How to Concatenate Two Extracted Columns?

Question

I need to display the total time Days & hours someone has checked in.

The code below creates the variables in seperate columns with no identifiers apart from the column header. I can also create a column which displays the total hours.

select id, fname, lname, othertablevariable,
extract(day from diff) Days,
extract(hour from diff) Hours
from(
select id, fname, lname, othertablevariable,
(CAST(checkout as timestamp)-CAST(checkin as timestampe)) diff
from table t1, table t2
where t1.id=t2.id);

The output comes out as:

id fname lname days hours

However, I want the days column and hours column to be a single column.

Ideally it could display as 4 days 3 hours . Is this possible?

Answer 1

You can use inner query in order to achieve it. Check the answer below:

select id, ..., Days || Hours ConcatenatedColumn
from
(
    select id, fname, lname, othertablevariable,
    extract(day from diff) Days,
    extract(hour from diff) Hours
    from(
    select id, fname, lname, othertablevariable,
    (CAST(checkout as timestamp)-CAST(checkin as timestampe)) diff
    from table t1, table t2
    where t1.id=t2.id)
)

Answer 2

You can achieve it by using CONCAT() function:

select id, fname, lname, othertablevariable,
       CONCAT(extract(day from diff), ' days ', extract(hour from diff), ' hours') AS dayshours
from (
....

The result will be X days Y hours