SQL中 SET QUOTED_IDENTIFIER OFF语句的作用

代码

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 SET QUOTED_IDENTIFIER ON
 SELECT * FROM "USER"    WHERE a='netasp'
 
 SET QUOTED_IDENTIFIER ON
 SELECT * FROM [USER] WHERE a='netasp'
 
 SET QUOTED_IDENTIFIER OFF
 SELECT * FROM [USER]    WHERE a="netasp"
 
 SET QUOTED_IDENTIFIER OFF
 SELECT * FROM [USER]    WHERE a= 'netasp'

可以做一个总结：当SET QUOTED_IDENTIFIER ON  双引号" "等同于[ ] 表示数据库对象；当SET QUOTED_IDENTIFIER OFF 双引号" "等同于单引号' '表示字符串边界；还有这里的双引号" 并不是两个单引号'合起来的，是shift+”打出来的，初学者可能会犯这样的错误。