A. SELECT和INTO B. SELECT和FROM C. SELECT和GROUP BY D. 仅SELECT
A. 1 B. 2 C. 3 D. 4
A. DISTINCT B. UNION C. ALL D. TOP
A. SELECT 2 * FROM test1 B. SELECT TOP 2 * FROM test1 C. SELECT PERCENT 2 * FROM test1 D. SELECT PERCENT 20 * FROM test1
A. GROUP BY B. COMPUTE BY C. HAVING D. COMPUTE
A. 如果未指定排序列,则默认按递增排序 B. 表的任何类型的列都可用作为排序依据 C. 如果在SELECT子句中指定了DISTINCT(消除重复行)关键字,那么ORDER BY子句中的列名就必须出现在SELECT子句的列表中 D. 在ORDER BY子句中使用的列不适合建立索引
A. % B. ? C. * D. _
A. =SOME B. <>SOME C. =ALL D. <>ALL
A. 3 B. 4 C. 12 D. 81