如何从两个不同的表中查找两列的MIN和MAX？

Question

TABLE1 contains the time of the first call made by an agent and the time of the last call made by an agent for every day GROUPED BY agent name.

AGENT      FIRSTCALL           LASTCALL
A         8/5/2013 10:59    8/5/2013 19:50
A         8/6/2013 11:06    8/6/2013 19:50
B         8/5/2013 10:33    8/5/2013 10:35
C         8/5/2013 10:04    8/5/2013 9:56
C         8/6/2013 10:02    8/6/2013 9:47
D         8/5/2013 10:37    8/5/2013 18:47
D         8/6/2013 14:58    8/6/2013 18:19
D         8/6/2013 10:01    8/6/2013 9:59
E         8/5/2013 12:29    8/5/2013 18:51
E         8/6/2013 12:05    8/6/2013 18:48
F         8/6/2013 11:15    8/6/2013 19:49
G         8/5/2013 10:04    8/5/2013 10:09
G         8/6/2013 10:39    8/6/2013 9:54

TABLE2 consists of agent name and daily login and logout time for that agent.

AGENT            LOGIN               LOGOUT
A        2013-08-05 11:02:52    2013-08-05 20:05:45
A        2013-08-06 11:00:30    2013-08-06 20:06:47
B        2013-08-05 08:59:07    2013-08-05 18:01:58
B        2013-08-06 09:11:43    2013-08-06 18:08:49
C        2013-08-05 08:58:21    2013-08-05 17:59:29
C        2013-08-06 08:59:13    2013-08-06 18:03:53
D        2013-08-05 10:37:55    2013-08-05 19:56:20
D        2013-08-06 10:37:04    2013-08-06 20:00:43
E        2013-08-06 09:20:50    2013-08-06 18:00:35
F        2013-08-05 10:58:06    2013-08-05 20:00:24
F        2013-08-06 10:49:19    2013-08-06 20:01:37
G        2013-08-06 11:00:17    2013-08-06 19:58:31
H        2013-08-05 09:00:38    2013-08-05 18:16:16
H        2013-08-06 08:56:38    2013-08-06 17:57:00

I need to join these tables in such a manner that I get AGENT, FIRSTCALL, LASTCALL, LOGIN, LOGOUT for each day. In the example above, I've only listed data for two days but the data exists for over two years (>700 days).

Previously, I've tried connecting these tables via 'AGENT' but that results in multiple records. What is the way out?

Answer 1

something like this will work. May be there'is some better way to convert timestamp to date.

select T1.AGENT, T1.FIRSTCALL, T1.LASTCALL, T2.LOGIN, T2.LOGOUT
from Table1 T1
    inner join Table2 T2 on
        T2.AGENT = T1.AGENT and
        to_char(T1.FIRSTCALL, 'YYYYMMDD') = to_char(T2.LOGIN, 'YYYYMMDD')

see sql fiddle with example

Answer 2

select T1.AGENT, T1.FIRSTCALL, T1.LASTCALL, T2.LOGIN, T2.LOGOUT
from Table1 T1
    inner join Table2 T2 on
        T2.AGENT = T1.AGENT and
        to_char(T1.FIRSTCALL, 'YYYYMMDD') = to_char(T2.LOGIN, 'YYYYMMDD')