Convert JSON array in MySQL to rows

Question

UPDATE: This is now possible in MySQL 8 via the JSON_TABLE function: https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html

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Answer 1

Here's how to do this with JSON_TABLE in MySQL 8+:

SELECT *
     FROM
       JSON_TABLE(
         '[5, 6, 7]',
         "$[*]"
         COLUMNS(
           Value INT PATH "$"
         )
       ) data;

You can also use this as a general string split function which MySQL otherwise lacks (similar to PG's regexp_split_to_table or MSSQL's STRING_SPLIT) by taking a delimited string and turning it into a JSON string:

set @delimited = 'a,b,c';

SELECT *
     FROM
       JSON_TABLE(
         CONCAT('["', REPLACE(@delimited, ',', '", "'), '"]'),
         "$[*]"
         COLUMNS(
           Value varchar(50) PATH "$"
         )
       ) data;