We recommend that you always explicitly define a column as null or not null for noncomputed columns or , if you use a user - defined data type , that you allow the column to use the default nullability of the data type 建议您始终将列显式定义为非计算列的null或not null ，或者，如果使用用户定义的数据类型，则建议您允许该列使用此数据类型的默认为空性。
Use adventureworks ; go - the code from this point on demonstrates that set ansi null dflt on - has an effect when the ansi null default for the database is false . - set the ansi null default database option to false by executing - alter database 为使transact - sql脚本在含有不同为空性设置的数据库中获得更可靠的操作，最好始终在create table和alter table语句中指定null或not null 。
Within a big blaze of transformative flames he dances ecstatically , exorcising the ugly demons of greedy entanglement with a threatening gesture ; transforming hatred into wisdom with his diamond thunderbolt - sceptre that symbolizes the indestructibility of awareness beyond concepts 金刚手菩萨在熊熊烈火中狂喜的舞著其凶煞狞人的外相驱除了一切邪魔外道?手持金刚杵象征著不灭的佛性能够化?恨为空性。
If a connection executes a stored procedure with different settings for these options than the connection that created the procedure , the columns of the table created for the second connection can have different nullability and exhibit different behavior 如果某个连接执行的存储过程对这些选项的设置与创建该过程的连接的设置不同，则为第二个连接创建的表列可能会有不同的为空性，并且显示出不同的行为。
However , when nullable types are used directly as web method parameters or return values , the nullability will not be reflected in the resulting wsdl in the following cases : 1 when rpc - based soap messages are used , and 2 when document - based soap messages are used with encoded parameters in the bare mode . the topic , 但是，当可为空值的类型直接用于web方法的参数或返回值时，在以下情况下将不在结果wsdl中反映出这一可为空性： 1 )在使用基于rpc的soap消息时， 2 )在将基于文档的soap消息在bare模式中用于编码参数时。
