関連ワード:  ddl commands syntax and examples    ddl commands with syntax and examples in oracle    ddl commands in sql with syntax and examples    hive ddl commands with syntax and examples    ddl commands in sql with syntax and examples ppt    explain ddl commands with syntax and examples    ddl and dml commands with syntax and examples    explain ddl and dml commands with syntax and examples    what is ddl and its commands    list ddl commands with syntax