MySQL 删除尾随零

Question

Is there a built-in function in MySQL the removes trailing zeros on the right?

I have samples and i want my output to be like this:

 1.0    ==>   1
 1.50   ==>   1.5
10.030  ==>  10.03
 0.50   ==>   0.5
 0.0    ==>   0

Answer 1

Easiest way by far, just add zero!

Examples:

SET 
    @yournumber1="1.0", 
    @yournumber2="1.50",
    @yournumber3="10.030",
    @yournumber4="0.50",
    @yournumber5="0.0"
;

SELECT 
    (@yournumber1+0),
    (@yournumber2+0),
    (@yournumber3+0),
    (@yournumber4+0),
    (@yournumber5+0)
;

+------------------+------------------+------------------+------------------+------------------+
| (@yournumber1+0) | (@yournumber2+0) | (@yournumber3+0) | (@yournumber4+0) | (@yournumber5+0) |
+------------------+------------------+------------------+------------------+------------------+
|                1 |              1.5 |            10.03 |              0.5 |                0 |
+------------------+------------------+------------------+------------------+------------------+
1 row in set (0.00 sec)

If the column your value comes from is DECIMAL or NUMERIC type, then cast it to string first to make sure the conversion takes place...ex:

SELECT (CAST(`column_name` AS CHAR)+0) FROM `table_name`;

For a shorter way, just use any built-in string function to do the cast:

SELECT TRIM(`column_name`)+0 FROM `table_name`;

Answer 2

it solves my problem using this:

(TRIM(TRAILING '.' FROM(CAST(TRIM(TRAILING '0' FROM setpoint)AS char)))) AS setpoint

example:

mysql> SELECT testid, designationid, test, measure,
              (TRIM(TRAILING '.' FROM(CAST(TRIM(TRAILING '0' FROM setpoint)AS char)))) AS setpoint,
              (TRIM(TRAILING '.' FROM(CAST(TRIM(TRAILING '0' FROM tmin)AS char)))) AS tmin,
              (TRIM(TRAILING '.' FROM(CAST(TRIM(TRAILING '0' FROM tmax)AS char)))) AS tmax,
       FROM    tests

Answer 3

这是我的方法：

SELECT TRIM(TRAILING '.' FROM TRIM(TRAILING '0' FROM `table`.`column`)) FROM table

Answer 4

I had a similar problem in a situation where I could not modify the code nor the SQL query, but I was allowed to modify the database structure. So I changed the column format from DECIMAL to FLOAT and it solved my problem.