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2025-01-17 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >
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This article mainly explains "the basic use of Hive". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the basic use of Hive".
Hive has three complex data types: ARRAY, MAP, and STRUCT. ARRAY and MAP are similar to Array and Map in Java, while STRUCT, like Struct in C, encapsulates a collection of named fields, and complex data types allow for any level of nesting.
Create a datasheet
Create table test (name string,friends array,children map,address struct) row format delimited fields terminated by', 'collection items terminated by' _ 'map keys terminated by': 'lines terminated by'\ n
View data structures
Hive (default) > desc test;OKcol_name data_type commentname string friends array children map address struct Time taken: 0.053 seconds, Fetched: 4 row (s)
test data
Liming,zhangsan_lisi,xiao ming:12_xiaoxiao ming:3,haidian_beijingwangwu,zhaoliu_sunba_qianer,xiao wang:18_xiaoxiao wang:9,chao yang_beijing
Load test data
Hive (default) > load data local inpath'/ opt/module/data/people.txt' into table test;Loading data to table default.testTable default.test stats: [numFiles=1, numRows=0, totalSize=141, rawDataSize=0] OKTime taken: 0.354 seconds
View data content
Hive (default) > select * from test;OKtest.name test.friends test.children test.addressliming ["zhangsan", "lisi"] {"xiao ming": 12, "xiaoxiao ming": 3} {"street": "haidian", "city": "beijing"} wangwu ["zhaoliu", "sunba", "qianer"] {"xiao wang": 18, "xiaoxiao wang": 9} {"street": "chao yang", "city": "beijing"} Time taken: 0.069 seconds, Fetched: 2 row (s)
# # Mysql to view the structure of hive table
View the fields of the table
# # loading data into hive
LOAD DATA LOCAL (local files need to add LOCAL) INPATH 'file path' OVERWRITE INTO TABLE table name
Thank you for your reading, the above is the content of "the basic use of Hive", after the study of this article, I believe you have a deeper understanding of the basic use of Hive, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!
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