Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Function to list Max value of a field in a table

Posted on 2013-05-14
2
Medium Priority
?
304 Views
Last Modified: 2013-05-14
I have a query to list fields in a database with a particular string in them:-

SELECT     sys.tables.name AS TableName, sys.columns.name AS FieldName
FROM         sys.columns INNER JOIN
                      sys.tables ON sys.columns.object_id = sys.tables.object_id
WHERE     (sys.columns.name LIKE '%Job%')
ORDER BY TableName

I use this quite a bit and in this case would like to get an idea of the data in each field so wanted to add a column to show the max value of each field so I created a function:-

CREATE FUNCTION[dbo].[FN_MaxValue](@TableName Varchar(50), @Field VarChar(50))
RETURNS Varchar(50)
AS
BEGIN
Declare @MaxVal varchar(50)
Declare @strSQL as varchar(100)
set @strSQL = 'SELECT @MaxVal = Max(' + @Field + ') FROM ' + @tablename
Exec @strSQL

RETURN @MaxVal
End


This does not work - The issue I have is passing a table name to the sql statement. I have tried a couple of options but no luck. Appreciate any ideas on getting this to work.
0
Comment
Question by:donhannam
[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
2 Comments
 
LVL 75

Accepted Solution

by:
Aneesh Retnakaran earned 2000 total points
ID: 39166598
Unfortunately dynamic sql's cant be executed directly within a SQL Server function, you should either write a CLR or a stored procedure to do this/
0
 

Author Closing Comment

by:donhannam
ID: 39166830
OK thanks - I had a look at doing a stored procedure but not sure how to return values - I decided easier to write a separate program.
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

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

This is basically a blog post I wrote recently. I've found that SARGability is poorly understood, and since many people don't read blogs, I figured I'd post it here as an article. SARGable is an adjective in SQL that means that an item can be fou…
Occasionally there is a need to clean table columns, especially if you have inherited legacy data. There are obviously many ways to accomplish that, including elaborate UPDATE queries with anywhere from one to numerous REPLACE functions (even within…
This course is ideal for IT System Administrators working with VMware vSphere and its associated products in their company infrastructure. This course teaches you how to install and maintain this virtualization technology to store data, prevent vuln…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…

670 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