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'))) |
+----------------------------------------------------------------------------------------+
| |
+----------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
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