从SQL中的Time_Out中减去Time_In

Question

我正在使用Oracle APEX，我希望从Att_In中减去Att_Out以获取MINUTES格式的值。我尝试了不同的查询但是给了我错误的答案或者有时候以Decimal为单位给出值。这是查询。

select (to_char(att_In,'HH24:MM:SS')) as time_In,(to_char(att_out,'HH24:MM:SS')) as time_out from attendance;

select to_char(att_In,'DD-MM-YYYY HH24:MM:SSAM'),to_char(att_out,'DD-MM-YYYY HH24:MM:SSAM'),(att_out-att_in) from attendance;

我需要Time Format

中的值