MySQL Functions on Aggregation Groups

Q

Where to find reference information and tutorials on MySQL database functions on aggregation groups? I want to know how to use COUNT(), MAX() and other aggregation group related functions.

✍: FYIcenter.com

A

Here is a collection of reference information and tutorials on MySQL database functions on aggregation groups compiled by FYIcenter.com DBA team.

ANY_VALUE() - Any Value in Group

AVG() - Average Value in Group

BIT_AND() - Bitwise AND in Group

BIT_OR() - Bitwise OR in Group

BIT_XOR() - Bitwise XOR in Group

COUNT() - Counting Items in Group

GROUP_CONCAT() - Concatenating Items in Group

GROUPING() - Identifying Super-Aggregate Row

JSON_ARRAYAGG() - Building JSON Array in Group

JSON_OBJECTAGG() - Building JSON Object in Group

MAX() - Maximum Value in Group

MIN() - Minimum Value in Group

STD() - Synonym for STDDEV_POP()

STDDEV() - Synonym for STDDEV_POP()

STDDEV_POP() - Population Standard Deviation

STDDEV_SAMP() - Sample Standard Deviation

SUM() - Total Value in Group

VAR_POP() - Population Standard Variance

VAR_SAMP() - Sample Standard Variance

VARIANCE() - Synonym for VAR_POP()

Window Functions

Note that most aggregate functions are window functions. You can call them with the OVER clause to apply the function to rows inside the current window.

⇒ ANY_VALUE() - Any Value in Group

⇐ YEARWEEK() - Year Week Combination

⇑⇑ MySQL Function References

2023-11-18, 1109🔥, 0💬

IS_UUID() - Validating UUID String Format
How to validate a UUID (Universal Unique IDentifier) string using the IS_UUID() function? IS_UUID(uuid) is a MySQL built-in function that validates a UUID (Universal Unique IDentifier) string. It only checks if the given UUID is a 32-digit hexadecimal string or not. For example: SELECT IS_UUID('447f... 2023-12-08, 1549🔥, 0💬

VARIANCE() - Synonym for VAR_POP()
What's the difference between VARIANCE() and VAR_POP() functions? VARIANCE(expr) is a synonym for the VAR_POP(expr) function. Related MySQL functions: VAR_POP() - Population Standard Variance ⇒ Window Functions ⇐ VAR_SAMP() - Sample Standard Variance ⇑ MySQL Functions on Aggregation Groups ⇑⇑ My... 2023-12-01, 1355🔥, 0💬

SQRT() - Square Root of X
How to calculate the square root of a given number using the SQRT() function? SQRT(X) is a MySQL built-in function that calculates the square root of a given number. For example: SELECT SQRT(2), SQRT(4), SQRT(8); -- +--------------------+-------- -+--------------------+-- | SQRT(2) | SQRT(4) | SQRT(... 2023-11-14, 1340🔥, 0💬

UUID() - Generating UUID String
How to generate a UUID (Universal Unique IDentifier) string using the UUID() function? UUID() is a MySQL built-in function that returns a UUID (Universal Unique IDentifier) string. For example: SELECT UUID(), UUID(); -- +----------------------------- ---------+-------------------- ------------------+... 2023-12-08, 1299🔥, 0💬

VAR_SAMP() - Sample Standard Variance
How to calculate the sample standard variance of a field expression in result set groups using the VAR_SAMP() function? VAR_SAMP(expr) is a MySQL built-in aggregate function that calculates the sample standard variance of a field expression in result set groups. For example: SELECT help_category_id,... 2023-12-01, 1282🔥, 0💬

YEARWEEK() - Year Week Combination
How to calculate the year week combination from a given date using the YEARWEEK() function? YEARWEEK(date, mode) is a MySQL built-in function that calculates the year week combination from a given date. For example: SELECT YEARWEEK('2024-03-04'), WEEK('2024-03-04'); -- +------------------------+---- ... 2023-11-16, 1275🔥, 0💬

SUM() - Total Value in Group
How to calculate the total value of a field expression in result set groups using the SUM() function? SUM(expr) is a MySQL built-in aggregate function that calculates the total value of a field expression in result set groups. For example: SELECT help_category_id, SUM(help_topic_id), COUNT(help_topi... 2023-12-01, 1265🔥, 0💬

VAR_POP() - Population Standard Variance
How to calculate the population standard variance of a field expression in result set groups using the VAR_POP() function? VAR_POP(expr) is a MySQL built-in aggregate function that calculates the population standard variance of a field expression in result set groups. For example: SELECT help_catego... 2023-12-01, 1262🔥, 0💬

TRUNCATE() - Truncating to Decimal Place
How to truncate a value to a given decimal place using the TRUNCATE() function? TRUNCATE(X, D) is a MySQL built-in function that truncates X to decimal place of D. For example: SELECT TRUNCATE(-1.58, 0), TRUNCATE(23.298, 1), TRUNCATE(23.298, -1); -- +--------------------+-------- -------------+------... 2023-11-14, 1243🔥, 0💬

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