MySQL8 把JSON欄位，直接轉換為多行資料1
1. t_course_put_apply表中的put_targets列為json型別。查詢出來的示例資料如下：
select put_targets from t_course_put_apply t WHERE t.id = 2022031120200011002;
查詢結果：
{
"region": ["431200"],
"school": ["2022030410000002527", "2022030410000002529", "2022030410000002530", "2022030410000002531", "2022030410000002532", "2022030410000002533", "2022030410000002534", "2022030410000002535", "2022030410000002537", "2022030410000002538"]
}
2. 通過一個sql，想把查詢結果轉換為多行資料。
SELECT
cte_put.school_id, cte_put.region_id
FROM
t_course_put_apply t,
JSON_TABLE(put_targets,
'$' COLUMNS ( nested PATH '$.school[*]' COLUMNS ( school_id varchar(32) PATH '$') ,
nested PATH '$.region[*]' COLUMNS ( region_id varchar(32) PATH '$') )) AS cte_put
WHERE
t.id = 2022031120200011002;
查詢結果：
school_id |
region_id |
2022030410000002527 |
|
2022030410000002529 |
|
2022030410000002530 |
|
2022030410000002531 |
|
2022030410000002532 |
|
2022030410000002533 |
|
2022030410000002534 |
|
2022030410000002535 |
|
2022030410000002537 |
|
2022030410000002538 |
|
431200 |