In MySQL, the BIT_XOR() function returns the bitwise XOR of all bits in a given expression.
XOR is an exclusive OR, and so a XOR b is mathematically equal to (a AND (NOT b)) OR ((NOT a) and b).
aggregation
Understanding the BIT_OR() Function in MySQL
In MySQL, the BIT_OR() function returns the bitwise OR of all bits in a given expression.
Understanding the BIT_AND() Function in MySQL
In MySQL, the BIT_AND() function returns the bitwise AND of all bits in a given expression.
SQLite JSON_GROUP_OBJECT()
The SQLite json_group_object() function is an aggregate function that returns a JSON object comprised of all name/value pairs in the aggregation.
In other words, it constructs a JSON object from the values provided by its arguments.
SQLite JSON_GROUP_ARRAY()
The SQLite json_group_array() function is an aggregate function that returns a JSON array comprised of all values in the aggregation.
In other words, it constructs an array from the values provided by its argument.
How to Get Multiple Rows into a Comma Separated List in SQL
Most of the major RDBMSs have a function that enables us to return our query results as a comma separated list.
That is, we can use such a function to convert each row into a separate list item, within a comma separated list.
Below are examples of how to achieve this in some of the more popular RDBMSs.
Convert Query Results to a Comma Separated List in MariaDB
In MariaDB, we can use the GROUP_CONCAT() function to return our query results as a comma separated list. By that I mean, for a given column, we can convert all rows into a single row that contains a comma separated list of the values that made up that column. Each row is a separate item in the list.
SUM() Function in PostgreSQL
In PostgreSQL, the SUM() function computes the sum of the non-null input values and returns the result.
In other words, it adds numbers and returns the result.
AVG() Function in PostgreSQL
In PostgreSQL, the AVG() function computes the average (arithmetic mean) of all the non-null input values, and returns the result.
MAX() Function in PostgreSQL
In PostgreSQL, the MAX() function computes the maximum of the non-null input values and returns the result.
This function can be used on any numeric, string, date/time, or enum type, as well as inet, interval, money, oid, pg_lsn, tid, and arrays of any of these types.