Question

我需要显示某人签入的总天数和小时数。

下面的代码在单独的列中创建变量，除了列标题外没有标识符。我还可以创建一列来显示总小时数。

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);

输出结果为：

id fname lname days hours

但是，我希望“天”列和“小时”列成为单个列。

理想情况下，它可能显示为4 days 3 hours。这可能吗？

Answer 1

您可以使用内部查询来实现它。检查以下答案：

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

您可以使用CONCAT()函数来实现它：

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

结果将为X days Y hours

如何串联两个提取的列？

2 个答案: