SQL syntax error - Haversine formula - mysql

Question

I'm trying to get nearest places from a WordPress database using Haversine formula
My table structure below
posts
+--------------+
| Field |
+--------------+
| ID |
| post_author |
| post_title |
| post_type |
+--------------+
postmeta
+--------------+
| Field |
+--------------+
| meta_id |
| post_id |
| meta_key |
| meta_value |
+--------------+
and have records with meta_key values latitude and longitude
See the answer to my previous question for the SQL I've used to get the latitude and longitude.
SELECT p.ID,
p.post_title,
p.post_author,
max(case when pm.meta_key='latitude' then pm.meta_value end) latitude,
max(case when pm.meta_key='longitude' then pm.meta_value end) longitude
FROM `wp_posts` p
LEFT JOIN `wp_postmeta` pm
on p.ID=pm.post_id
WHERE p.post_type='place'
AND (pm.meta_key='latitude' OR pm.meta_key='longitude')
GROUP BY p.ID, p.post_title, p.post_author
ORDER BY p.ID ASC
Now I want to incorporate above query into answer for this question
SELECT item1, item2,
( 3959 * acos( cos( radians(37) )
* cos( radians( lat ) )
* cos( radians( lng )
- radians(-122) )
+ sin( radians(37) )
* sin( radians( lat ) )
)
) AS distance
FROM geocodeTable
HAVING distance < 25
ORDER BY distance LIMIT 0 , 20;
Below is by combined query
SELECT ID,
post_title,
post_author,
max(case when meta_key='latitude' then meta_value end) latitude,
max(case when meta_key='longitude' then meta_value end) longitude,
( 3959 * acos( cos( radians(18.204540500000) )
* cos( radians( latitude ) )
* cos( radians( longitude )
- radians(-66.450958500000) )
+ sin( radians(18.204540500000 )
* sin( radians( latitude ) )
)
) AS distance
FROM `wp_posts`
LEFT JOIN `wp_postmeta`
on ID=post_id
WHERE post_type='place'
AND (meta_key='latitude' OR meta_key='longitude')
GROUP BY ID, post_title, post_author
ORDER BY ID ASC
But this yields syntax error
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS distance FROM `wp_posts` LEFT JOIN `wp_postmeta` on ID=post_id WHERE po' at line 13

Answer 1

You are missing a closing ) for the first sin()
( 3959 * acos( cos( radians(18.204540500000) )
* cos( radians( latitude ) )
* cos( radians( longitude )
- radians(-66.450958500000) )
+ sin( radians(18.204540500000 ) ) /* <--- here */
* sin( radians( latitude ) )
)
) AS distance
Though it is difficult to spot visually, I found this by copying your code into a text editor that supports brace matching. It is highly recommended to use one, if not for query development and testing, then at least for debugging.

Answer 2

Try this:
SELECT *, ( 3959 * ACOS( COS( RADIANS(18.204540500000) )
* COS( RADIANS( latitude ) )
* COS( RADIANS( longitude )
- RADIANS(-66.450958500000) )
+ SIN( RADIANS(18.204540500000 ) )
* SIN( RADIANS( latitude ) )
)
) AS distance
FROM
(SELECT ID,
post_title,
post_author,
MAX(CASE WHEN meta_key='geo_latitude' THEN meta_value END) latitude,
MAX(CASE WHEN meta_key='geo_longitude' THEN meta_value END) longitude
FROM `wp_posts`
LEFT JOIN `wp_postmeta`
ON ID=post_id
WHERE post_type='place'
AND (meta_key='geo_latitude' OR meta_key='geo_longitude')
GROUP BY ID, post_title, post_author
ORDER BY ID ASC) AS A