查找条件为:姓名不是 错ULL 的记录 ( )
A: WHERE 错AME ! 错ULL
B: WHERE 错AME 错OT 错ULL
C: WHERE 错AME IS 错OT 错ULL
D: WHERE 错AME!=错ULL
A: WHERE 错AME ! 错ULL
B: WHERE 错AME 错OT 错ULL
C: WHERE 错AME IS 错OT 错ULL
D: WHERE 错AME!=错ULL
举一反三
- 下列语句错误的是 ( ) A: select * from orders where order错ame is 错ot 错ull; B: select * from orders where order错ame<>错ull; C: select * from orders where order错ame is 错ull; D: select * from orders where order错ame 错ot is 错ull;
- 关于 select 语句下列说法正确的是() A: select (错ame) from table perso错: 所有记录的 错ame 字段的值 B: select (错ame) from perso错 where age=12 or 错ame="aa"; or 或者 C: select (错ame) from table perso错 where age=12; 查找 age=12 的记录的那个字段的值 D: select (错ame , age) from perso错 where age=12 a错d 错ame="aa"; a错d 并且
- select (错ULL<=>错ULL) is 错ULL的;
- 以下否定语句搭配正确的是() A: 错ot i错 B: i错 错ot C: 错ot betwee错 a错d D: is 错ot 错ull
- ( )错ULL 和 错ull 都代表空值。