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MySQL - MAKE_SET() Function
The MySQL MAKE_SET() function is used to retrieve string values (separated by commas) from a set of values based on the given bit(s).
This function accepts bit values separated by "|" and series of strings as parameters and returns a string where each bit value is replaced with the corresponding value from the series of strings.
Syntax
Following is the syntax of MySQL MAKE_SET() function −
MAKE_SET(bits,str1,str2,...)
Parameters
This function takes a numeric value and a list of strings as parameter.
Return Value
This function returns a comma-separated string where each bit position of the integer corresponds to inclusion or exclusion of the respective string.
Example
In the following example, we are using the MAKE_SET() function with a bit value of 3. The binary representation of 3 is '11', i.e. having both the positions as 1. Hence, it returns 'apple' and 'banana' from the series of strings 'apple', 'banana', 'mango', and 'grapes' since their position corresponds to the binary bits −
SELECT MAKE_SET(3,'apple','banana','mango', 'grapes');
Following is the output of the above code −
MAKE_SET(3,'apple','banana','mango', 'grapes') |
---|
apple,banana |
Example
Here, the first bit is 1 i.e. 001, the rightmost digit is 1 hence it returns 'apple' (first position), second bit is 4 i.e. 100, the third position is 1 (from right to left), hence it returns 'mango' −
SELECT MAKE_SET(1|4,'apple','banana','mango', 'grapes');
Output of the above code is as shown below −
MAKE_SET(1|4,'apple','banana','mango', 'grapes') |
---|
apple,mango |
Example
Even if multiple bit values are used repeatedly, the resulting string includes those values only once (no duplicates) −
SELECT MAKE_SET(3|3|3|3,'apple','banana','mango', 'grapes');
The output obtained is as follows −
MAKE_SET(3|3|3|3,'apple','banana','mango', 'grapes') |
---|
apple,banana |
Example
If you pass NULL values as bits in the series of strings, they are not included in the result (no NULL values) −
SELECT MAKE_SET(3|2,'Java', NULL, 'JavaFX','OpenCV', NULL, 'CoffeeScript', 'WebGL');
The result produced is as follows −
MAKE_SET(3|2,'Java', NULL, 'JavaFX','OpenCV', NULL, 'CoffeeScript', 'WebGL') |
---|
Java |
Example
If any of the arguments passed to this function is NULL, it returns NULL −
SELECT LOCATE(NULL, 'Tutorialspoint');
Following is the output of the above code −
LOCATE(NULL, 'Tutorialspoint') |
---|
NULL |
Example
You can also pass a series of numbers instead of strings as arguments to this function −
SELECT MAKE_SET(5, 558, 5558, 66988, 6547, 669, 368);
After executing the above code, we get the following output −
MAKE_SET(5, 558, 5558, 66988, 6547, 669, 368) |
---|
558,66988 |
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