我目前正在尝试将所有数据从一个表复制到另一个表，因为第二个表的排序有点不同我正在使用以下 SQL 脚本来执行此操作：
USE LoanersTest
DROP TABLE LoanerItems1
CREATE TABLE LoanerItems1
(
LoanerKey INT NOT NULL UNIQUE
,BCPartNumber VARCHAR(255) NULL
,Manufacturer VARCHAR(255) NULL
,Model VARCHAR(255) NULL
,Modality INT NOT NULL UNIQUE
,Status INT NOT NULL UNIQUE
,Location INT NOT NULL UNIQUE
,ShelvingKey INT NOT NULL UNIQUE
,CalDate VARCHAR(255) NULL
,CalDue VARCHAR(255) NULL
,BCID VARCHAR(255) NULL
,SerialNumber VARCHAR(255) NULL
,AssetTag VARCHAR(255) NULL
,LoanTerm VARCHAR(255) NULL
,PartNumber VARCHAR(255) NULL
,Notes VARCHAR(255) NULL
,CriticalNotes VARCHAR(255) NULL
,ShippingNotes VARCHAR(255) NULL
,ReceivingNotes VARCHAR(255) NULL
,Description VARCHAR(255) NULL
,Details VARCHAR(255) NULL
,Attachments VARCHAR(255) NULL
,Manuals VARCHAR(255) NULL
,PRIMARY KEY (LoanerKey)
)
INSERT INTO LoanerItems1 (LoanerKey)
SELECT LoanerKey FROM LoanerItems
INSERT INTO LoanerItems1 (BCPartNumber)
SELECT BCPartNumber FROM LoanerItems
INSERT INTO LoanerItems1 (Manufacturer)
SELECT Manufacturer FROM LoanerItems
INSERT INTO LoanerItems1 (Model)
SELECT Model FROM LoanerItems
INSERT INTO LoanerItems1 (Modality)
SELECT Modality FROM LoanerItems
INSERT INTO LoanerItems1 (Status)
SELECT Status FROM LoanerItems
INSERT INTO LoanerItems1 (Location)
SELECT Location FROM LoanerItems
INSERT INTO LoanerItems1 (ShelvingKey)
SELECT ShelvingKey FROM LoanerItems
INSERT INTO LoanerItems1 (CalDate)
SELECT CalDate FROM LoanerItems
INSERT INTO LoanerItems1 (CalDue)
SELECT CalDue FROM LoanerItems
INSERT INTO LoanerItems1 (BCID)
SELECT BCID FROM LoanerItems
INSERT INTO LoanerItems1 (SerialNumber)
SELECT SerialNumber FROM LoanerItems
INSERT INTO LoanerItems1 (AssetTag)
SELECT AssetTag FROM LoanerItems
INSERT INTO LoanerItems1 (LoanTerm)
SELECT LoanTerm FROM LoanerItems
INSERT INTO LoanerItems1 (PartNumber)
SELECT PartNumber FROM LoanerItems
INSERT INTO LoanerItems1 (Notes)
SELECT Notes FROM LoanerItems
INSERT INTO LoanerItems1 (CriticalNotes)
SELECT CriticalNotes FROM LoanerItems
INSERT INTO LoanerItems1 (ShippingNotes)
SELECT ShippingNotes FROM LoanerItems
INSERT INTO LoanerItems1 (ReceivingNotes)
SELECT ReveivingNotes FROM LoanerItems
INSERT INTO LoanerItems1 (Description)
SELECT Description FROM LoanerItems
INSERT INTO LoanerItems1 (Details)
SELECT Details FROM LoanerItems
INSERT INTO LoanerItems1 (Attachments)
SELECT Attachments FROM LoanerItems
INSERT INTO LoanerItems1 (Manuals)
SELECT Manuals FROM LoanerItems
第一个表的格式完全相同（尽管列的顺序略有不同）并且包含大约 80 条记录。没有任何记录包含空值，但执行此语句会返回以下内容：
无法将值 NULL 插入到列 'Modality'、表 'LoanersTest.dbo.LoanerItems1' 中；列不允许空值。插入失败。
和
无法将值 NULL 插入到列“LoanerKey”、表“LoanersTest.dbo.LoanerItems1”中；列不允许空值。插入失败。
中的值LoanerKey基本上是 1, 2, 3, 4, 5... 85, 86, 87。modality 列暂时包含相同的值。同样，两列都不包含空值，但仍返回此错误。