更多"在SQL语言中,可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]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 (14) 。
A. AGE=15AND AGE=35
B. AGE=15 OR AGE=35
C. AGE<=35 AND AGE>=15
D. AGE<35 AND AGE>15
[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]SQL语言中,删除一个表的命令是
A. DELETE
B. DROP
C. CLEAR
D. REMOVE