
, l.GL_DEPARTMENT
, l.GL_EQUIPMENT
, l.GL_STATE
, l.DEALER_RECOURSE_PERCENT
, l.VENDOR_RECOURSE_PERCENT
, l.SALESPERSON_RECOURSE_PERCENT
, l.NUMBER_OF_UNITS
, l.INVOICES_SUBJECT_TO_DISCOUNT
, l.ORIGINAL_LEASE_PROGRAM
, l.MISSING_PAYMENT_COUNT
, l.BROKER_CODE
, l.REVENUE_SHARING_CODE
, l.REVENUE_SHARING_FACTOR
, l.REVENUE_SHARING_FLAG
, l.DEALER_SHARING_CODE
, l.DEALER_SHARING_FACTOR
, l.DEALER_SHARING_FLAG
, l.CHARGEBACK_RESERVE_FLAG
, l.FUNDING_FEE
, l.FUNDING_FEE_INVOICED_FLAG
, l.LEASE_REFERENCE
, l.ORIGINAL_LEASE_NUMBER
, l.ORIGINAL_ACCOUNT_NUMBER
, l.BASE_PAYMENT_TAXABLE
, l.DAY_TO_CHARGE_BACK
, l.LESSEE_FED_ID_NUMBER
, l.ORIGINAL_PURCHASE_PRICE
, l.ORIGINAL_PURCHASE_DATE
, l.ACQUISITION_PURCHASE_PRICE
, l.ACQUISITION_PURCHASE_DATE
, l.BROKER_REV_SHAR_AMT_OVERRIDE
, l.DEALER_REV_SHAR_AMT_OVERRIDE
, l.UPFRONT_TAX_FLAG
, l.UPFRONT_TAX_AMOUNT
, l.UPFRONT_TAX_BILLED
, l.SysStart
, l.SysEnd
HAVING COUNT(*) > 1
) a;
更新3 ：好的，到目前为止这是我能够获得的新信息。我们尝试捕获rpc_completed个事件以查看实际发生的情况。跟踪文件有7个不同的语句，具有不同的event_sequence个数字。据我所知，这意味着这些陈述是在不同的交易中执行的。我将在稍后尝试准备更详细的更新，但是现在语句正在跟随（除了最后一个语句之外的所有语句都是使用sp_prepexec存储过程执行的）：
该行实际上有三种不同的状态，我们称之为x,y,z
- PK以
x状态更新记录 - 此时DB中没有此类记录 - PK以
y状态更新记录 - 此时数据库中没有此类记录 - 使用
x州 的INSERT记录
- INSERT记录
y状态 - 这违反了PK约束违规 - 更新记录到
x状态 - 实际上没有更改任何行，因此实际记录没有改变 - 将记录更新为
y状态 - 实际记录已更改 - 使用
z过程将记录更新到sp_execute状态，其中handle_id与先前更新相同（更新为z状态）但通过参数传递的值不同< / LI>
所以在这些操作结束时我们有：
原始表格处于z状态，历史记录表具有类似的内容（日期时间是实际值）：
-
x州列，2017-11-01 16：55：31.3358248,2017-11-01 16：55：31.3358248 -
x州列，2017-11-01 16：55：31.3358248,2017-11-01 16：55：31.3358248 -
y州列，2017-11-01 16：55：31.3358248,2017-11-01 16：55：41.9296659
2 个答案:
答案 0 :(得分：3)
时态表使用事务的开始时间作为使用的时间戳（请参阅插入，更新和删除部分下的Temporal Tables in MS Docs）。通过在事务中执行多个更新，或者在同一事务中执行插入后更新，您将获得具有相同开始/结束时间的给定主键值的多个记录。
链接的摘录：
更新：在UPDATE，系统存储行的先前值 在历史表中并将SysEndTime列的值设置为 以当前事务的开始时间 <（strong>）（在UTC时区）为基础 关于系统时钟
以下是重现行为的示例。请注意，ProductsHistory表中的ProductId = 2表中有两个相同的微缩小部件条目。另请注意，尽管ProductId = 1的更新未更改该值，但它们仍会创建相同的历史记录表记录。
create table test.Products (
ProductId int not null primary key,
ProductName nvarchar(100) not null,
EffectiveDate datetime2(7) generated always as row start hidden not null,
EndingDate datetime2(7) generated always as row end hidden not null,
period for system_time (EffectiveDate, EndingDate)
)
with (system_versioning = on (history_table = test.ProductsHistory));
go
begin tran
insert test.Products (ProductId, ProductName) values
(1, N'Widgets'),
(2, N'Miniature Widgets');
update test.Products set ProductName = 'Tiny Widgets' where ProductId = 2;
update test.Products set ProductName = 'Miniature Widgets' where ProductId = 2;
update test.Products set ProductName = 'Tiny Widgets' where ProductId = 2;
update test.Products set ProductName = 'Widgets' where ProductId = 1;
update test.Products set ProductName = 'Widgets' where ProductId = 1;
commit tran
select p.ProductId, p.ProductName, p.EffectiveDate, p.EndingDate
from test.Products for system_time all p;
select *
from test.ProductsHistory;
答案 1 :(得分：0)
我将增加另一种可能性作为一个单独的答案，虽然我认为这不太可能 - 服务器时钟已经改变。我已经看到实例（文本日志文件多于SQL但仍然可能），时间重叠，服务器/ PC时间已经改变。这可以在夏令时开始/结束时发生（尽管在这种情况下，由于开始/结束字段是UTC，因此不太可能）。更远的可能性是您有服务器时钟漂移。我怀疑你会在服务器上看到这一点 - 我们在单核工业PC上看到它运行热和CPU经常maxxed out。即使每天同步时钟，我们也可能在一天结束时将其缩短一分钟或两分钟。
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