How to diagnose and fix the 22038 singleton_sql_json_item_required error code in Postgres.
The 22038 error code in PostgreSQL, which stands for singleton_sql_json_item_required, indicates that a single JSON item was required but the JSON value contained multiple items or was not a singleton. This error typically occurs in the context of SQL/JSON functions and operators that expect a single JSON item as input. Here are some examples and …