Using variable for UPDATE() the checker if the column is Updated or not

Question

Is it possible to use a variable in UPDATE() which check if a column is updated or not?

here is my sample code:

DECLARE @ColumnCount int
DECLARE @ColumnC         


        

Answer 1

A few things: You may want to handle the first time through the loop because the name would not have changed the first time through. You may want to handle when @ColumnName is null because that would mean your query did not return a row although your query below should always return a value.

DECLARE @ColumnCount INT 
DECLARE @ColumnCounter INT 
DECLARE @ColumnName NVARCHAR(max) 
DECLARE @temp varchar(max)

SET @ColumnCounter = 0 

SELECT @ColumnCount = Count(c.column_name) 
FROM   information_schema.columns c 
WHERE  c.table_name = 'Province' 

WHILE @ColumnCount >= @ColumnCounter 
  BEGIN 
      SET @ColumnName = NULL 

      SELECT @ColumnName = c.column_name 
      FROM   information_schema.columns c 
      WHERE  c.table_name = 'Province' 
             AND c.ordinal_position = @ColumnCounter 

      IF ( @ColumnName != @temp ) 
        BEGIN 
        --do something 
        END
      SET @temp = @ColumnName
      SET @ColumnCounter = @ColumnCounter + 1 
  END