Using Directory Services to find if a user belongs to a group - nested scenario.

Tue, 10 Jan 2006 17:32:12 GMT

Hard to believe I spent so much time searching for this, but it took forever, so I decided to create a link to the site that eventually helped me. I use a tool that searches MSN Search and Google side-by-side and MSN is the one that finally came up with it.

http://www.irishdev.com/blogs/jbrennan/archive/2004/11/17/292.aspx

The main problem I was having is that none of the examples I found treated the nested group scenario. Where a user belongs to a group through membership in another group. The trick is to use the "tokenGroups" property to return all the SIDs for groups the user is a member of. Then compare it to the SID for the group you're interested in.

Delete duplicate SQL rows

Fri, 20 May 2005 20:09:46 GMT

The code to delete exactly duplicate rows in SQL is somewhat tricky. The fastest way is to perform a select distinct into a temporary table, and then reinsert them back. The code below is nice because it touches only the rows that are duplicated, but it will be slow if you have a lot of duplicates. Especially because deletes are costly operations.

DECLARE @switch int
SET @switch = 0

--This statement causes SQL to delete 1 row at a time.
--This leaves one of the dulpicate rows remaining.
SET rowcount 1

WHILE @switch = 0
BEGIN

    DELETE t1 FROM mytable t1
    JOIN (
        --This inner query returns duplicate rows, with the number of duplicates
        SELECT Col1,Col2,Col3, COUNT(*) AS counter
        FROM mytable
        GROUP BY Col1,Col2,Col3
        HAVING COUNT(*) > 1
        ) sub
      ON t1.Col1 = sub.Col1
      AND t1.Col2 = sub.Col2
      AND t1.Col3 = sub.Col3
    WHERE t1.Value = 0 --optional where clause to choose a particular row to delete if you have a preference

IF @@ROWCOUNT < 1 --no more duplicate rows
SELECT @switch = 1
END

SET rowcount 0 --removes the 1 row limitation.

Investing Journal: Code Snippets

Using Directory Services to find if a user belongs to a group - nested scenario.

Delete duplicate SQL rows