These data sources range from powerful relational databases such as mySQL to non-relational objects such as Excel spreadsheets.
这些数据源包括像mySQL之类的强大的关系数据库，也包括像Excel电子表格之类的非关系对象。
Relational databases such as Oracle or Microsoft SQL Server are non-temporal.
关系数据库如Oracle或MicrosoftSQLServer是无时态的。
Relational databases such as Oracle or Microsoft SQL Server are non-temporal.
关系数据库如Oracle或MicrosoftSQLServer是无时态的。
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