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SQL MAX function to find Max employees


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sunnybunny

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PostPosted: Wed Oct 10, 2007 9:24 pm
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Hello friends,

I have one requirement related to SQL MAX function.

let us say there are 10 employee numbers in a table ABC. Each employee is related to one or more departments in same table ABC. Now I want to find out which employee is realted to maximum number of departments.

Please provide me the SQL query for this.

Regards,
Sunny.
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dick scherrer

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PostPosted: Wed Oct 10, 2007 11:04 pm
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Hello,

Your requirement is not the typical use of MAX. . .

MAX is typically used to retrieve the maximum value of a column.
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sunnybunny

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PostPosted: Wed Oct 10, 2007 11:28 pm
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Hello,

But I need SQL query for my requirement.
Please provide the same.

Regards,
Sunny.
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dick scherrer

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PostPosted: Thu Oct 11, 2007 12:16 am
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Hello,

Quote:
Each employee is related to one or more departments in same table ABC.
If this is an employee table and a row contains a dept for each employee, how might there be multiple departments for one employee?

It may help if you post the table definition (at least the colums needed) and your 10 sets of values for those columns.

Also post the result you want.
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stodolas

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PostPosted: Thu Oct 11, 2007 7:52 am
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Making some assumptions about your table:
Each entry in the table represents an employee/dept pair. If an employee is in more than one dept their employee number would appear more than once. If that is the case you could do this

Code:

SELECT EmployeeNumber, MAX(SUM(1)) as 'Number of Depts'
From ABC
Group By EmployeeNumber
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dick scherrer

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PostPosted: Thu Oct 11, 2007 11:37 am
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Hi Steve,

Might this be homework we are looking at?

If there are multiple employees with the same number of depts that they are "in", will all 3 be selected or only an unpredictable one of them be selected?
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stodolas

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PostPosted: Thu Oct 11, 2007 5:08 pm
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I would lean towards unpredictable. If the table is truely like this though, it is poorly designed for an operation table. It seems like the natural primary key would be emplyee number and there would be a different table that indicated department membership. Also, how many places have you been where employees belong to multiple departments?
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enrico-sorichetti

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PostPosted: Thu Oct 11, 2007 5:14 pm
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Quote:
.... Also, how many places have you been where employees belong to multiple departments?


at least this company has in the database design one row for each employee department.

I' ve seen worst companies around here,
one of them had all the department on the same row..

go figure !
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dick scherrer

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PostPosted: Thu Oct 11, 2007 6:21 pm
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Hello,

Quote:
how many places have you been where employees belong to multiple departments
Well, i've worked several places that were manufacturing companies and the mill workers might work in multiple "jobs" during a pay perioid. Different jobs paid differently and many were department specific.

When worked hours were extended to gross for payroll, the job "master" help the hourly rate (or contract rate rules) for that job.

While these folks "worked in multiple departments", they only belonged to one.

As i mentioned before - homework?
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stodolas

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PostPosted: Thu Oct 11, 2007 6:21 pm
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I was talking physically, as in does anyone in your company serve two masters?
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dick scherrer

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PostPosted: Thu Oct 11, 2007 6:33 pm
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Hello,

Yes, they serve the "master" of the department where the job is located.

If you are working on these shop floors, you are under the direction of that supervisor while you are performing that job.
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stodolas

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PostPosted: Fri Oct 12, 2007 4:45 pm
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I thought maybe one or two, thanks for the enlightenment
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vijikesavan

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PostPosted: Tue Oct 16, 2007 9:36 pm
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Looked something new and tried creating similar rows in my table, but I am getting the follow error:
Code:
DSNT408I SQLCODE = -112, ERROR:  THE OPERAND OF AN AGGREGATE FUNCTION INCLUDES
         AN AGGREGATE FUNCTION OR A SCALAR FULLSELECT                         
DSNT418I SQLSTATE   = 42607 SQLSTATE RETURN CODE                               
DSNT415I SQLERRP    = DSNXOOS1 SQL PROCEDURE DETECTING ERROR                   
DSNT416I SQLERRD    = -220 0  0  -1  0  0 SQL DIAGNOSTIC INFORMATION           
DSNT416I SQLERRD    = X'FFFFFF24'  X'00000000'  X'00000000'  X'FFFFFFFF'       
         X'00000000'  X'00000000' SQL DIAGNOSTIC INFORMATION   


Thanks,
Viji
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dick scherrer

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PostPosted: Tue Oct 16, 2007 9:42 pm
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Hello Viji,

Is your error post related to the MAX topic?

If this is part of the MAX discussion, we can leave it in this topic, it if is a new question, let us know and it can be moved to a new topic.

Please post your sql that generated the error.
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vijikesavan

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PostPosted: Tue Oct 16, 2007 10:03 pm
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Yes. it is related to this MAX topic. I want to try using the
MAX(SUM(1)) function ..here is my query

SELECT NAME, MAX(SUM(1)) as creators
from sysibm.systables
where Creator in ('OSDB2','MSCREI')
group by Name;

I was trying to retreive the table which has more than one creators.

This is just for my understanding.
Thanks,
Viji
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stodolas

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PostPosted: Tue Oct 16, 2007 10:08 pm
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Eh, my query may be wrong. But a table can't have more than one creator, can it?

The primary key on systables is CREATOR, NAME. That means one creator per table.
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dick scherrer

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PostPosted: Wed Oct 17, 2007 12:23 am
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Hello,

You might try changing this
Code:
SELECT NAME, MAX(SUM(1)) as creators
to
Code:
SELECT NAME, MAX(SUM(1)) as 'creators'
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vijikesavan

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PostPosted: Wed Oct 17, 2007 12:34 am
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When I give quotes for creators, it is giving me this error
DSNT408I SQLCODE = -104, ERROR: ILLEGAL SYMBOL "'creators'".

without any "AS" field the error remains the same.
Code:
    SELECT NAME,MAX(SUM(1))                                                     
    FROM   SYSIBM.SYSTABLES                                                     
    WHERE CREATOR IN ('OSDB2','OSMARI2')                                       
    GROUP BY NAME;                                                             

DSNT408I SQLCODE = -112, ERROR:  THE OPERAND OF AN AGGREGATE FUNCTION INCLUDES 
         AN AGGREGATE FUNCTION OR A SCALAR FULLSELECT                           


I beleive MAX and SUM function cannot be used as one.
Thanks,
Viji
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dick scherrer

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PostPosted: Wed Oct 17, 2007 12:44 am
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Hello,

Steve - the example from earlier in the post runs successfully?
Quote:
Code:
SELECT EmployeeNumber, MAX(SUM(1)) as 'Number of Depts'
From ABC
Group By EmployeeNumber
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stodolas

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PostPosted: Wed Oct 17, 2007 9:16 am
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Dick, no it doesn't. I'll fix it and post the correct query
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stodolas

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PostPosted: Wed Oct 17, 2007 9:29 am
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Correct query is this:

Code:

    SELECT NAME, SUM(1) As CreatorCount
    FROM   SYSIBM.SYSTABLES                                                     
    WHERE CREATOR IN ('OSDB2','OSMARI2')                                       
    GROUP BY NAME   
    HAVING SUM(1) > 1
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dick scherrer

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PostPosted: Wed Oct 17, 2007 7:59 pm
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Thank you, kind sir icon_smile.gif

d
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