База данных: MySQL
expr IN (value,...)
Returns 1 (true) if expr is equal to any of the values in the IN()
list, else returns 0 (false).
Type conversion takes place according to the rules described in
to all the arguments. If no type conversion is needed for the values in
the IN() list, they are all non-JSON constants of the same type, and
expr can be compared to each of them as a value of the same type
(possibly after type conversion), an optimization takes place. The
values the list are sorted and the search for expr is done using a
binary search, which makes the IN() operation very quick.
mysql> SELECT 2 IN (0,3,5,7);
mysql> SELECT 'wefwf' IN ('wee','wefwf','weg');