MySQL column AS with BETWEEN causes error - mysql

Question

I have an issue where I need to AS a column in a MySQL query and execute a BETWEEN on that column. The simplest version I can come up with that illustrates the problem is this:
SELECT ID AS post_id FROM wp_posts WHERE (post_id BETWEEN 10 AND 20)
This throws the following error:
#1054 - Unknown column 'post_id' in 'where clause'
Is there a way to make the newly created post_id column visible to the BETWEEN operator?
UPDATE:
This is my actual query. As you can see, it is slightly more complicated:
SELECT wp_postmeta.post_id,
MAX(CASE WHEN wp_postmeta.meta_key='store_lng' THEN wp_postmeta.meta_value END ) AS lng,
MAX(CASE WHEN wp_postmeta.meta_key='store_lat' THEN wp_postmeta.meta_value END ) AS lat
FROM wp_postmeta
LEFT JOIN wp_posts ON (wp_posts.ID=wp_postmeta.post_id)
WHERE
(lng BETWEEN 150.29793837662 AND 152.1161201948)
AND
(lat BETWEEN -34.775666623377 AND -32.957484805195)
AND
wp_posts.post_status='publish'
AND
wp_posts.post_type='store'
GROUP BY wp_postmeta.post_id

Answer 1

From the MySQL documentation:
It is not permissible to refer to a
column alias in a WHERE clause,
because the column value might not yet
be determined when the WHERE clause is
executed.
You'll either have to use ID instead of post_id in the WHERE clause or use a HAVING clause.
For example:
SELECT ID AS post_id FROM wp_posts WHERE ID BETWEEN 10 AND 20
Update: Based on your most recent update, you could use a subquery as already suggested or as I suggested earlier, you could use a HAVING clause.
For example:
SELECT wp_postmeta.post_id,
MAX(CASE WHEN wp_postmeta.meta_key = 'store_lng' THEN wp_postmeta.meta_value END) AS lng,
MAX(CASE WHEN wp_postmeta.meta_key = 'store_lat' THEN wp_postmeta.meta_value END) AS lat
FROM wp_postmeta
LEFT JOIN wp_posts
ON wp_posts.ID = wp_postmeta.post_id
WHERE wp_posts.post_status = 'publish' AND
wp_posts.post_type = 'store'
GROUP BY wp_postmeta.post_id
HAVING lng BETWEEN 150.29793837662 AND 152.1161201948 AND
lat BETWEEN -34.775666623377 AND -32.957484805195

Answer 2

Standard SQL disallows references to column aliases in a WHERE clause.
This restriction is imposed because when the WHERE clause is evaluated, the column value may not yet have been determined.
(http://dev.mysql.com/doc/refman/5.0/en/problems-with-alias.html)

Answer 3

Yes, you can!
SELECT post_id
from (select id AS post_id FROM wp_posts) x
WHERE post_id BETWEEN 10 AND 20
Edited to include changes to question. Try this (haven't run in mysql, but should be close if not correct):
SELECT *
FROM (SELECT
wp_postmeta.post_id,
MAX(CASE WHEN wp_postmeta.meta_key='store_lng' THEN wp_postmeta.meta_value END ) AS lng,
MAX(CASE WHEN wp_postmeta.meta_key='store_lat' THEN wp_postmeta.meta_value END ) AS lat
FROM wp_postmeta
GROUP BY wp_postmeta.post_id
) x
LEFT JOIN wp_posts ON wp_posts.ID = x.post_id
WHERE lng BETWEEN 150.29793837662 AND 152.1161201948
AND lat BETWEEN -34.775666623377 AND -32.957484805195
AND wp_posts.post_status='publish'
AND wp_posts.post_type='store'