bitmap_not

bitmap_not

description

Syntax

BITMAP BITMAP_NOT(BITMAP lhs, BITMAP rhs)

计算lhs减去rhs之后的集合，返回新的bitmap.

example

mysql> select bitmap_to_string(bitmap_not(bitmap_from_string('2,3'),bitmap_from_string('1,2,3,4')));
+----------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_not(bitmap_from_string('2,3'), bitmap_from_string('1,2,3,4'))) |
+----------------------------------------------------------------------------------------+
|                                                                                        |
+----------------------------------------------------------------------------------------+

mysql> select bitmap_to_string(bitmap_not(bitmap_from_string('2,3,5'),bitmap_from_string('1,2,3,4')));
+------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_not(bitmap_from_string('2,3,5'), bitmap_from_string('1,2,3,4'))) |
+------------------------------------------------------------------------------------------+
| 5                                                                                        |
+------------------------------------------------------------------------------------------+

keywords

BITMAP_NOT,BITMAP