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Chris Ward
12,129 PointsWhy I am getting this mySQL Warning?
So, I am running a query like this on my database SELECT * FROM table WHERE column LIKE '2015-10-__'; (the table or column name isn't important, so they are omitted) . The purpose of the query is to select all records from October, 2015. Of course, this is working as expected, but it is producing a warning:
mysql> SHOW WARNINGS;
+---------+------+---------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------------------------------+
| Warning | 1292 | Incorrect date value: '2015-10-__' for column at row 1 |
+---------+------+---------------------------------------------------------------------+
1 row in set (0.00 sec)
Does anyone know why I am getting this warning?
2 Answers
Chris Ward
12,129 PointsThe official explanation I got is that this is misapplying types. Dates are optimized to be compared like numbers, so you are going to take a performance hit comparing them as strings.
Luke Pettway
16,593 PointsTry using a % sign instead of the _ underscore. The underscore only allows you to match one character while the percent allows you to do more than one.