这个DDL在SQL Server CE表上创建索引有什么问题？

With this code:

使用此代码：

command.CommandText = "CREATE TABLE InventoryItems (Id nvarchar(50) NOT NULL, PackSize smallint NOT NULL, Description nvarchar(255), DeptDotSubdept float, UnitCost float, UnitList float, UPCCode nvarchar(50), UPCPackSize smallint, CRVId int);"
command.ExecuteNonQuery();

command.CommandText = "CREATE INDEX idxUnitCost ON InventoryItems (UnitCost) ASC";
command.ExecuteNonQuery();
command.CommandText