How to replace just last character? - mysql

Question

Here is my table:
// table
+----+--------+
| id | number |
+----+--------+
| 1 | 123 |
| 2 | 123. |
| 3 | 12.3 |
+----+--------+
I want this:
// newtable
+----+--------+
| id | number |
+----+--------+
| 1 | 123 |
| 2 | 123 |
| 3 | 12.3 |
+----+--------+
How can I do that?
I can do that like this: (But I'm searching for faster and better approach)
// Not tested, But I think this works!
SELECT
id,
IF(RIGHT(number,1) == '.', REPLACE(number, '.', ''), number)
FROM table
// also I can use CAST(number as unsigned) instead of REPLACE(number, '.', '')
Well, is there any better solution? (without IF-statement)

Answer 1

SELECT id, CONVERT(number, DECIMAL(10,6)) FROM test

Answer 2

remove last corresponding characters if exist
SELECT id, TRIM(TRAILING '.' FROM number) FROM test

Answer 3

use this if you want to change the data in the table
mysql> CREATE TABLE test(
-> id INT(1),
-> number VARCHAR(5)
-> );
Query OK, 0 rows affected (0.02 sec)
mysql> INSERT INTO test
-> VALUES(1, '123'),
-> (2, '123.'),
-> (3, '12.3');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM test;
+------+--------+
| id | number |
+------+--------+
| 1 | 123 |
| 2 | 123. |
| 3 | 12.3 |
+------+--------+
3 rows in set (0.00 sec)
mysql> UPDATE test
-> SET number=REPLACE(number, '.', '')
-> WHERE RIGHT(number,1) = '.';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> SELECT * FROM test;
+------+--------+
| id | number |
+------+--------+
| 1 | 123 |
| 2 | 123 |
| 3 | 12.3 |
+------+--------+
3 rows in set (0.00 sec)
and use this if you want just to get the data in this form
mysql> DROP TABLE IF EXISTS test;
Query OK, 0 rows affected (0.01 sec)
mysql> CREATE TABLE test(
-> id INT(1),
-> number VARCHAR(5)
-> );
Query OK, 0 rows affected (0.02 sec)
mysql> INSERT INTO test VALUES
-> (1, '123'),
-> (2, '123.'),
-> (3, '12.3')
-> ;
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM test;
+------+--------+
| id | number |
+------+--------+
| 1 | 123 |
| 2 | 123. |
| 3 | 12.3 |
+------+--------+
3 rows in set (0.00 sec)
mysql> SELECT
-> id,
-> CASE
-> WHEN RIGHT(number,1) = '.' THEN floor(number)
-> ELSE number
-> END AS number
-> from test;
+------+--------+
| id | number |
+------+--------+
| 1 | 123 |
| 2 | 123 |
| 3 | 12.3 |
+------+--------+
3 rows in set (0.00 sec)