1.2 KiB
1.2 KiB
title, language
| title | language |
|---|---|
| bitmap_and | zh-CN |
bitmap_and
description
Syntax
BITMAP BITMAP_AND(BITMAP lhs, BITMAP rhs)
计算两个输入bitmap的交集，返回新的bitmap.
example
mysql> select bitmap_count(bitmap_and(to_bitmap(1), to_bitmap(2))) cnt;
+------+
| cnt |
+------+
| 0 |
+------+
mysql> select bitmap_count(bitmap_and(to_bitmap(1), to_bitmap(1))) cnt;
+------+
| cnt |
+------+
| 1 |
+------+
keyword
BITMAP_AND,BITMAP