sql 数组二
SELECT [1, 2, 3] as numbers;
SELECT ["apple", "pear", "orange"] as fruit;
SELECT [true, false, true] as booleans;
SELECT [a, b, c]
FROM
(SELECT 5 AS a,
37 AS b,
406 AS c);
SELECT [a, b, c]
FROM
(SELECT CAST(5 AS INT64) AS a,
CAST(37 AS FLOAT64) AS b,
406 AS c);
SELECT GENERATE_ARRAY(11, 33, 2) AS odds;
+--------------------------------------------------+
| odds |
+--------------------------------------------------+
| [11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33] |
+--------------------------------------------------+
访问数组元素
请参考下表 sequences:
该表包含 ARRAY 数据类型的列 some_numbers。如需访问此列中数组的元素,您必须指定要使用的索引类型:OFFSET(从 0 开始的索引)或 ORDINAL(从 1 开始的索引)。
在这里插入代码片
WITH sequences AS
(SELECT [0, 1, 1, 2, 3, 5] AS some_numbers
UNION ALL SELECT [2, 4, 8, 16, 32] AS some_numbers
UNION ALL SELECT [5, 10] AS some_numbers)
SELECT some_numbers,
some_numbers[OFFSET(1)] AS offset_1,
some_numbers[ORDINAL(1)] AS ordinal_1
FROM sequences;
+--------------------+----------+-----------+
| some_numbers | offset_1 | ordinal_1 |
+--------------------+----------+-----------+
| [0, 1, 1, 2, 3, 5] | 1 | 0 |
| [2, 4, 8, 16, 32] | 4 | 2 |
| [5, 10] | 10 | 5 |
+--------------------+----------+-----------+
查找长度
ARRAY_LENGTH() 函数用于返回数组的长度。
WITH sequences AS
(SELECT [0, 1, 1, 2, 3, 5] AS some_numbers
UNION ALL SELECT [2, 4, 8, 16, 32] AS some_numbers
UNION ALL SELECT [5, 10] AS some_numbers)
SELECT some_numbers,
ARRAY_LENGTH(some_numbers) AS len
FROM sequences;
+--------------------+--------+
| some_numbers | len |
+--------------------+--------+
| [0, 1, 1, 2, 3, 5] | 6 |
| [2, 4, 8, 16, 32] | 5 |
| [5, 10] | 2 |
+--------------------+--------+