ClickHouse/docs/zh/sql-reference/aggregate-functions/reference/groupbitmapand.md

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sidebar_position: 129
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# groupBitmapAnd {#groupbitmapand}

计算位图列的 `AND` ，返回 `UInt64` 类型的基数，如果添加后缀 `State` ，则返回 [位图对象](../../../sql-reference/functions/bitmap-functions.md)。

**语法**

``` sql
groupBitmapAnd(expr)
```

**参数**

`expr` – 结果为 `AggregateFunction(groupBitmap, UInt*)` 类型的表达式。

**返回值**

`UInt64` 类型的值。

**示例**

``` sql
DROP TABLE IF EXISTS bitmap_column_expr_test2;
CREATE TABLE bitmap_column_expr_test2
(
    tag_id String,
    z AggregateFunction(groupBitmap, UInt32)
)
ENGINE = MergeTree
ORDER BY tag_id;

INSERT INTO bitmap_column_expr_test2 VALUES ('tag1', bitmapBuild(cast([1,2,3,4,5,6,7,8,9,10] as Array(UInt32))));
INSERT INTO bitmap_column_expr_test2 VALUES ('tag2', bitmapBuild(cast([6,7,8,9,10,11,12,13,14,15] as Array(UInt32))));
INSERT INTO bitmap_column_expr_test2 VALUES ('tag3', bitmapBuild(cast([2,4,6,8,10,12] as Array(UInt32))));

SELECT groupBitmapAnd(z) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
┌─groupBitmapAnd(z)─┐
│               3   │
└───────────────────┘

SELECT arraySort(bitmapToArray(groupBitmapAndState(z))) FROM bitmap_column_expr_test2 WHERE like(tag_id, 'tag%');
┌─arraySort(bitmapToArray(groupBitmapAndState(z)))─┐
│ [6,8,10]                                         │
└──────────────────────────────────────────────────┘
```