select student_name as "姓名" ,student_gendar "性别" from student;//括号内的内容是别名,查特定列student_name和student_gendar
不等于 !=
select student_name as "姓名" ,student_gendar "性别" from student where student_gendar = '1' and student_name like '%涛%' ;// ‘%’通配符代表任意多个字符,‘_’通配符代表任意一个字符