MySQL 8.4 發行說明
給定一個綱要名稱，此程序會建立一個同義綱要，其中包含參照原始綱要中所有表格和檢視的檢視。例如，這可用於建立較短的名稱來參照具有長名稱的綱要 (例如，使用 info 而非 INFORMATION_SCHEMA)。
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| world |
+--------------------+
mysql> CALL sys.create_synonym_db('INFORMATION_SCHEMA', 'info');
+---------------------------------------+
| summary |
+---------------------------------------+
| Created 63 views in the info database |
+---------------------------------------+
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| info |
| mysql |
| performance_schema |
| sys |
| world |
+--------------------+
mysql> SHOW FULL TABLES FROM info;
+---------------------------------------+------------+
| Tables_in_info | Table_type |
+---------------------------------------+------------+
| character_sets | VIEW |
| collation_character_set_applicability | VIEW |
| collations | VIEW |
| column_privileges | VIEW |
| columns | VIEW |
...