A、 WHERE
B、 GROUP BY
C、ORDER BY
D、 UNION
答案:A
A、 WHERE
B、 GROUP BY
C、ORDER BY
D、 UNION
答案:A
A. ASC
B. DROP
C. ASCEND
D. DESC
A. <>ANY
B. =ANY
C. =ALL
D. <>ALL
A. 局部变量
B. 类变量
C. 方法参数
D. 异常处理参数
A. EXISTS
B. DISTINCT
C. NOT EXISTS
D. COUNT
A. 正确
B. 错误
A. MONTH
B. USER
C. DATABASE
D. VERSION
A. SELECT
B. ORDER BY
C. GROUP BY
D. HAVING
A. SELECT城市,面积,人口FROM 地区ORDER BY面积,人口:
B. SELECT城市,面积 AS r,人口 AS s FROM地区 ORDER BY r,s;
C. SELECT 城市, 面积,人口 FROM 地区ORDER BY 2.3;
D. SELECT 城市,面积 AS r,人口 FROM 地区 ORDER BY 2,3;