any way to check if all the values in a column returned are the same value?

say i have a table, and in it are two columns, column1 and column2 and i do the following query:

SELECT column1, column2 FROM table WHERE column2 = '12345'

i want to check if column1 has all the same values, so in the first case, no

column1 column2
--- ---
4 12345
9 12345
5 12345

column1 column2
--- ---
9 12345
9 12345
9 12345

in the 2nd case, column1 contains all the same values, so yes

is there anyway i can check this? i would be doing this in a trigger.. say when a new row is inserted, the value of column1 is inserted, but col 2 is null.. so when they try to fill in the value for col2 of that row, the trigger checks to see if the value they put for col 2 is already in the table.. if it isn't, then everything is ok. but if it is already in teh table, then it checks col1 to see if all the values of col1 are the same

i hope this makes sense

thanksWithin your trigger, you may determine the min() and max() value of Column1 regarding a certain value for column 2:

SELECT min(Column1), max(column1)
Into Min1, Max1
FROM <YourTable>
WHERE Column2 = <Your current value>
GROUP BY Column2

If Min1=Max1, all values are the same.|||SELECT COUNT(NumValues) FROM (
SELECT COUNT(*) AS NumValues FROM MyTable
WHERE Column2 = MyValue
GROUP BY Column1) AS TempCount;