Find data from 3 tables using union but only get minimum date

Question

0.00/5 (No votes)

See more:

I have 3 tables that are similar:

Table PROBEVALIDATIONZAXIS
Columns:
timeofentry
jobnumber
zhit
machine

Table PROBEVALIDATIONHOLE
Columns:
timeofentry
jobnumber
zhit
machine

Table PROBEVALIDATIONCORNER
Columns:
timeofentry
jobnumber
zhit
machine

I want to display a distinct jobnumber for a certain machine but I also want to display a date. The problem I am having is that if I include the timeofentry in the select statement, then my select no longer displays a distinct job number because the time of entry is different in each table. How can I get it to display the min date from all 3 columns along with the job number?

If I run the query now (see below), I get the following:

11/14/2016 05:52:10 AM 28810
11/14/2016 05:52:16 AM 28810
11/14/2016 05:52:24 AM 28810
11/14/2016 06:52:10 AM 28811
11/14/2016 06:52:16 AM 28811
11/14/2016 06:52:24 AM 28811

What I want is the result with the minimum date for every job number:
11/14/2016 05:52:10 AM 28810
11/14/2016 06:52:10 AM 28811

I should also add that I originally had the union commands as minus commands, however this only works if the data is in all 3 tables. If it is just in 1 or 2 tables, then I don't get all the results

What I have tried:

SQL

Select timeofentry, JOBNUMBER
FROM PROBEVALIDATIONHOLE
WHERE HOLENUMBER = 1 AND TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
union
SELECT timeofentry, JOBNUMBER
FROM PROBEVALIDATIONZAXIS
WHERE ZHIT = 1 AND TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
union
SELECT timeofentry, JOBNUMBER
FROM PROBEVALIDATIONCORNER
WHERE TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'

Posted 14-Nov-16 4:53am

theskiguy

Updated 14-Nov-16 5:37am

Add a Solution

2 solutions

Solution 2

Have a try with an inline view like the following

SQL

select a.jobnumber, min(a.timeofentry)
from (Select timeofentry, JOBNUMBER
      FROM PROBEVALIDATIONHOLE
      WHERE HOLENUMBER = 1 AND TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
      union
      SELECT timeofentry, JOBNUMBER
      FROM PROBEVALIDATIONZAXIS
      WHERE ZHIT = 1 AND TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
      union
      SELECT timeofentry, JOBNUMBER
      FROM PROBEVALIDATIONCORNER
      WHERE TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500') a
group by a.jobnumber

Posted 14-Nov-16 5:37am

Wendelius

Comments

theskiguy 15-Nov-16 6:31am

Your solution works but it is basically the same as the first solution. Thanks for you help.

Wendelius 15-Nov-16 6:37am

Yes it seems to be the same. As you can see there's two minutes difference so we seemed to write the solution at the same time.

Glad that you got it working.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

manu_dhobale · Accepted Answer · 2016-11-14T05:34:00

Did you tried like this

select t.JOBNUMBER, MIN(t.timeofentry) from (
Select timeofentry, JOBNUMBER
FROM PROBEVALIDATIONHOLE
WHERE HOLENUMBER = 1 AND TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
union
SELECT timeofentry, JOBNUMBER
FROM PROBEVALIDATIONZAXIS
WHERE ZHIT = 1 AND TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
union
SELECT timeofentry, JOBNUMBER
FROM PROBEVALIDATIONCORNER
WHERE TIMEOFENTRY between to_date('11/13/2016','MM/DD/YYYY HH:MI:SS AM') and to_date('11/14/2016 11:59:59 PM','MM/DD/YYYY HH:MI:SS AM') and machine = 'NC-500'
)t group by t.JOBNUMBER