static @NotNull Period<Timestamp> | 
DSL.period(Name name) | 
Create a named  Period reference.  
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static <T> @NotNull Period<T> | 
DSL.period(Name name,
      Class<T> type) | 
Create a named  Period reference.  
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static <T> @NotNull Period<T> | 
DSL.period(Name name,
      DataType<T> type) | 
Create a named  Period reference.  
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static @NotNull Period<Timestamp> | 
DSL.systemTime() | 
Create a  SYSTEM_TIME Period reference.  
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static <T> @NotNull Period<T> | 
DSL.systemTime(Class<T> type) | 
Create a  SYSTEM_TIME Period reference.  
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static <T> @NotNull Period<T> | 
DSL.systemTime(DataType<T> type) | 
Create a  SYSTEM_TIME Period reference.  
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