Calculates the cube root of number. This function is an additional function of MaxCompute V2.0.
Syntax
double cbrt(<number>)Parameters
number: required. The value is of the BIGINT, INT, SMALLINT, TINYINT, DOUBLE, FLOAT, or STRING type.
Return value
A value of the DOUBLE type is returned. The return value varies based on the following rules:
If number is not of the BIGINT, INT, SMALLINT, TINYINT, DOUBLE, FLOAT, or STRING type, an error is returned.
If the value of number is null, null is returned.
Sample data
This section provides sample source data and examples for you to understand how to use the functions. In this topic, a table named mf_math_fun_t is created and data is inserted into the table. Sample statements:
create table if not exists mf_math_fun_t(
int_data int,
bigint_data bigint,
double_data double,
decimal_data decimal,
float_data float,
string_data string
);
insert into mf_math_fun_t values
(null, -10, 0.525, 0.525BD, cast(0.525 as float), '10'),
(-20, null, -0.1, -0.1BD, cast(-0.1 as float), '-10'),
(0, -1, null, 20.45BD, cast(-1 as float), '30'),
(-40, 4, 0.89, null, cast(0.89 as float), '-30'),
(5, -50, -1, -1BD, null, '50'),
(-60, 6, 1.5, 1.5BD, cast(1.5 as float), '-50'),
(-1, -70, -7.5, -7.5BD, cast(-7.5 as float),null ),
(-80, 1, -10.2, -10.2BD, cast(-10.2 as float), '-1' ),
(9, -90, 2.58, 2.58BD, cast(2.58 as float), '0'),
(-100, 10, -5.8, -5.8BD, cast(-5.8 as float), '-90');Query data from the mf_math_fun_t table. Sample statement:
select * from mf_math_fun_t;
-- The following result is returned:
+------------+-------------+-------------+--------------+------------+-------------+
| int_data | bigint_data | double_data | decimal_data | float_data | string_data |
+------------+-------------+-------------+--------------+------------+-------------+
| NULL | -10 | 0.525 | 0.525 | 0.525 | 10 |
| -20 | NULL | -0.1 | -0.1 | -0.1 | -10 |
| 0 | -1 | NULL | 20.45 | -1.0 | 30 |
| -40 | 4 | 0.89 | NULL | 0.89 | -30 |
| 5 | -50 | -1.0 | -1 | NULL | 50 |
| -60 | 6 | 1.5 | 1.5 | 1.5 | -50 |
| -1 | -70 | -7.5 | -7.5 | -7.5 | NULL |
| -80 | 1 | -10.2 | -10.2 | -10.2 | -1 |
| 9 | -90 | 2.58 | 2.58 | 2.58 | 0 |
| -100 | 10 | -5.8 | -5.8 | -5.8 | -90 |
+------------+-------------+-------------+--------------+------------+-------------+Example: static data
-- The return value is 2.0.
select cbrt(8);
-- The return value is null.
select cbrt(null);Example: table data
Calculate the cube root of values in columns except the decimal_data column based on the Sample data. Sample statement:
-- Enable the MaxCompute V2.0 data type edition. Commit this command along with SQL statements.
set odps.sql.type.system.odps2=true;
select cbrt(int_data) as int_new, cbrt(bigint_data) as bigint_new, cbrt(double_data) as double_new, cbrt(float_data) as float_new, cbrt(string_data) as string_new from mf_math_fun_t;The following result is returned:
+---------------------+---------------------+----------------------+---------------------+---------------------+
| int_new | bigint_new | double_new | float_new | string_new |
+---------------------+---------------------+----------------------+---------------------+---------------------+
| NULL | -2.1544346900318834 | 0.806714323012272 | 0.8067143108004823 | 2.1544346900318834 |
| -2.7144176165949063 | NULL | -0.46415888336127786 | -0.46415888566678 | -2.1544346900318834 |
| 0.0 | -1.0 | NULL | -1.0 | 3.107232505953859 |
| -3.4199518933533937 | 1.5874010519681996 | 0.9619001716077046 | 0.961900166454112 | -3.107232505953859 |
| 1.7099759466766968 | -3.6840314986403864 | -1.0 | NULL | 3.6840314986403864 |
| -3.9148676411688634 | 1.8171205928321394 | 1.1447142425533317 | 1.1447142425533317 | -3.6840314986403864 |
| -1.0 | -4.121285299808557 | -1.9574338205844317 | -1.9574338205844317 | NULL |
| -4.308869380063767 | 1.0 | -2.168702885250197 | -2.1687028717323127 | -1.0 |
| 2.080083823051904 | -4.481404746557165 | 1.3715339700741747 | 1.3715339565548288 | 0.0 |
| -4.641588833612778 | 2.1544346900318834 | -1.7967017791430528 | -1.7967017988380907 | -4.481404746557165 |
+---------------------+---------------------+----------------------+---------------------+---------------------+Related functions
CBRT is a mathematical function. For more information about functions related to data computing and conversion, see Mathematical functions.