摘要：SQL Server T-SQL高级查询高级查询在数据库中用得是最频繁的，也是应用最广泛的。Ø 基本常用查询--selectselect * from student; --all 查询所有select all sex from student; --distinct 过滤重复select distinct sex from student; --count 统计select count(*) from student;select count(sex) from student;select count(distinct sex) from student; --top 取前N条记 阅读全文