StudentGuid uniqueIdentifier not null default newid(),ĬlassGuid uniqueIdentifier null - Foreign key. Here's a sample query that uses AUTO mode with the FOR JSON clause.ĭROP TABLE IF EXISTS #tabStudent DROP TABLE IF EXISTS #tabClass ĬlassGuid uniqueIdentifier not null default newid(), You can use INCLUDE_NULL_VALUES to change this behavior. In AUTO mode, the structure of the SELECT statement determines the format of the JSON output.īy default, null values are not included in the output. Option 2 - SELECT statement controls output with FOR JSON AUTO :::image type="content" source="././relational-databases/json/media/forjson-example1.png" alt-text="Diagram of flow of FOR JSON output" lightbox="././relational-databases/json/media/forjson-example1.png"::: More info about FOR JSON PATHįor more detailed info and examples, see Format Nested JSON Output with PATH Mode (SQL Server).įor syntax and usage, see FOR Clause (Transact-SQL). The following example also uses the ROOT option to specify a named root element. Here's a sample query that uses PATH mode with the FOR JSON clause. In PATH mode, you can use the dot syntax - for example, 'Item.UnitPrice' - to format nested output. :::image type="content" source="././relational-databases/json/media/jsonslides2forjson.png" alt-text="FOR JSON" lightbox="././relational-databases/json/media/jsonslides2forjson.png"::: Option 1 - You control output with FOR JSON PATH Here's an example of a SELECT statement with the FOR JSON clause and its output.
To format the JSON output automatically based on the structure of the SELECT statement, use FOR JSON AUTO. You can create wrapper objects and nest complex properties.
TSQL JSON QUERY FULL
To maintain full control over the format of the JSON output, use FOR JSON PATH. When you use the FOR JSON clause, you can specify the structure of the JSON output explicitly, or let the structure of the SELECT statement determine the output. Īzure Data Studio is the recommended query editor for JSON queries because it auto-formats the JSON results (as seen in this article) instead of displaying a flat string. Use the FOR JSON clause to simplify client applications by delegating the formatting of JSON output from the app to. Here’s an example of referencing a key with a space in its name when using OPENJSON().=azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-currentįormat Query Results as JSON with FOR JSON (SQL Server)įormat query results as JSON, or export data from SQL Server as JSON, by adding the FOR JSON clause to a SELECT statement. Especially if those special characters are in the key names, and you need to reference those key names.įor example, you could have a key name that contains a space (like "first name"), or a dollar sign ( $).įortunately, any time you reference such keys, you can simply surround the key name with double quotes. If you’re using a T-SQL function such as OPENJSON(), JSON_QUERY(), or JSON_VALUE(), you might be wary of any non-alphanumeric characters that might be in the JSON document that you’re working with.
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