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Accepts a JSON document and pointer expression. If the key exists and holds a JSON object (map), JSON_POINTER_EXTRACT_KEYS returns all the keys in that object as SQL ARRAY(TEXT), removing outer quotes and decoding characters. Otherwise, it returns NULL.

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Syntax

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Parameters

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Return Type

ARRAY(TEXT)
  • If any input values are NULL, the function will return NULL.

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Examples

For the JSON document used in the examples below, see JSON common example. Example The following code example extracts all the keys at path /value from the JSON document, removes the outermost quotes, and returns the result as SQL ARRAY(TEXT):

Rows: 1Execution time: 5.31ms

Example The following code example attempts to extract the keys at the path /value/no_such_key from the JSON document and returns NULL because the key does not exist:

Rows: 1Execution time: 5.38ms

Example The following code example attempts to extract the value at the path /value/keywords from the JSON document and returns NULL because the value at the specified path is an array, not an object:

Rows: 1Execution time: 5.57ms