BITMAP_AND

描述

计算两个及以上输入的 BITMAP 的交集，返回新的 BITMAP.

语法

BITMAP_AND(<bitmap>, <bitmap>,[, <bitmap>...])

参数

参数	说明
<bitmap>	被求交集的原 BITMAP 之一

返回值

返回一个 BITMAP

• 当参数存在空值时，返回 NULL

举例

select bitmap_to_string(bitmap_and(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5')));

+-----------------------------------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_and(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'))) |
+-----------------------------------------------------------------------------------------------------------------------+
| 1,2                                                                                                                   |
+-----------------------------------------------------------------------------------------------------------------------+

select bitmap_to_string(bitmap_and(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'),bitmap_empty()));

+---------------------------------------------------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_and(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'), bitmap_empty())) |
+---------------------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                                       |
+---------------------------------------------------------------------------------------------------------------------------------------+

select bitmap_to_string(bitmap_and(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'),NULL));

+-----------------------------------------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_and(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'), NULL)) |
+-----------------------------------------------------------------------------------------------------------------------------+
| NULL                                                                                                                        |
+-----------------------------------------------------------------------------------------------------------------------------+