> UPDATE ngc_polling SET lastrundate =
> max(nuke_phpbb_posts.post_time)
> It returns "Invalid use of group function."

John, you're getting that error message because the
max() function requires a GROUP BY clause.  

Try this:

SELECT max(nuke_phpbb_posts.post_time)
FROM nuke_phpbb_posts
GROUP BY nuke_phpbb_posts.post_time;


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