Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 272
  • Last Modified:

t-sql query

Hi experts,

I'm using sql server 2008 R2.

I'm using the Employees table from the Northwind database

So I have 2 queries.

Query 1 is a working example.
Query 2 is the one that i'm having trouble with and need help with.



Query 1

This is the code for it:

-- Query 1
DECLARE @FromDate char(30), @ToDate char(30)
SET @FromDate = '02/01/1955'
SET @ToDate = '09/30/1955'
  
SELECT [EmployeeID]
      ,[LastName]
      ,[FirstName]
      ,[Title]
      ,[BirthDate]
FROM [Northwind].[dbo].[Employees] e
WHERE
e.[BirthDate] Between RTrim(@FromDate) And RTrim(@ToDate) 

Open in new window


When I run this query I get this:

query 1 result set
Query 2

In this query my parameter called @WhatDay holds the name of the Birthdate column of the Employees table.

This is the code I have:

-- Query 2 
DECLARE @FromDate char(30), @ToDate char(30), @WhatDay char(50)

SET @FromDate = '02/01/1955'
SET @ToDate = '09/30/1955'
SET @WhatDay = 'BirthDate'
  
SELECT [EmployeeID]
      ,[LastName]
      ,[FirstName]
      ,[Title]
      ,[BirthDate]
FROM [Northwind].[dbo].[Employees] e
WHERE
e.RTrim(@WhatDay) Between RTrim(@FromDate) And RTrim(@ToDate)     

Open in new window



In Sql Server management studio this is a screen shot of the error I'm getting:

my error message

How do I fix query 2?
0
maqskywalker
Asked:
maqskywalker
1 Solution
 
Scott PletcherSenior DBACommented:
You can't use a variable to contain a column name in SQL Server.

If you want the column name to vary, you have to build a string and then execute it dynamically, i.e., you must use dynamic SQL.
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now