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What are MySQL group functions?

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2023-08-24 11:53:021082browse

MySQL 组函数是什么?

A group function is a function that is applied to a group of rows, in other words, a group function operates on a group of values. The following table gives a description of the MySQL group functions -

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Mr. No. Name and Description

AVG()Returns the average value of the parameters.

BIT_AND() Returns the bitwise AND.

BIT_ORIt returns a bitwise OR.

BIT_XOR()Returns bitwise XOR.

COUNT()It returns the number of rows returned.

COUNT(DISTINCT)Returns the count of numeric distinct values.

GROUP_CONCAT()It returns a connection string.

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MAX()It returns the maximum value.

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MIN()It returns the minimum value.

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ST()It returns the population standard deviation.

STDDEV()It returns the population standard deviation.

STDDEV_POP()It returns the population standard deviation.

STDDEV_SAMP()It returns the sample standard deviation.

SUM()It returns the sum.

VAR_POP()It returns the population standard deviation.

VAR_SAMP()It returns the sample variance.

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Variance()It returns the population standard deviation.

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