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SQL Server 2017 Developer???s Guide
book

SQL Server 2017 Developer???s Guide

by Dejan Sarka, Miloš Radivojević, William Durkin
March 2018
Intermediate to advanced content levelIntermediate to advanced
816 pages
19h 35m
English
Packt Publishing
Content preview from SQL Server 2017 Developer???s Guide

JSON_VALUE

The JSON_VALUE function extracts a scalar value from a JSON string. It accepts two input arguments:

  • Expression: This is  JSON text in the Unicode format.
  • Path: This is an optional argument; it is a JSON path expression and you can use it to specify a fragment of the input expression.

The return type of the function is nvarchar(4000), with the same collation as in the input expression. If the extracted value is longer than 4,000 characters, the function returns NULL provided the path is in lax mode, or an error message in the case of strict mode.

If either the expression or the path is not valid, the JSON_VALUE function returns an error explaining that the JSON text is not properly formatted.

The following example shows the

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Publisher Resources

ISBN: 9781788476195Supplemental Content