How are JSON processing functions used in PostgreSQL?
JSON Processing Functions Returns the number of elements in the outermost JSON array. Expands the outermost JSON object into a set of key/value pairs. Expands the outermost JSON object into a set of key/value pairs.
How to concatenate two JSON objects in PostgreSQL?
The || operator concatenates two JSON objects by generating an object containing the union of their keys, taking the second object’s value when there are duplicate keys. All other cases produce a JSON array: first, any non-array input is converted into a single-element array, and then the two arrays are concatenated.
Are there comparison operators in PostgreSQL for JSON?
The standard comparison operators shown in Table 9.1 are available for jsonb, but not for json. They follow the ordering rules for B-tree operations outlined at Section 8.14.4.
How are arrays converted to objects in PostgreSQL?
Arrays and composites are converted (recursively) to arrays and objects; otherwise, if there is a cast from the type to json, the cast function will be used to perform the conversion; otherwise, a scalar value is produced.
JSON Processing Functions Returns the number of elements in the outermost JSON array. Expands the outermost JSON object into a set of key/value pairs. Expands the outermost JSON object into a set of key/value pairs. The returned values will be of type text. Returns JSON value pointed to by path_elems (equivalent to #> operator).
How to loop through JSON array of JSON objects?
How to loop through JSON array of JSON objects to see if it contains a value that I am looking for in postgres? And I have a table that essentially looks like this.
Are there any negative subscripts for JSON in PostgreSQL?
The field/element/path extraction operators that accept integer JSON array subscripts all support negative subscripting from the end of arrays. The standard comparison operators shown in Table 9.1 are available for jsonb, but not for json. They follow the ordering rules for B-tree operations outlined at Section 8.14.4.