2017年9月27日

sparksql(review part...to be continue)

摘要： relational database every relation has a schema defining fields in columns a set of relations relation: a table with rows and columns schema: name of 阅读全文

posted @ 2017-09-27 01:21 satyrs 阅读(114) 评论(0) 推荐(0) 编辑

semi-structured data(notes)

摘要： data management data model , schema data model: colletion of concepets for describing data schema: using model, a description of a particular collecti 阅读全文

posted @ 2017-09-27 00:41 satyrs 阅读(212) 评论(0) 推荐(0) 编辑

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