Question : How do I copy column A data to column B?

Hello.
I am using MS-SQL 2005 and trying to copy Entire COlumn A to new column which is columnB.
I used this query

Update BoardTable Set ColumnA=ColumnB
and it's now working. After I did this query, both column was filled with NULL value.
Help please.
Thank you

Answer : How do I copy column A data to column B?

INSERT INTO newTable(BoardTitle, BoardName) SELECT BoardTitle, BoardName FROM BoardTable
WHERE boardID > 5 and boardid < 10

Jim