只有在查询的from子句包含周期规范时，DB 2才会自动且透明地访问历史数据。
DB2 accesses the historical data automatically and transparently only if the FROM clause of the query includes the period specifications.
只有在查询的from子句包含周期规范时，DB 2才会自动且透明地访问历史数据。
DB2 accesses the historical data automatically and transparently only if the FROM clause of the query includes the period specifications.
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