Abstract: A system and method for data management are provided. In the system, a first sorting function is configured to receive a sorting instruction for sorting a data set from a source, and sort the data set by grouping, from the data items, all the data items corresponding to a same data object into a same group to obtain one or more groups and ordering the one or more groups to obtain a sorted data set, wherein the sorted data set is used for a generation of a processed data set. A second sorting function is configured similarly obtain a different sorted data set according to a different sorting instruction regarding a different data set. A joining function is configured to receive and join processed data sets to obtain a single joined data set, and transmit the single joined data set to a data consumer.

Abstract: A novel quick fastening device comprises a base, an energy storage medium, an impact unit and a driving mechanism; the driving mechanism includes an annular gear, a driving shaft, a crank, a planet gear; the planet gear is placed in the annular gear and engaging with the annular gear, so that it can implement revolution against annular gear, the planet gear implements rotation at the upper end of crank; a clamp shaft for connecting the impact unit is located in the upper end of the connecting rod, the lower end of driving shaft is connected to the rotating energy release unit; the annular gear-planet gear structure to implement the conversion of rotary motion into reciprocating motion, the kinematic trajectory of clamp shaft on the connecting rod approximates to a straight line, so as to reduce the kinetic friction force of load to the maximum extent to avoid wear.

Abstract: A novel quick fastening device comprises a base, an energy storage medium, an impact unit and a driving mechanism; the driving mechanism includes an annular gear, a driving shaft, a crank, a planet gear; the planet gear is placed in the annular gear and engaging with the annular gear, so that it can implement revolution against annular gear, the planet gear implements rotation at the upper end of crank; a clamp shaft for connecting the impact unit is located in the upper end of the connecting rod, the lower end of driving shaft is connected to the rotating energy release unit; the annular gear-planet gear structure to implement the conversion of rotary motion into reciprocating motion, the kinematic trajectory of clamp shaft on the connecting rod approximates to a straight line, so as to reduce the kinetic friction force of load to the maximum extent to avoid wear.