You will break the Data Explorer with that query:
select id as [Post Link]
where body like '%if%'
or body like '%loop%'
This will end in an error:
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Because there are no full text search indexes present in the SQL Server instance SEDE is running on. The query has to do a full scan of all rows in the
Posts table. Beyond that, SEDE will never return more that 50.000 rows. SEDE is also only refreshed weekly.
If you limit the scope to a specific tag, for example progresql and gather some stats you can get some results:
when acceptedanswerid is not null
else 0 end) as [accepted]
, count(*) as [all]
from posts p
inner join posttags pt on pt.postid = p.id
inner join tags t on t.id = pt.tagid
where t.tagname = 'postgresql'
and p.body like '%explain%'
By switching the site you can run this on other databases and compare their outcome.