The json_agg function is used to aggregate values into a JSON array in PostgreSQL database. It takes one or more values and returns a JSON array that contains those values as elements. This function is particularly useful when you want to combine rows or values into a single JSON array in the result of a…

The json_populate_recordset function is used to populate a set of composite records from an array of JSON objects. This is useful when you have an array of JSON objects, and each object corresponds to a record in a composite type. Below is the basic syntax of the json_populate_recordset function: json_populate_recordset(base_type anyelement, from_json_array json) -> SETOF…

The json_extract_path_text function is used to extract a specific value from a JSON object or array by specifying a path to the desired element. This function returns the value as text. The basic syntax of the json_extract_path_text function is as shown below: json_extract_path_text(json_object_or_array, path_element1, path_element2, …, path_elementN) Here’s an example of using the json_extract_path_text function:…

The json_populate_record function is used to populate the fields of a given composite type with data from a JSON object. This function is particularly useful when you have a JSON object that matches the structure of a composite type, and you want to extract values from the JSON and populate a composite variable. Below is…

The json_array_elements function is used to expand a JSON array into a set of rows. This function takes a JSON array as input and returns a set of rows, where each row represents an element from the input array. This is particularly useful when you want to work with individual elements of a JSON array…

In PostgreSQL, the json_each function is used to expand a JSON object into a set of key-value pairs. This function can be helpful when you want to break down a JSON object into its individual components for further analysis or manipulation. The json_each function returns a set of rows, each containing a key and its…

The json_array_length function is used to determine the number of elements in a JSON array. It’s particularly useful when you’re working with JSON data and need to find out how many items are present in an array within a JSON document. The syntax for using the json_array_length function is as follows: json_array_length(json_array) Here’s an example…

The json_object in PostgreSQL function is used to create a JSON object from a set of key-value pairs. This function was introduced in PostgreSQL 12 and provides a convenient way to create JSON objects directly within SQL queries. The basic syntax of the json_object function is as follows: json_object(key1 value1, key2 value2, …, keyN valueN)…

The json_build_object function is used to create a JSON object from key-value pairs. It allows you to construct a JSON object by specifying keys and their corresponding values. Each key-value pair you provide becomes a property in the resulting JSON object. Below is the basic syntax of using the json_build_object function: json_build_object(key1, value1, key2, value2,…

The json_build_array function in PostgreSQL is used to create a JSON array from a list of values. It takes any number of arguments and returns a JSON array containing those values. Each argument will be treated as an element of the resulting JSON array. Below is the basic syntax of using the json_build_array function: json_build_array(value1,…