ここで教えて頂きました。
show index で確認してみる。
mysql> show index from log_livemap_tonoff\G
*************************** 1. row ***************************
Table: log_livemap_tonoff
Non_unique: 0
Key_name: PRIMARY
Seq_in_index: 1
Column_name: ID
Collation: A
Cardinality: 9525
Sub_part: NULL
Packed: NULL
Null:
Index_type: BTREE
Comment:
Index_comment:
Visible: YES
Expression: NULL
*************************** 2. row ***************************
Table: log_livemap_tonoff
Non_unique: 1
Key_name: log_lovemap_tonoff_TM_ADD
Seq_in_index: 1
Column_name: TM_ADD
Collation: A
Cardinality: 6746
Sub_part: NULL
Packed: NULL
Null:
Index_type: BTREE
Comment:
Index_comment:
Visible: YES
Expression: NULL
*************************** 3. row ***************************
Table: log_livemap_tonoff
Non_unique: 1
Key_name: depiata
Seq_in_index: 1
Column_name: NULL
Collation: A
Cardinality: 481
Sub_part: NULL
Packed: NULL
Null: YES
Index_type: BTREE
Comment:
Index_comment:
Visible: YES
Expression: (cast(json_unquote(json_extract(`TXT_JSON`,_utf8mb4\'$.depiata\')) as char(3) charset utf8mb4) collate utf8mb4_bin)
*************************** 4. row ***************************
Table: log_livemap_tonoff
Non_unique: 1
Key_name: arviata
Seq_in_index: 1
Column_name: NULL
Collation: A
Cardinality: 449
Sub_part: NULL
Packed: NULL
Null: YES
Index_type: BTREE
Comment:
Index_comment:
Visible: YES
Expression: (cast(json_unquote(json_extract(`TXT_JSON`,_utf8mb4\'$.arviata\')) as char(3) charset utf8mb4) collate utf8mb4_bin)
*************************** 5. row ***************************
Table: log_livemap_tonoff
Non_unique: 1
Key_name: updated
Seq_in_index: 1
Column_name: NULL
Collation: A
Cardinality: 7996
Sub_part: NULL
Packed: NULL
Null: YES
Index_type: BTREE
Comment:
Index_comment:
Visible: YES
Expression: (cast(json_unquote(json_extract(`TXT_JSON`,_utf8mb4\'$.updated\')) as char(20) charset utf8mb4) collate utf8mb4_bin)
*************************** 6. row ***************************
Table: log_livemap_tonoff
Non_unique: 1
Key_name: flnum
Seq_in_index: 1
Column_name: NULL
Collation: A
Cardinality: 7996
Sub_part: NULL
Packed: NULL
Null: YES
Index_type: BTREE
Comment:
Index_comment:
Visible: YES
Expression: (cast(json_unquote(json_extract(`TXT_JSON`,_utf8mb4\'$.updated\')) as char(12) charset utf8mb4) collate utf8mb4_bin)
6 rows in set (0.00 sec)


























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