Question

How to combine these two select statements?

Asked by: krugar77

select *
from tbl_a, tbl_b
where floor(tbl_b.engaged_time) = tbl_a.time_in_sec and tbl_b.set_id = tbl_a.run_id

select *
from tbl_a, tbl_b
where ceiling(tbl_b.engaged_time) = tbl_a.time_in_sec and tbl_b.set_id = tbl_a.run_id


Essentially what I am trying to do is take the event data that occurs at the floor and the ceiling time and generate a single recordset from that based on the engaged time to determine the floor and ceiling.

tbl_a contains event data by whole time rounded to the second
tbl_b contains the real time not rounded timestamp but does not include any event data

tbl_a example:
id, time_in_sec, x, y, z, run_id
1, 95, 45, 32, 8, set_a
2, 96, 45, 33, 8, set_a
3, 97, 46, 33, 8, set_a
4, 98, 46, 34, 7, set_a
5, 99, 47, 35, 8, set_a
6, 100, 40, 32, 8, set_a
7, 101, 41, 33, 8, set_a
8, 115, 42, 32, 9, set_a
9, 116, 43, 34, 8, set_a
10, 68, 60, 50, 7, set_b
11, 69, 61, 51, 7, set_b
12, 99, 63, 53, 7, set_b
13, 100, 64, 53, 7, set_b
14, 101, 64, 52, 7, set_b
15, 102, 65, 53, 8, set_b
16, 103, 66, 54, 7, set_b
17, 125, 62, 52, 7, set_b
18, 126, 62, 53, 8, set_b

tbl1_b example:
id, engaged_time, set_id
1, 100.123, set_a
2, 115.234, set_a
3, 95.345, set_a
4, 68.454, set_b
5, 125.657, set_b
6, 99.867, set_b

Ideal output:
100.123, 100, 40, 32, 8, 101, 41, 33, 8, set_a
115.234, 115, 42, 32, 9, 116, 43, 34, 8, set_a
95.345, 95, 45, 32, 8, 96, 45, 33, 8, set_a
68.454, 68, 60, 50, 7, 69, 61, 51, 7, set_b
125.657, 125, 62, 52, 7, 126, 62, 53, 8, set_b
99.867, 99, 63, 53, 7, 100, 64, 53, 7, set_b

Thank you in advance. If more clarification is required please let me know.

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Asked On
2008-03-14 at 07:30:08ID23241790
Tags

MySQL

,

5.0.14

Topic

MySQL Server

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: angelIIIPosted on 2008-03-14 at 07:36:42ID: 21125889

what about this:


select *
from tbl_a, tbl_b
where tbl_b.set_id = tbl_a.run_id
and ( ceiling(tbl_b.engaged_time) = tbl_a.time_in_sec
     or floor(tbl_b.engaged_time) = tbl_a.time_in_sec 
    )

                                              
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2:
3:
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Select allOpen in new window

 

by: krugar77Posted on 2008-03-14 at 07:57:21ID: 21126111

Thank you for the extremely fast suggestion angellll but that's not quite what I had hoped for.

The ideal format of the output would show both the data for the floor and ceiling of the engagement time:
100.123, 100, 40, 32, 8, 101, 41, 33, 8, set_a
115.234, 115, 42, 32, 9, 116, 43, 34, 8, set_a
95.345, 95, 45, 32, 8, 96, 45, 33, 8, set_a
68.454, 68, 60, 50, 7, 69, 61, 51, 7, set_b
125.657, 125, 62, 52, 7, 126, 62, 53, 8, set_b
99.867, 99, 63, 53, 7, 100, 64, 53, 7, set_b

Whereas your suggestion only provides one aspect of those (looking at the first three records as an example)
1, 95, 45, 32, 8, set_a, 3, 95.345, set_a
2, 96, 45, 33, 8, set_a, 3, 95.345, set_a
6, 100, 40, 32, 8, set_a, 1, 100.123, set_a

 

by: _iskywalker_Posted on 2008-03-14 at 08:12:33ID: 21126256

The output format is not about the where clause, so you should substitute the * for something like:
select tbl_b.set_id, tbl_a.set_id, tbl_a.run_id,

and so on, i dont know the columns of the table (since you didnt say) so you should pick which you want.
if you want some function processing them this is not a problem:
select floor(tbl_b.engaged_time) as engaged_time_floor, ceiling(tbl_b.engaged_time) as engaged_time_ceiling from tbl_a, tbl_b
where tbl_b.set_id = tbl_a.run_id
and ( ceiling(tbl_b.engaged_time) = tbl_a.time_in_sec
     or floor(tbl_b.engaged_time) = tbl_a.time_in_sec
    )

 

by: krugar77Posted on 2008-03-14 at 08:23:51ID: 21126374

Crap you are right. I didn't label the fields I wanted returned. Although I guess that's part of my problem. I'm not sure how to do that as it pertains to this. Just for explanations sake I'm going to label floor.x as the x data associated with the floor timestamp. The problem is I need the x data for both the floor AND ceiling in my result set not just the x data for one. Does that make more sense?

Looking at the first "ideal" record:
tbl_b.engaged_time, floor(tbl_b.engaged_time), floor.x, floor.y, floor.z, ceiling(tbl_b.engaged_time), ceiling.x, ceiling.y, ceiling.z, tbl_b.run_id
100.123, 100, 40, 32, 8, 101, 41, 33, 8, set_a

 

by: _iskywalker_Posted on 2008-03-14 at 08:30:11ID: 21126423

at 03.14.2008 at 03:57PM CET, ID: 21126111 you wrote
Whereas your suggestion only provides one aspect of those (looking at the first three records as an example)
1, 95, 45, 32, 8, set_a, 3, 95.345, set_a
2, 96, 45, 33, 8, set_a, 3, 95.345, set_a
6, 100, 40, 32, 8, set_a, 1, 100.123, set_a

the last entrty looks pretty good to me (without the column names)
you must just sort it out. or what you want? i mean the where condition tells how the set (table entries) are formed, and what angelII wrote is the correct way. The other thing is how to show the columns and that you set in the select * statement. changing it to some more specific.
as far i undertstood:
select tbl_b.engaged_time, floor(tbl_b.engaged_time), floor.x, floor.y, floor.z, ceiling(tbl_b.engaged_time), ceiling.x, ceiling.y, ceiling.z, tbl_b.run_id from tbl_a, tbl_b
where tbl_b.set_id = tbl_a.run_id
and ( ceiling(tbl_b.engaged_time) = tbl_a.time_in_sec
     or floor(tbl_b.engaged_time) = tbl_a.time_in_sec
    )
      

 

by: krugar77Posted on 2008-03-14 at 10:03:10ID: 21127227

Thank you iskywalker for your prompt feeback. Either I don't fully understand what you are saying or you are misunderstanding me.

The example provided by angellll only returns the x,y,z for one of the time stamps (either the floor OR the ceiling) per record. I require the x, y, z for both the floor AND the ceiling in a single record set (row).

An example:
For 100.123 engaged_time in tbl_b the floor is 100 and the ceiling is 101. In tbl_a 100 has an x, y, z of 40, 32, 8 and 101 has an x, y, z of 41, 33, 8.

This is not the correct result that I need:
6, 100, 40, 32, 8, set_a, 1, 100.123, set_a

This is how my requirements dictate the results be. You'll notice both sets of x, y, z values and the differing time stamps:
100.123, 100, 40, 32, 8, 101, 41, 33, 8, set_a

My problem is I don't understand how to call the x, y, z for each of those time stamps in the same query. I was only using "floor.x" as an example what I needed.

20120131-EE-VQP-002

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