mysql> CREATE TABLE jemp ( -> c JSON, -> g INT GENERATED ALWAYS AS (c->"$.id"), -> INDEX i (g) -> ); Query OK, 0 rows affected (0.28 sec) mysql> INSERT INTO jemp (c) VALUES > ('{"id": "1", "name": "Fred"}'), ('{"id": "2", "name": "Wilma"}'), > ('{"id": "3", "name": "Barney"}'), ('{"id": "4", "name": "Betty"}'); Query OK, 4 rows affected (0.04 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> SELECT c->>"$.name" AS name > FROM jemp WHERE g > 2; +--------+ | name | +--------+ | Barney | | Betty | +--------+ 2 rows in set (0.00 sec) mysql> EXPLAIN SELECT c->>"$.name" AS name > FROM jemp WHERE g > 2\G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: jemp partitions: NULL type: range possible_keys: i key: i key_len: 5 ref: NULL rows: 2 filtered: 100.00 Extra: Using where 1 row in set, 1 warning (0.00 sec)
地址:https://dev.mysql.com/doc/refman/8.0/en/create-table-secondary-indexes.html