已知ds1、ds2分别代表两个不同的DataSet对象。其中ds1已包含名为“Customer”的DataTable对象,且该DataTable对象被变量dt_Customer引用。已知dt_Customer表有300条记录,则执行下列语句后,新的数据表new_dt_Customer中包含D_条记录。 DataTablenew_dt_Customer=dt_Custome
现在ataSet对象ds1,ds1中ataTable对象dt_Customer,已知dt_Customer中有1000条记录,则执行下列语句后:DataTable new_dt_Customer=dt_Customer.Copy();新的数据表new_dt_Customer中包含()条记录.A.2000B.3000C.1000D.0的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(
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What areDT_RPATHandDT_RUNPATHoptions? How can I set the options? Environment Red Hat Enterprise Linux 7 Subscriber exclusive content A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more. Current Customers and Partners ...
dt 为DataTable 类型的变量,引用名为"Customers"的DataTable 对象。该表中包含"CustomerID" 、"CustomerName" 、"Address" 、"Telephone" 等4 列。将数据列"CustomerID"设为该表的主键的正确语句有:( ) A. dt.PrimaryKey = "CustomerID"; B. "CustomerID"); C. dt.PrimaryKey = new object[]{"...
dt为DataTable类型的变量,引用名为"Customers"的Datatable对象.该表中包含 "CustomerID" "CustomerName" "Address","Telephone" 等号列.当将列"customerID"标识为dt的主键时,表自动将该列的( ) A. AllowDBNull属性设置为false,并且将Unique属性设置为true B. AllowDBNull属性设置为ture,并且将Unique属性设置为...
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