Use IN to determine whether a given value matches any value in a specified list. The IN condition’s important characteristics are:
IN works with character strings, numbers, and datetimes.
The IN list is a parenthesized listing of one or more comma-separated values. The list items needn’t be in any particular order.
IN is a convenient, shorthand clause. You can replicate its behavior by using OR:
WHERE test_column IN (value1, value2, value3)
is equivalent to:
WHERE (test_column = value1) OR (test_column = value2) OR (test_column = value3)
String comparisons may be case-insensitive or case-sensitive, depending on your DBMS; see the DBMS Tip in “Filtering Rows with WHERE” earlier in this chapter.
You can negate an IN condition ...