OracleSQLBETWEEN不返回最后一个值

我正在使用 Oracle SQL Developer，在执行此命令后，只有名称以 开头K并L显示。为什么M不出现开头的名字？

SELECT DISTINCT(names) FROM STUDENTS WHERE names BETWEEN 'K%' AND 'M%' ORDER BY 1 DESC;

当我执行时：

SELECT DISTINCT(names) FROM STUDENTS WHERE names BETWEEN 'K%' AND 'N%' ORDER BY 1 DESC;

K, L,M出现但不以开头的名称N。BETWEEN是包容的所以有什么问题？

这完美地工作：

SELECT * FROM STUDENTS WHERE year BETWEEN 1 AND 3;

回答

-- Names with starting letters K, L, M, N
names >= 'K' AND names < 'O'

-- Names with starting letters K, L, M
REGEXP_LIKE (names, '^[K-M]')