2021年7月6日 · This works because when concatenating two jsonb values, existing keys will be overwritten. The other way is to use jsonb_set() that updates a value at a location specified through a "path" (which is defined through the elements of an array) update the_table set attr = jsonb_set(attr, array['is_default'], to_jsonb(false));

2021年4月19日 · jsonb does not preserve the order of keys (keys are ordered in deterministic fashion internally), so we need not bother about the order of input rows in the aggregation. Except when there can be duplicates, then the latest copy from the input prevails.

2019年8月30日 · The structure is just (property_definition_id uuid, product_number text, value jsonb), but for multi-values, there can be multiple tuples with the same property_definition_id and product_number. Perhaps I'll play with the current EAV implementation a bit more to see if it's workable after all, but so far it's proven hard to query.

2022年10月27日 · Remember that jsonb_path_query() returns jsonb objects. If you want the contents of the object (even if it is a primitive type), extract element 0. There is no support for extracting values into anything other than json(b) or text, so you will have to then convert text to whatever numeric type you need.->>0 only works for jsonb primitives ...

2021年12月16日 · In our database, one JSONB column contains an object which has a property which is a string encoded JSON object. I need to deserialize this string during the query and inspect its values. create table datas (id int, data jsonb); insert into datas (id, data) values (1, '{"key1": "{\"foo\": \"bar\"}"}');

2024年1月17日 · jsonb does not preserve white space, does not preserve the order of object keys, and does not keep duplicate object keys. If duplicate keys are specified in the input, only the last value is kept. I have a jsonb column that contains some data. I extract specific key data (which is also json) and hash it using sha256, something like:

2022年9月17日 · When using JSONb for a complex hierarchy of references, is it better to Join by aggregating the IDs in the JSON, or have additional relations table? 0 How to build an efficient EAV model over JSONB in Postgresql

2022年9月9日 · Thanks a lot! Yes, I did look at the link but I just didn't see this function - I kept scrolling down from that point in the document where the link opened and I did not see this, because it was above : jsonb_path_query_first - This is the info I lacked.

2024年1月4日 · This is indexed with a GIN index using jsonb_path_ops and then can be queried using the @> containment operator. This works pretty nicely for checking equality, but doesn't support any other cases. The problem is that I need to also support more advanced queries here, specifically some that require support for > and < operators. Part of this is ...

2020年9月24日 · Using the jsonb_to_recordset function the json will be flattened without any problem. Now, here comes my effective question, i'm not able to address in order to solve this problem effectively... Suppose that every manufacturer has a nested JSON object that exposes the model and starting price like reported in the following JSON