what is high level document(HLD),lowlevel document(LLD),MAPPING documents ? what is the stuff they contains?

Sarat

• Nov 13th, 2014

High Level Design document will prepare by the Data Modeling people to generate the required data warehouse schema for the ETL purpose. LLD : Low Level Design is the design document which will be use...

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what is Low level document(LLD) and high level document(hld) and mapping document what they contain?