Query Syntax

MySQL attached
france-am_2016-07-26.sql
postmeta.sql

 SELECT wp_posts.id, group_concat(wp_postmeta.post_id) as post_id, wp_postmeta.meta_value
 FROM wp_postmeta, wp_posts
 WHERE (wp_postmeta.meta_key = '_VenueState' OR wp_postmeta.meta_key = '_VenueStateProvince') AND wp_posts.post_status = 'publish' 
GROUP BY wp_posts.id, wp_postmeta.meta_value
ORDER BY wp_postmeta.meta_value ASC

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thanks!

In standard SQL, a query that includes a GROUP BY clause cannot refer to nonaggregated columns in the select list that are not named in the GROUP BY clause.

see: https://dev.mysql.com/doc/refman/5.6/en/group-by-handling.html

As a MySQL users who has (now) experienced this error please be aware that by default MySQL is NON_STANDARD. What has happened is someone has changed the server settings from that default so that the server now requires proper/standard group by queries.

What this means is:

ALL COLUMNS of the select clause need to be repeated in the group by
EXCEPT those using SUM() COUNT() AVG() ... ...  (the aggregation functions)

select col1, col2, col3, col99, sum(abc), count(xyz), avg(gel)
from ...
group by col1, col2, col3, col99

=========================================================
what you should learn to avoid is the default MySQL group by syntax
which would allow this:

select col1, col2, col3, col99, sum(abc), count(xyz), avg(gel)
from ...
group by col1