select * from emp where tName= '张三' and tage> 20 and tsex = '
2024-01-20判断题
select * from emp where tName= '张三' and tage> 20 and tsex = '男'; tName、tage、tsex字段上都有索引的话，都会生效。" 错
A.正确
B.错误
正确答案是B
