MySQLはSybaseASEコマンドと同等ですか？

sybaseASEコマンドに相当するMySQLはEXPLAINキーワードです。まずテーブルを作成しましょう-

mysql> create table DemoTable1531
   -> (
   -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   -> StudentName varchar(20)
   -> );
Query OK, 0 rows affected (2.92 sec)
mysql> create index Name_index1 on DemoTable1531(StudentName);
Query OK, 0 rows affected (0.99 sec)
Records: 0  Duplicates: 0  Warnings: 0

挿入コマンド-

mysql> insert into DemoTable1531(StudentName) values('Chris');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable1531(StudentName) values('Robert');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable1531(StudentName) values('David');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1531(StudentName) values('Mike');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1531(StudentName) values('Carol');
Query OK, 1 row affected (0.09 sec)

selectステートメントを使用してテーブルのすべてのレコードを表示する-

mysql> select * from DemoTable1531;

これにより、次の出力が生成されます-

+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
|         5 | Carol       |
|         1 | Chris       |
|         3 | David       |
|         4 | Mike        |
|         2 | Robert      |
+-----------+-------------+
5 rows in set (0.00 sec)

以下は、SybaseASEと同等のMySQLを実装するためのクエリです-

mysql> EXPLAIN select * from DemoTable1531 where StudentName='Mike';

これにより、次の出力が生成されます-

+----+-------------+---------------+------------+------+---------------+-------------+---------+-------+------+----------+-------------+
| id | select_type | table         | partitions | type | possible_keys | key         | key_len | ref   | rows | filtered | Extra       |
+----+-------------+---------------+------------+------+---------------+-------------+---------+-------+------+----------+-------------+
|  1 | SIMPLE      | DemoTable1531 | NULL       | ref  | Name_index1   | Name_index1 | 63      | const |    1 | 100.00   | Using index |
+----+-------------+---------------+------------+------+---------------+-------------+---------+-------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)