TRUNCATE
truncate
description
Syntax
DOUBLE truncate(DOUBLE x, INT d)
Numerically truncate x according to the number of decimal places d.
The rules are as follows:
If d is literal:
When d > 0: keep d decimal places of x
When d = 0: remove the fractional part of x and keep only the integer part
When d < 0: Remove the fractional part of x, and replace the integer part with the number 0 according to the number of digits specified by d
Else if d is a column, and x has Decimal type, scale of result Decimal will always be same with input Decimal.
example
mysql> select truncate(124.3867, 2);
+-----------------------+
| truncate(124.3867, 2) |
+-----------------------+
| 124.38 |
+-----------------------+
mysql> select truncate(124.3867, 0);
+-----------------------+
| truncate(124.3867, 0) |
+-----------------------+
| 124 |
+-----------------------+
mysql> select truncate(-124.3867, -2);
+-------------------------+
| truncate(-124.3867, -2) |
+-------------------------+
| -100 |
+-------------------------+
mysql> select cast("123.123456" as Decimal(9,6)), number, truncate(cast ("123.123456" as Decimal(9,6)), number) from numbers("number"="5");
--------------
+---------------------------------------+--------+----------------------------------------------------------------------+
| cast('123.123456' as DECIMALV3(9, 6)) | number | truncate(cast('123.123456' as DECIMALV3(9, 6)), cast(number as INT)) |
+---------------------------------------+--------+----------------------------------------------------------------------+
| 123.123456 | 0 | 123.000000 |
| 123.123456 | 1 | 123.100000 |
| 123.123456 | 2 | 123.120000 |
| 123.123456 | 3 | 123.123000 |
| 123.123456 | 4 | 123.123400 |
+---------------------------------------+--------+----------------------------------------------------------------------+
keywords
TRUNCATE
