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The BIT_COUNT SQL Function in MySQL and MariaDB - Number of bits set

BIT_COUNT	Syntax:	BIT_COUNT(Integer)
	Return value:	INTEGER
	Function type:	Numeric function

Function Description

The BIT_COUNT() function returns the number of set bits of "Integer".

Character strings as arguments are interpreted as numbers.

The BIT_COUNT() function returns NULL if the value of "Integer" is NULL.

BIT_COUNT() returns 0 if "Integer" is not a numeric value.

SQL Examples for the BIT_COUNT function


SELECT BIT_COUNT(12202);
SELECT BIT_COUNT('1234');
SELECT BIT_COUNT('xy1234');
SELECT BIT_COUNT(null)

BIT_COUNT(12202)
int(2)
9

BIT_COUNT('1234')
int(2)
5

BIT_COUNT('xy1234')
int(2)
0

BIT_COUNT(null)
int(2)
NULL

The examples were created with the MyWAY SQL manager: Download

How to use the BIT_COUNT() function in MySQL and MariaDB databases

The BIT_COUNT() function in MySQL and MariaDB can be useful in various circumstances when working with binary data or when the number of bits set in a numeric value represented in binary format needs to be counted, for example when counting the number of flags set in a bit field or when evaluating the density of "1" in a binary value.
The BIT_COUNT() function always works with the binary representation of the value. If the input is not explicitly in binary format, it is interpreted as a decimal value and converted to binary before counting the set bits.

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LOG	LOG([Base], Number)
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LOG2	LOG2(Number)
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POW	POW(Number, Exponent)
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SIN	SIN(Number)
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More information about the BIT_COUNT SQL function: mysql.com and mariadb.com and w3schools.com

Updated: 2023-09-24

2020-2024 Heino Cunze-Fischer