更多"在SQL语言中,用于测试列值非空的短语是【 】。"的相关试题:
[单项选择]在SQL语言中,用于测试列值非空的短语是()
A. IS NOT EMPTY
B. IS NOT NULL
C. NOT UNIQUE
D. NOT EXISTS
[单项选择]在SQL语言中,可用于测试列值非空的短语是()
A. NOT UNIQUE
B. NOT EXISTS
C. IS NOT EMPTY
D. IS NOT NULL
[单项选择]SQL语言中,级联删除的短语是
A. WHEN DELETE RESTRICT
B. ON DELETE RESTRICT
C. ON DELETE SET NULL
D. ON DELETE CASCADE
[单项选择]数据库SQL 语言 中," AGE IN(15,35 ) " 短语的正确含义是( ) 。
A. AGE = 15 AND AGE = 35
B. AGE = 15 OR AGE = 35
C. AGE < = 35 AND AGE > = 15
D. AGE < 35 AND AGE > 15
[单项选择]在SQL语言中,CREATEVIEW语句用于建立视图,如果要求对视图更新时,必须满足子查询中的表达式,应当在该语句中使用( )。
A. WITH CHECKOPTION
B. WITH INSERT
C. WITH DELETE
D. DELETE VIEW
[单项选择]在SQL语言中,CREATE VIEW语句用于建立视图。如果要求对视图更新时必须满足子查询中的条件表达式,应当在该语句中使用短语______。
A. WITHUPDATE
B. WITHINSERT
C. WITHDELETE
D. WITHCHECKOPTION
[单项选择]在SQL语言中,CREATE VIEW语句用于建立视图。如果要求对视图更新时,必须满足子查询中的条件表达式,应当在该语句中使用短语 ______。
A. WITH UPDATE
B. WITH INSERT
C. WITH DELETE
D. WITH CHECK OPTION
[单项选择]SQL语言中,删除一个表的命令是
A. DELETE
B. DROP
C. CLEAR
D. REMOVE