GROUP_BITMAP_XOR
Description
Syntax:
BITMAP GROUP_BITMAP_XOR(expr)
This function performs an xor calculation on expr, and returns a new bitmap.
Example
mysql> select page, bitmap_to_string(user_id) from pv_bitmap;
+------+-----------------------------+
| page | bitmap_to_string(`user_id`) |
+------+-----------------------------+
| m | 4,7,8 |
| m | 1,3,6,15 |
| m | 4,7 |
+------+-----------------------------+
mysql> select page, bitmap_to_string(group_bitmap_xor(user_id)) from pv_bitmap group by page;
+------+-----------------------------------------------+
| page | bitmap_to_string(group_bitmap_xor(`user_id`)) |
+------+-----------------------------------------------+
| m | 1,3,6,8,15 |
+------+-----------------------------------------------+Keywords
GROUP_BITMAP_XOR,BITMAP