BOOL_AND

デスクリプション

式のすべての非NULL値に対して論理AND集約を実行します。

Alias

• BOOLAND_AGG

Syntax

BOOL_AND(<expr>)

パラメータ

Parameter	デスクリプション
<expr>	論理ANDで集約される式。BOOLEAN型および0/非0ルール（0はFALSE、非0はTRUE）によってbooleanに変換できる数値型をサポートします。

Return Value

戻り値はBOOLEANです。すべての非NULL値がTRUEの場合のみTRUEを返し、それ以外の場合はFALSEを返します。

式のすべての値がNULLまたは式が空の場合、関数はNULLを返します。

Examples

setup :

CREATE TABLE IF NOT EXISTS test_boolean_agg (
     id INT,
     c1 BOOLEAN,
     c2 BOOLEAN,
     c3 BOOLEAN,
     c4 BOOLEAN
) DISTRIBUTED BY HASH(id) BUCKETS 1
PROPERTIES ("replication_num" = "1"); 

INSERT INTO test_boolean_agg (id, c1, c2, c3, c4) values 
(1, true, true, true, false),
(2, true, false, false, false),
(3, true, true, false, false),
(4, true, false, false, false);

集約関数:

SELECT booland_agg(c1), booland_agg(c2), booland_agg(c3), booland_agg(c4)
FROM test_boolean_agg;

+-----------------+-----------------+-----------------+-----------------+
| booland_agg(c1) | booland_agg(c2) | booland_agg(c3) | booland_agg(c4) |
+-----------------+-----------------+-----------------+-----------------+
|               1 |               0 |               0 |               0 |
+-----------------+-----------------+-----------------+-----------------+

bool_andは数値型パラメータも受け付けることができ、数値が0でない場合はTRUEに変換されます

CREATE TABLE test_numeric_and_null (
    id INT,
    c_int INT,
    c_float FLOAT,
    c_decimal DECIMAL(10,2),
    c_bool BOOLEAN
) DISTRIBUTED BY HASH(id) BUCKETS 1
PROPERTIES ("replication_num" = "1");

INSERT INTO test_numeric_and_null (id, c_int, c_float, c_decimal, c_bool) VALUES
(1, 1, 1.0, NULL, NULL),
(2, 0, NULL, 0.00, NULL),
(3, 1, 3.14, 1.00, NULL),
(4, 0, 1.0, 0.00, NULL),
(5, NULL, NULL, NULL, NULL);

SELECT
    BOOL_AND(c_int) AS bool_and_int,
    BOOL_AND(c_float) AS bool_and_float,
    BOOL_AND(c_decimal) AS bool_and_decimal,
    BOOL_AND(c_bool) AS bool_and_bool
FROM test_numeric_and_null;

+--------------+----------------+------------------+---------------+
| bool_and_int | bool_and_float | bool_and_decimal | bool_and_bool |
+--------------+----------------+------------------+---------------+
|            0 |              1 |                0 |          NULL |
+--------------+----------------+------------------+---------------+

Window function:

以下の例では、条件（id > 2）に基づいて行を分割し、2つのグループに分けて、ウィンドウ集計の結果を表示します：

SELECT * FROM test_boolean_agg;

+------+------+------+------+------+
| id   | c1   | c2   | c3   | c4   |
+------+------+------+------+------+
|    1 |    1 |    1 |    1 |    0 |
|    2 |    1 |    0 |    0 |    0 |
|    3 |    1 |    1 |    0 |    0 |
|    4 |    1 |    0 |    0 |    0 |
+------+------+------+------+------+

SELECT
    id,
    BOOLAND_AGG(c1) OVER (PARTITION BY (id > 2)) AS a,
    BOOLAND_AGG(c2) OVER (PARTITION BY (id > 2)) AS b,
    BOOLAND_AGG(c3) OVER (PARTITION BY (id > 2)) AS c,
    BOOLAND_AGG(c4) OVER (PARTITION BY (id > 2)) AS d
FROM test_boolean_agg
ORDER BY id;

+------+------+------+------+------+
| id   | a    | b    | c    | d    |
+------+------+------+------+------+
|    1 |    1 |    0 |    0 |    0 |
|    2 |    1 |    0 |    0 |    0 |
|    3 |    1 |    0 |    0 |    0 |
|    4 |    1 |    0 |    0 |    0 |
+------+------+------+------+------+

エラーの例:

SELECT BOOL_AND('invalid type');

ERROR 1105 (HY000): errCode = 2, detailMessage = bool_and requires a boolean or numeric argument