1. SQL Server 2016 JSON Support FOR Data Warehousing
Sifiso W. Ndlovu
@mafiswana

2. Agenda Part I: Convert JSON Data to Relational
Part II: Convert Relational Data to JSON

3. Agenda
JSON Editor

4. PART I: Convert JSON Data to Relational

5. What Is JSON
JSON (JavaScript Object Notation) is a lightweight, readable format for structuring data
It is based on a subset of JavaScript language
It is used primarily to transmit data between a server and web application, as an alternative to XML
It is easy for humans to read and write.
It is easy for machines to parse and generate

6. What Is JSON
Sample JSON document

7. Convert JSON Data to Relational
Requirement for Data Warehouse, T-SQL, Report development
JSON by itself doesn’t not make sense to business or reporting tools

8. Convert JSON Data to Relational
Available functions
ISJSON
OPENJSON
JSON_VALUE

9. Convert JSON Data to Relational
ISJSON

10. Convert JSON Data to Relational
ISJSON
Validates JSON content
Returns 1 for a valid JSON dataset and 0 for invalids
Demo

11. Convert JSON Data to Relational
OPENJSON
Works similar to OPENXML
Takes in an object and convert its data into rows and columns
Demo

12. Convert JSON Data to Relational
JSON_VALUE
Extracts a scalar value from a JSON string
Demo

13. PART II: Convert Relational Data to JSON

14. Convert Relational Data to JSON
Unsupported Data Types
Spatial
Geometry, Geography, CLR (Common Language Runtime)
Supported Data Types
SQL Server Data Type
JSON Data Type
char, nchar, varchar, nvarchar, date, datetime, datetime2, time, datetimeoffset, uniqueidentifier, money
string
int, bigint, float, decimal, numeric
number
Bit
Boolean 
varbinary, binary, image, timestamp, rowversion
BASE64-encoded string

15. Convert Relational Data to JSON
FOR JSON Clause
AUTO Mode
PATH Mode
Options FOR JSON Clause
ROOT
INCLUDE_NULL_VALUES 
WITHOUT_ARRAY_WRAPPER

16. Convert Relational Data to JSON
FOR JSON Clause
AUTO Mode
simplest way to convert relational data into a JSON
the structure of the JSON output is determined by a combination of the order of columns in your SELECT statement as well as the tables that are referenced by the SELECT statement
Demo

17. Convert Relational Data to JSON
FOR JSON Clause
PATH Mode
Without a dot syntax
With a dot syntax

18. Convert Relational Data to JSON
FOR JSON Clause
PATH Mode
Without a dot syntax
When you are using it without a dot syntax, it works similar to the AUTO mode in that it will generate a JSON output based on the ordering of columns in your SELECT statement
Demo

19. Convert Relational Data to JSON
FOR JSON Clause
PATH Mode
With a dot syntax
Used to organise the JSON output into child arrays
Demo

20. Convert Relational Data to JSON
Options FOR JSON Clause
ROOT
Used assign a label to the top-level array
Demo

21. Convert Relational Data to JSON
Options FOR JSON Clause
INCLUDE_NULL_VALUES 
Default behaviour when using FOR JSON clause is that NULL values will not be included in your JSON output
This can be overridden by specifying the INCLUDE_NULL_VALUES option
Demo

22. Convert Relational Data to JSON
Options FOR JSON Clause
WITHOUT_ARRAY_WRAPPER
Default every FOR JSON clause returns JSON data wrapped around square brackets
To override this, use WITHOUT_ARRAY_WRAPPER option
Demo

23. References www.SQLShack.com

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25. Questions