select maximum value row

Question

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I want to select only the newest request in the database table.
that means i want to select the maximum request ID number and related row values.

I wrote sql query as

SQL

select docName,max(appID) as appID 
from Appointment 
where patID='p00000001' 
group by docName;

An error occured as follow.
An expression of non-boolean type specified in a context where a condition is expected, near ')'.

Any one know a method to solve the problem

Posted 27-Oct-11 5:16am

madhu_

Updated 27-Oct-11 5:25am

RaisKazi

v2

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Comments

BobJanova 27-Oct-11 11:56am

That looks like it should work. MAX is a valid aggregation function. Try removing the (redundant, anyway) column alias, maybe that is confusing something.

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Bala Selvanayagam · Accepted Answer · 2011-10-27T05:59:00

Solution 1

your query looks okay but it will not result the record set of the maximum appid.

try

SQL

select *
from Appointment
where appID = (
select max(appID)
from Appointment
where patID='p00000001')

Also, hope the patID column is varchar ?

Posted 27-Oct-11 5:59am

Bala Selvanayagam

Updated 27-Oct-11 6:10am

v2

Comments

madhu_ 27-Oct-11 12:34pm

ya. u r right.
that is the answer i need. thanx

Bala Selvanayagam 28-Oct-11 3:24am

My pleasure

Amir Mahfoozi 31-Oct-11 9:10am

+5

Bala Selvanayagam 31-Oct-11 9:33am

thanks Amir