在放棄之前檢查是否存在

MySQL >= 3.19

 placeholderCopyDROP TABLE IF EXISTS MyTable;

PostgreSQL >= 8.x

 placeholderCopyDROP TABLE IF EXISTS MyTable;

SQL Server >= 2005

 placeholderCopyIf Exists(Select * From Information_Schema.Tables
          Where Table_Schema = 'dbo'
            And Table_Name = 'MyTable')
  Drop Table dbo.MyTable

SQLite >= 3.0

 placeholderCopyDROP TABLE IF EXISTS MyTable;