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      |
+--------------------+--------+
posted @ 2022-08-19 22:51  luoganttcc  阅读(8)  评论(0)    收藏  举报