When using SQLite, we can use the following methods to extract data from a JSON document.
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Difference Between -> and ->> in SQLite
The -> and ->> operators were introduced in SQLite version 3.38.0, which was released on 22 February 2022. Both operators are used for extracting subcomponents of JSON. But there’s a subtle difference between them.
JSON Functions & Operators in SQLite (Full List)
Below is a full list of JSON functions and JSON operators available in SQLite.
SQLite ->> Operator
In SQLite, the ->> operator extracts a subcomponent from a JSON document and returns an SQL representation of that subcomponent.
The ->> operator was first introduced in SQLite version 3.38.0 (released on 22 February 2022).
SQLite -> Operator
In SQLite, the -> operator extracts a subcomponent from a JSON document and returns a JSON representation of that subcomponent.
The -> operator was first introduced in SQLite version 3.38.0 (released on 22 February 2022).
SQLite JSON_TREE()
In SQLite, json_tree() is a table-valued function that walks the JSON value provided as its first argument and returns a table consisting of one row for each array element or object member.
We provide the JSON value as an argument when we call the function.
SQLite JSON_EACH()
In SQLite, json_each() is a table-valued function that walks the JSON value provided as its first argument and returns a table consisting of one row for each array element or object member.
We provide the JSON value as an argument when we call the function.
SQLite JSON_TYPE()
The SQLite json_type() function returns the type of the outermost element of the given JSON.
We provide the JSON as an argument when we call the function.
We can optionally pass a path, which allows us to get the type of a specific array element or object member within the JSON.
SQLite JSON_QUOTE()
In SQLite, the json_quote() function converts a number or string into its corresponding JSON representation.
We provide the number or string as an argument when we call the function, and the function returns a JSON representation of that value.
SQLite JSON_REMOVE()
We can use the SQLite json_remove() function to remove one or more elements from a JSON object or array.
We pass the original JSON as the first argument when we call the function, followed by one or more paths that specify which elements to remove. By “elements”, I mean either array elements or object members (key/value pairs).