ÇóGCCÁ¬½ÓsqlserverµÄ·½·¨
ÒÔǰÔÚvs05ÏÂÓÃADOÁ¬½Ó£¬ÏÖÔÚÏë»»¸ö±àÒëÆ÷ÊÔÊÔ£¬µ«²»ÖªµÀÔõô×ö¡£
ÉÏÍøÕÒÁËҲûÕÒµ½
¿ÉÒÔ˵µÄ¾ßÌåµãÂð
ÎÒ°ÑÔ´ÂëÖ±½ÓÕ³¹ýÀ´³öÒ»¶Ñ´íÎó
{{
Ïà¹ØÎÊ´ð£º
ÔÚSqlServerÖÐÈçºÎ²é¿´ÀúÊ·ÉÏÖ´ÐеĴ洢¹ý³ÌµÄÐÅÏ¢ÄØ£¬È磺´«Èë²ÎÊý£¬Ö´ÐÐʱ¼äµÈµÈ¡£Èç¹û²»Äܲ鿴ÀúÊ·¼Ç¼£¬ÊÇ·ñ¿ÉÒÔ×Ô¼ºÐ´´¥·¢Æ÷Ö®ÀàµÄ£¬È˹¤¿ØÖÆÄØ£¬ÔÚOracleÀïÃæÓж¯Ì¬ÊÓͼ¿ÉÒÔËæÊ±²é¿´ÀúÊ·Ö´ÐеÄsqlÓï¾ä£¬SqlSer ......
ÊÇÕâÑùµÄ£¬ÎÒÓÃÊÇODBCÊý¾ÝÔ´Á¬½Ó·þÎñÆ÷µÄÊý¾Ý¿â£¬ÏÖÔÚÎÒ¾õµÃºÜÂé·³£¬ÒòΪҪΪÿÈç»úÌí¼Ó¶ÔÓ¦µÄÊý¾ÝÔ´£¬Ïë°ÑËû¸Ä³ÉADO·½·¨À´·ÃÎÊ·þÎñÆ÷µÄÊý¾Ý¿âÄÜʵÏÖÂð£¿ÒªÔõôд¡£
±ÈÈç·þÎñÆ÷ÀïÓжþ¸öÊý¾Ý¿âdata1 ºÍdata2£¬¿Í»§ ......
Ҫת³ÉÒ»ÑùµÄЧ¹û£¬ÓÃpowerdesignerÔõôת£¿ÄÜתÂð£¿
create table publishers (
publisherID int identity,
publisherName varchar (30) NOT NULL,
constraint pk_publishers primary key (publisherID)
)& ......
´ÓÍøÉϲ鵽µÄ×ÊÁÏ˵£¬ÈκÎÊý¾ÝÀàÐÍÓëNULLÖµ½øÐмÆË㣬½á¹û¶¼½«ÎªNULL.
select null-1
½á¹ûÊÇnull
¿ÉÊÇÏÂÃæÕâ¸ö²éѯΪʲô»á³ö´íÄØ£¿
select isnull(null-1,'test');
¾ÓÈ»±¨´í˵½«varcharתΪintʧ°Ü¡£
Ϊʲô» ......