JSON_UNQUOTE

База данных: MySQL

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Syntax:
JSON_UNQUOTE(json_val)

Unquotes JSON value and returns the result as a utf8mb4 string. Returns
NULL if the argument is NULL. An error occurs if the value starts and
ends with double quotes but is not a valid JSON string literal.

URL: https://dev.mysql.com/doc/refman/8.0/en/json-modification-functions.html

Example

mysql> SET @j = '"abc"';
mysql> SELECT @j, JSON_UNQUOTE(@j);
+-------+------------------+
| @j | JSON_UNQUOTE(@j) |
+-------+------------------+
| "abc" | abc |
+-------+------------------+
mysql> SET @j = '[1, 2, 3]';
mysql> SELECT @j, JSON_UNQUOTE(@j);
+-----------+------------------+
| @j | JSON_UNQUOTE(@j) |
+-----------+------------------+
| [1, 2, 3] | [1, 2, 3] |
+-----------+------------------+

mysql> SELECT @@sql_mode;
+------------+
| @@sql_mode |
+------------+
| |
+------------+

mysql> SELECT JSON_UNQUOTE('"\\t\\u0032"');
+------------------------------+
| JSON_UNQUOTE('"\\t\\u0032"') |
+------------------------------+
| 2 |
+------------------------------+

mysql> SET @@sql_mode = 'NO_BACKSLASH_ESCAPES';
mysql> SELECT JSON_UNQUOTE('"\\t\\u0032"');
+------------------------------+
| JSON_UNQUOTE('"\\t\\u0032"') |
+------------------------------+
| \t\u0032 |
+------------------------------+

mysql> SELECT JSON_UNQUOTE('"\t\u0032"');
+----------------------------+
| JSON_UNQUOTE('"\t\u0032"') |
+----------------------------+
| 2 |
+----------------------------+