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I'm using postgres 9.6, and my question is about updating a jsonb array column.

My table looks more or less like that:

ID Name MyArray
5  John [{"key":1,"key2":a}]
6  Mike [{"key":4,"key2":b}]

ID integer,Name varchar, MyArray jsonb

I would like to update the jsonb array column with new data, without overriding the existing data.

I tried the following without success:

UPDATE myTable SET MyArray= myArray || {"key3":4} 

UPDATE myTable SET MyArray= myArray::jsonb || {"key3":4}::jsonb

Any suggestions? Thanks

  • Your method worked for me. What do you want exactly? Can you please share what output you want to see? – Yavuz Selim Oct 8 '18 at 11:13
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The || operator works since PostgreSQL 9.5 for jsonb types, as described on https://www.postgresql.org/docs/9.5/static/functions-json.html

Example:

SELECT '{"key":1, "key2": 3}'::jsonb as input,
('{"key":1, "key2": 3}'::jsonb || '{"key3":4}'::jsonb) as output;

| input              | output                      |
| ------------------ | --------------------------- |
| {"key":1,"key2":3} | {"key":1,"key2":3,"key3":4} |
  • This is not exactly what I was looking for. I'm trying to update array with new values, not to select them – Chenko Oct 8 '18 at 9:23
  • @Chenko It is trivial to extend that to an update, it was just to show you that || works but with jsonb. So your added update should work as is. – Patrick Mevzek Oct 8 '18 at 13:24

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