oracle查询当天数据三种方式性能对比

1、select count(*) from sys_config_file where app_node ='wangjie' and to_char(create_date,'yyyy-mm-dd')=to_char(sysdate,'yyyy-mm-dd');

0.062秒

2、select count(*) from sys_config_file where app_node ='wangjie' and trunc(create_date)=trunc(sysdate);

0.093秒

3、select count(*) from sys_config_file where app_node ='wangjie' and create_date>=trunc(sysdate) and create_date<trunc(sysdate)+1;

0.015秒