Let’s also say that bad query is taking part in a modification.
SET u2.Reputation *= 2
FROM Users AS u
JOIN dbo.Users AS u2
ON CHARINDEX(u.DisplayName, u2.DisplayName) > 0
WHERE u2.Reputation >= 100000;
AND u.Id <> u2.Id;
This query will run for so long that we’ll get sick of waiting for it. It’s really holding up writing this blog post.
Erik rewrites this query a couple of times. Click through to learn what he does and why he does it.