Update mysql row based on same ID condition - mysql

Question

I have a MySql table (locations) that looks this:
locations
+-------+---------+--------+-------------------------------------------------------------+
| id | street | number | geoloc |
+-------+---------+--------+-------------------------------------------------------------+
| 10 | street1 | 1 | {"type": "Point", "coordinates": [-95.31231, 21.41241]} |
| 1000 | street2 | 2 | {"type": "Point", "coordinates": [9312.31231, 8231.41241]} |
| 1000 | street2 | 2 | {"type": "Point", "coordinates": [-95.45342, 21.44423]} |
| 10 | street1 | 1 | {"type": "Point", "coordinates": [312.31231, 33231.41241]} |
| 10 | street1 | 1 | {"type": "Point", "coordinates": [4312.31231, 3231.41241]} |
| 10000 | street3 | 3 | {"type": "Point", "coordinates": [-95.31271, 21.41312]} |
+-------+---------+--------+-------------------------------------------------------------+
Now the problem is that some of the location's have wrong geoloc values, and the rule to filter wrong values/good values is that some x,y coordinates are valid (ex. -95.31231, 21.41241) and some don't (ex. 4312.31231, 3231.41241). The filter pattern for good values should be this format (-95.xxxxxx, 21.xxxxxx).
The end result after update should be exactly this:
locations
+-------+---------+--------+-------------------------------------------------------------+
| id | street | number | geoloc |
+-------+---------+--------+-------------------------------------------------------------+
| 10 | street1 | 1 | {"type": "Point", "coordinates": [-95.31231, 21.41241]} |
| 1000 | street2 | 2 | {"type": "Point", "coordinates": [-95.45342, 21.44423]} |
| 1000 | street2 | 2 | {"type": "Point", "coordinates": [-95.45342, 21.44423]} |
| 10 | street1 | 1 | {"type": "Point", "coordinates": [-95.31231, 21.41241]} |
| 10 | street1 | 1 | {"type": "Point", "coordinates": [-95.31231, 21.41241]} |
| 10000 | street3 | 3 | {"type": "Point", "coordinates": [-95.31271, 21.41312]} |
+-------+---------+--------+-------------------------------------------------------------+
What I'm trying to do is this:
UPDATE locations l1, (
SELECT DISTINCT id, geoloc
FROM locations
WHERE geoloc IS NOT NULL
) l2 SET l1.geoloc = l2.geoloc
WHERE l1.id = l2.id;
And I'm not sure that WHERE is actually matching by my desired output.

Answer 1

UPDATE locations l1, (
SELECT DISTINCT id, geoloc <-- This will always return all rows
FROM locations
WHERE geoloc IS NOT NULL
) l2 SET l1.geoloc = l2.geoloc
WHERE l1.id = l2.id;
Also the update would be arbitrary.
You should try something like this.
UPDATE locations l1, locations l2
SET l1.geoloc = l2.geoloc
WHERE l1.id = l2.id
and l1. geoloc <> l2.geoloc
and ST_X(l2.geoloc) like '%-95.%';