Su, Xiaomeng 76a5b1ee83 dli_sqlreference_20240227

Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Su, Xiaomeng <suxiaomeng1@huawei.com>
Co-committed-by: Su, Xiaomeng <suxiaomeng1@huawei.com>

2024-03-27 22:02:33 +00:00

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Table 1 lists the aggregate functions supported by DLI.

**Table 1** Aggregate functions
Syntax	Value Type	Description
avg(col), avg(DISTINCT col)	DOUBLE	Returns the average value.
corr(col1, col2)	DOUBLE	Returns the coefficient of correlation of a pair of numeric columns.
count([distinct\|all] <colname>)	BIGINT	Returns the number of records.
covar_pop(col1, col2)	DOUBLE	Returns the covariance of a pair of numeric columns.
covar_samp(col1, col2)	DOUBLE	Returns the sample covariance of a pair of numeric columns.
max(col)	DOUBLE	Returns the maximum value.
min(col)	DOUBLE	Returns the minimum value.
percentile(BIGINT col, p)	DOUBLE	Returns the percentage value point of the value area. The value of p must be between 0 and 1. Otherwise, NULL is returned. The value cannot be a float.
percentile_approx(DOUBLE col, p [, B])	DOUBLE	Returns the approximate pth percentile of a numerical column within the group, including floating-point numbers. The value of p should be between 0 and 1. The parameter B controls the accuracy of the approximation, with a higher value of B resulting in a higher level of approximation. The default value is 10000. If the number of non-repeating values in the column is less than B, an exact percentile is returned.
stddev_pop(col)	DOUBLE	Returns the deviation of a specified column.
stddev_samp(col)	DOUBLE	Returns the sample deviation of a specified column.
sum(col), sum(DISTINCT col)	DOUBLE	Returns the sum of the values in a column.
variance(col), var_pop(col)	DOUBLE	Returns the variance of a column.
var_samp(col)	DOUBLE	Returns the sample variance of a specified column.

Parent topic: Aggregate Functions

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