Mar 23, 2016 · Suppose you have a table with rows containing jsonb array each and you wish to splat (or unnest) all that arrays and do some aggregate calculations on records contained in them.

Also if you want selected fields from the table and aggregate them as an array: SELECT json_agg(json_build_object('data_a',a, 'data_b',b, )) from t; The result will look like this: [{'data_a':1,'data_b':'value1'} {'data_a':2,'data_b':'value2'}]

Jul 10, 2018 · You can use jsonb_array_elements (when using jsonb) or json_array_elements (when using json) to expand the array elements. For example: WITH sample_data_array(arr) AS ( VALUES ('[{"name":"Mickey Mouse","age":10},{"name":"Donald Duck","age":5}]'::jsonb) ) , sample_data_elements(elem) AS ( SELECT jsonb_array_elements(arr) FROM sample_data_array ...

Feb 20, 2025 · SQL/JSON functions JSON_EXISTS(), JSON_QUERY(), and JSON_VALUE() described in Table 9.52 can be used to query JSON documents. Each of these functions apply a path_expression (an SQL/JSON path query) to a context_item (the document).

May 10, 2023 · To insert JSON arrays into a table in PostgreSQL, you can use the INSERT INTO statement along with the VALUES clause to specify the JSON array as a string value. Here's an example: Suppose you have a table called employees with columns id, name, and skills.

Oct 12, 2016 · I am using Postgres 9.5, and I am trying to figure out how to INSERT into a postgres table using an array of JSON. I have created a table with the following commands: The json data format looks like this: { col1: a, col2: 5, col3: 1, col4: one}, { col1: b, col2: 6, col3: 2, col4: two}, { col1: c, col2: 7, col3: 3, col4: three}

Inserting data from a JSON array with objects: INSERT INTO items (subitems) VALUES ( ARRAY( SELECT json_populate_recordset( null::subitem, '[{"type":1,"value":2},{"type":3,"value":4}]' ) ) ); The first parameter to json_populate_recordset is used as the basis for how the records are to be created.

Oct 21, 2024 · Now we can use the JSON_TABLE function to extract the details of each fruit from the JSON document. The goal is to retrieve the fruit name, color, taste, and price for each fruit in the array. Here’s the query: Running this query will give you the following result:

Oct 12, 2023 · You can pass the JSON array as a string, and let PostgreSQL parse it. INSERT INTO demo (name, car, city) SELECT name, car, city FROM json_populate_recordset (null:: demo, ' [...JSON...

Oct 22, 2022 · It turns out I can, with the help of a temporary table and jsonb_to_recordset that can turn a jsonb value into a table and row_to_json + jsonb_agg that can turn that back to jsonb. Let’s see how it works. I have a table called report with the primary key _id and jsonb column columns. It looks like this: Table 1. Table report.