以下语句的 SQL 查询

Question

输入 ID 和 Name 列值都是数组类型。

 id name
 [1,2,3,4,5] [a,b,c,d]

输出

Id Name
1 a
2 b
3 c
4 d
5 null

Answer 1

您可以使用JSON_TABLE 展开它们。

SELECT ids.Id, names.Name
FROM test t
CROSS JOIN JSON_TABLE(t.id,   '$[*]' COLUMNS(ordinal FOR ORDINALITY, Id INT PATH '$')) AS ids
LEFT JOIN  JSON_TABLE(t.name, '$[*]' COLUMNS(ordinal FOR ORDINALITY, Name TEXT PATH '$')) AS names
  ON names.ordinal = ids.ordinal;

身份证 |姓名 -: | :--- 1 |一个 2 | b 3 | C 4 | d 5 | 空

db小提琴here

Answer 2

你不能直接从数组中做这样的事情。您必须像第二张图中显示的那样将它们分成平行的部分。然后逐行插入数据。

Answer 3

PostgreSQL

数组数据类型

postgres=# create table arr(id int[],"name" char[]);
CREATE TABLE
postgres=# insert into arr values(array[1,2,3,4,5],array['a','b','c','d']);
INSERT 0 1
postgres=# select * from arr;
     id      |   name
-------------+-----------
 {1,2,3,4,5} | {a,b,c,d}
(1 row)

postgres=# select unnest(id) id ,unnest("name") "name"  from arr;
 id | name
----+------
  1 | a
  2 | b
  3 | c
  4 | d
  5 |
(5 rows)

JSON 数据类型

postgres=# create table arrj(id json, "name" json);
CREATE TABLE
postgres=# insert into arrj values(array_to_json('{1,2,3,4,5}'::int[]),array_to_json('{"a","b","c","d"}'::char[]));
INSERT 0 1
postgres=# select * from arrj;
     id      |       name
-------------+-------------------
 [1,2,3,4,5] | ["a","b","c","d"]
(1 row)

postgres=# select json_array_elements_text(id) id ,json_array_elements_text(name) "name" from arrj;
 id | name
----+------
 1  | a
 2  | b
 3  | c
 4  | d
 5  |
(5 rows)