The nullable button should not be checked.
不应选中可空按钮（nullable button）。
Table 1 spells out the rules to compute firstpos and nullable .
表1清楚地说明了计算firstpos和nullable的规则。
In C# you can flag a value type as a nullable type by adding ? after the type (like int? x;).
在C#中，你可以在一个允许为空的值类型后面加上一个问号（比如，int?x;）。
If you use a nullable VARGRAPHIC column instead, the 1021-byte index limitation is still true.
如果使用可空的vargraphic列，那么1021字节的索引限制仍然是对的。
Library Support for nullable types, including conversion operators and arithmetic operators.
为可空类型提供类库支持，包括转换运算符和算术运算符。
Value types and structures can be declared nullable.
可以将值类型和结构声明为可以为空。
The expression may be a null value if the parameter is nullable.
如果参数可为空值，则表达式可能为空值。
Only the role field - the one that had a default value of user - passed the implicit nullable constraint.
只有role字段—其默认值为user—通过隐含的nullable约束。
Unfortunately the strongly-typed DataRow classes generated by Visual Studio do not use nullable types.
不幸的是，VisualStudio生成的强类型数据集（strongly-typed DataRow）并没有使用nullable values。
Other features include class invariants, non-nullable reference types, and enhanced static analysis capabilities.
其他的特性还包括类不变量、非空引用类型和加强的静态分析功能。
The DB2Types classes also provide a means to represent DB2 database column values as individual nullable objects.
db2types类型还提供了将DB 2数据库列值表示为一个个可以为空的对象的方法。
Be sure to add a constraint that allows the new field to be both blank (in the HTML form) and nullable (in the database).
注意要添加一个约束，使这个新字段同时为blank(在HTML表单中)和nullable(在数据库中)。
Incidentally you might wonder what nullable is all about; that will become clearer when I discuss processing relative XPaths in a later column.
顺便说一句，您可能想知道nullable究竟是什么；在我于以后的专栏文章中讨论相对XPath的处理之后，您就会逐渐明白了。
For example, when you create a nullable VARCHAR (1024) column in a Unicode database and then create an index on VARCHAR (1024) column. You will encounter the following error.
例如，在Unicode数据库中创建一个可空的VARCHAR(1024)列，然后在这个VARCHAR(1024)列上创建索引。
If the remote data source cannot handle the null value in a host variable or parameter marker, any function that involves binding a nullable value has to be evaluated locally.
如果远程数据源不能处理主机变量或参数标记符中的NULL，那么任何需要绑定一个可以为空的值的函数都必须在本地计算。
If a column in the database is marked as being nullable, then the corresponding property in the data model class created by the LINQ to SQL designer will be a nullable type.
如果数据库中的一列被标志为可空，那么数据模型类相应的属性将是一个可空的类型。
If you use a nullable VARCHAR column and only ASCII characters (UTF-8 format 1 byte per character) involved, the maximum character length that can be indexed is 1021 characters.
如果使用可空的varchar列并只涉及ASCII字符(在utf - 8格式中每字符1字节)，那么可以建立索引的最大字符长度是1021个字符。
The pros include compact tables (no unnecessary nullable columns), data partitions across three subclass tables and easy association with other tables using the top super class table.
优点包括数据表比较紧凑(没有不需要的可空字段)，数据跨三个子类的表进行分区，容易使用超类的表与其他表进行关联。
Nullable types and null coalescing operator
可置空类型和空合并运算符
Specifically, any type defined as Nullable (Of t) wasn't allowed to be optional.
特别地，定义为Nullable (OfT)的任何类型都不允许是可选的。
I recently ran MoMA on SubSonic and found only one issue - a weird use of Nullable types.
最近我在SubSonic上运行了MoMA，只发现了一个问题——Nullable类型的一个奇怪应用。
I recently ran MoMA on SubSonic and found only one issue - a weird use of Nullable types.
最近我在SubSonic上运行了MoMA，只发现了一个问题——Nullable类型的一个奇怪应用。
应用推荐