[英]PostgreSQL JSON array value from another column
I have employee
table in postgreSQL我在 postgreSQL 中有employee
表
CREATE TABLE Employee(EmployeeID integer PRIMARY KEY AUTO_INCREMENT,
Employeename VARCHAR(100));
alter table Employee add column parents JSON;
Now, I want to update JSON column with JSON array with a value from the existing column like below.现在,我想用 JSON 数组更新 JSON 列,并使用现有列中的值,如下所示。
update employee set parents = json_array_elements('[{"name":Employeename, "id":EmployeeID }]')
Any way I can achieve this?我有什么办法可以做到这一点?
Try using:尝试使用:
JSON_BUILD_OBJECT
function, to generate your json element JSON_BUILD_OBJECT
function,生成你的 json 元素JSON_BUILD_ARRAY
function, to enclose your json object into an array JSON_BUILD_ARRAY
function,把你的json object围成一个数组UPDATE employee
SET parents = JSON_BUILD_ARRAY(
JSON_BUILD_OBJECT('name', Employeename,
'id' , EmployeeID ));
If you need to store it as an array, since如果你需要将它存储为一个数组,因为
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