如何在MySQL中使用不大于运算符

Question

Does mysql support !<= or !>= operator!!! I am trying to fetch the data from the Person table where the age of a person is not greater than 30 (the age field may have null value).

Answer 1

You may phrase not greater than 30 as being aged 30 or younger:

SELECT *
FROM Person
WHERE age <= 30;

By default, those records with a null age would not be included in the above inequality.

If you really wanted to use NOT , then we could try:

SELECT *
FROM Person
WHERE NOT age > 30;

But typically you will just see the appropriate inequality being used, without an explicit NOT .

Answer 2

Not greater than can be written as <=

!<= is not an operator

Answer 3

Why not doing something like this :

SELECT * FROM table WHERE id <= 100

That mean the query will selecting the ID which not GREATER THAN 100. Or if you want to search something with specific value, you can try this :

SELECT * FROM table WHERE id >= 50 AND id <= 100

That mean the query will search data from table which ID is MORE THAN 50 AND NOT GREATER THAN 100 .

Hope this will help.