列转行
测试数据
hive> select * from col_lie limit 10; OK col_lie.user_id col_lie.order_id 104399 1715131 104399 2105395 104399 1758844 104399 981085 104399 2444143 104399 1458638 104399 968412 104400 1609001 104400 2986088 104400 1795054
把相同user_id的order_id按照逗号转为一行
select user_id, concat_ws(',',collect_list(order_id)) as order_value from col_lie group by user_id limit 10; //结果(简写) user_id order_value 104399 1715131,2105395,1758844,981085,2444143
总结
使用函数：concat_ws(',',collect_set(column))
说明：collect_list 不去重，collect_set 去重。 column的数据类型要求是string
行转列
测试数据
hive> select * from lie_col; OK lie_col.user_id lie_col.order_value 104408 2909888,2662805,2922438,674972,2877863,190237 104407 2982655,814964,1484250,2323912,2689723,2034331,1692373,677498,156562,2862492,338128 104406 1463273,2351480,1958037,2606570,3226561,3239512,990271,1436056,2262338,2858678 104405 153023,2076625,1734614,2796812,1633995,2298856,2833641,3286778,2402946,2944051,181577,464232 104404 1815641,108556,3110738,2536910,1977293,424564 104403 253936,2917434,2345879,235401,2268252,2149562,2910478,375109,932923,1989353 104402 3373196,1908678,291757,1603657,1807247,573497,1050134,3402420 104401 814760,213922,2008045,3305934,2130994,1602245,419609,2502539,3040058,2828163,3063469 104400 1609001,2986088,1795054,429550,1812893 104399 1715131,2105395,1758844,981085,2444143,1458638,968412 Time taken: 0.065 seconds, Fetched: 10 row(s)
将order_value的每条记录切割为单元素
select user_id,order_value,order_id from lie_col lateral view explode(split(order_value,',')) num as order_id limit 10; //结果 user_id order_value order_id 104408 2909888,2662805,2922438,674972,2877863,190237 2909888 104408 2909888,2662805,2922438,674972,2877863,190237 2662805 104408 2909888,2662805,2922438,674972,2877863,190237 2922438 104408 2909888,2662805,2922438,674972,2877863,190237 674972 104408 2909888,2662805,2922438,674972,2877863,190237 2877863 104408 2909888,2662805,2922438,674972,2877863,190237 190237 104407 2982655,814964,1484250,2323912,2689723,2034331,1692373,677498,156562,2862492,338128 2982655 104407 2982655,814964,1484250,2323912,2689723,2034331,1692373,677498,156562,2862492,338128 814964 104407 2982655,814964,1484250,2323912,2689723,2034331,1692373,677498,156562,2862492,338128 1484250 104407 2982655,814964,1484250,2323912,2689723,2034331,1692373,677498,156562,2862492,338128 2323912 Time taken: 0.096 seconds, Fetched: 10 row(s)