右心衰竭患者毛细血管血压是升高的
A. 对
B. 错
查询姓张、姓王、姓刘老师的信息的方法是
A. SELECT *FROM TeacherWHERE Teachername like '张%' and Teachername like '王%' and Teachername like '刘%'
B. SELECT *FROM TeacherWHERE Teachername like '张%' or Teachername like '王%' and Teachername like '刘%'
C. SELECT *FROM TeacherWHERE Teachername like '张%' or Teachername like '王%' or Teachername like '刘%'
D. SELECT *FROM TeacherWHERE Teachername like '张%' and Teachername like '王%' or Teachername like '刘%'
返回组中值的平均值,使用（ ）函数
A. count
B. sum
C. avg
D. min
除count函数外，聚合函数一般忽略空值，且仅用于（）
A. 日期型列
B. 字符型列
C. 数值型列
D. 二进制列
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