bitmap_count

返回输入 bitmap 的 1 位计数。

语法

INT BITMAP_COUNT(any_bitmap)

示例

MySQL > select bitmap_count(bitmap_from_string("1,2,4"));
+-------------------------------------------+
| bitmap_count(bitmap_from_string('1,2,4')) |
+-------------------------------------------+
|                                         3 |
+-------------------------------------------+

MySQL > select bitmap_count(NULL);
+--------------------+
| bitmap_count(NULL) |
+--------------------+
|                  0 |
+--------------------+

关键词

BITMAP,BITMAP_COUNT