I have a MySQL table that looks like this:
+-------------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+---------+------+-----+---------+-------+
| person_id | int(11) | NO | MUL | NULL | |
| location_id | int(11) | NO | MUL | NULL | |
| date_signed | date | NO | | NULL | |
| date_ended | date | YES | | NULL | |
+-------------+---------+------+-----+---------+-------+
Where all of the records are like this:
+-----------+-------------+-------------+------------+
| person_id | location_id | date_signed | date_ended |
+-----------+-------------+-------------+------------+
| 1 | 49 | 2007-09-29 | NULL |
| 1 | 41 | 2010-10-09 | NULL |
| 2 | 45 | 2007-09-29 | NULL |
| 2 | 58 | 2007-12-16 | NULL |
| 3 | 49 | 2007-09-29 | NULL |
| 4 | 45 | 2007-09-29 | NULL |
| 4 | 35 | 2013-10-04 | NULL |
| 5 | 45 | 2007-09-29 | NULL |
| 5 | 37 | 2009-01-09 | NULL |
| 5 | 32 | 2009-10-08 | NULL |
+-----------+-------------+-------------+------------+
I'm trying to update each person's date_ended to be one day less than the date_signed in the next chronological row for that person:
+-----------+-------------+-------------+------------+
| person_id | location_id | date_signed | date_ended |
+-----------+-------------+-------------+------------+
| 1 | 49 | 2007-09-29 | 2010-10-08 |
| 1 | 41 | 2010-10-09 | NULL |
| 2 | 45 | 2007-09-29 | 2007-12-15 |
| 2 | 58 | 2007-12-16 | NULL |
.
.
.
But I can't figure out how to select the next chronological record. I tried a few suggestions from similar questions:
UPDATE a column based on the value of another column in the same table
Mysql - update table column from another column based on order
But I couldn't get them to work. Is there a way to do this in MySQL?
SQL Fiddle: http://sqlfiddle.com/#!9/8b5219/1
