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a9edb3a572
MySQL supports ordering by columns which do not appear in the field list
for a SELECT DISTINCT statement while PostgreSQL does not. This results
in errors such as:
Error running :
SELECT DISTINCT pid , GROUP_CONCAT(CONCAT_WS('@@', meta_key, meta_value)) AS `extras` FROM `wp_ngg_pictures` LEFT OUTER JOIN `wp_postmeta` ON `wp_postmeta`.`post_id` = `extras_post_id` WHERE (`exclude` = 0) AND (`galleryid` IN (2)) GROUP BY wp_ngg_pictures.pid ORDER BY `sortorder` ASC
---- converted to ----
SELECT DISTINCT pid , string_agg(CONCAT_WS('@@', meta_key, meta_value), ',') AS extras FROM wp_ngg_pictures LEFT OUTER JOIN wp_postmeta ON wp_postmeta.post_id = extras_post_id WHERE (exclude = 0) AND (galleryid IN (2)) GROUP BY wp_ngg_pictures.pid ORDER BY sortorder ASC
----> ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list
LINE 1: ...yid IN (2)) GROUP BY wp_ngg_pictures.pid ORDER BY sortorder ...
^
To avoid this error, ensure that the field listed in the ORDER BY
statement also appears in the SELECT statement. To support GROUP BY
statements, ensure that it is aggregated using MIN() to mimic the MySQL
behavior.
Signed-off-by: Kevin Locke <kevin@kevinlocke.name>