The external data source could be another DBMS (database management system) like Oracle or SQL Server, or just an Excel sheet.
外部数据源可以是另一个DBMS(数据库管理系统),比如Oracle或SQLServer,也可以仅仅是Excel 文件。
What you can pick up when you walk around your office can't be seen on an Excel sheet.
你在办公室走动时发现的情况是你在Excel表格上看不到的。
What you can pick up when you walk around your office can't be seen on an Excel sheet.
你在办公室走动时发现的情况是你在Excel表格上看不到的。
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