Solved

how to query database from this data. ( see inside )

Posted on 2014-07-22
6
368 Views
Last Modified: 2014-07-30
Hello, Expert

I got the data and schema like this

[id] --- [name] --- [timestamp] - [ type]
 1    ---    A   ---- 2012-09-01 10:00:00 --- 1
 2    ---    A   ---- 2012-09-01 10:01:00 --- 2
 3    ---    B   ---- 2012-09-01 10:01:00 --- 1
 4    ---    A   ---- 2012-09-01 10:02:00 --- 2
 5    ---    C   ---- 2012-09-01 10:01:20 --- 1
 6    ---    A   ---- 2012-09-01 10:03:00 --- 2
 7    ---    A   ---- 2012-09-01 10:03:10 --- 2
 8    ---    A   ---- 2012-09-01 10:03:00 --- 1
 9    ---    A   ---- 2012-09-01 10:03:30 --- 1
 10    ---    A   ---- 2012-09-01 10:00:20 --- 1
from above, i want to select "A" with condition
 - type 1 come first  and must follow by 2 then follow by 1 again ( with time sort )....
the result i expected is

A   ---- 2012-09-01 10:00:20 --- 1
A   ---- 2012-09-01 10:03:10 --- 2
A   ---- 2012-09-01 10:03:30 --- 1

is it possible to do this in database side. ( any database sql , nosql  , mssql , etc.. )

Thanks,
0
Comment
Question by:sora-x
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 6

Expert Comment

by:rjohnsonjr
ID: 40212289
select name,timestamp, type

from table
where
name='A'
order by timestamp,type asc
0
 
LVL 21

Expert Comment

by:Randy Poole
ID: 40212295
select [name],[timestamp], [type] from table where [name]='A' order by [timestamp]

Open in new window

0
 
LVL 8

Accepted Solution

by:
Surrano earned 500 total points
ID: 40213649
Can't really see the logic in the output:

  - type 1 come first  and must follow by 2 then follow by 1 again ( with time sort )....

I interpret it something like:
- sort type 1 entries by time
- sort type 2 entries by time
- comb the two together

but your output goes something like:
- pick oldest type 1 entry
- pick newest type 2 entry
- pick type 1 entry that is greater than prev type 2 entry

Can you please provide a sort of the full input set, or describe the sorting requirements precisely?
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:sora-x
ID: 40213976
sorry for my poor expected output it's should be

A   ---- 2012-09-01 10:00:00 --- 1
A   ---- 2012-09-01 10:01:00 --- 2
A   ---- 2012-09-01 10:03:00 --- 1
A   ---- 2012-09-01 10:03:10 --- 2
A   ---- 2012-09-01 10:03:30 --- 1

the sorting requirement is

- 1 always come before 2
- display the oldest 1
- after display 1 the next must be 2 if got many 2 in the time range display the oldest. ( type 2 timestamp greater than prev
 type 1  but less than next type 1 (if have )   )

- then display next type 1 timestamp that greater than type 2 but less than next type 2 ( if have )
- repeat ..

Thanks
0
 

Author Closing Comment

by:sora-x
ID: 40228753
This comment inspired me how to do it. Thanks
0
 
LVL 8

Expert Comment

by:Surrano
ID: 40228856
Glad I could be your muse ;)
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Why is this different from all of the other step by step guides?  Because I make a living as a DBA and not as a writer and I lived through this experience. Defining the name: When I talk to people they say different names on this subject stuff l…
Recently, Microsoft released a best-practice guide for securing Active Directory. It's a whopping 300+ pages long. Those of us tasked with securing our company’s databases and systems would, ideally, have time to devote to learning the ins and outs…
Via a live example, show how to extract insert data into a SQL Server database table using the Import/Export option and Bulk Insert.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question