hive> SELECT userid ,Sequnce ,ActionTime ?FROM T_BZ_ClientActionLog GROUP BY Sequnce ,ActionTime limit 100;

FAILED: SemanticException [Error 10025]: Line 1:7 Expression not in GROUP BY key 'userid'

userid被要求也處在group by分組字段里面。

這個不同于mysql語句，mysql這樣寫是沒有問題的。

以下是處理方法； hive> SELECT sequnce,actiontime,

collect_set(pagecode),collect_set(actioncode) FROM T_BZ GROUP BY Sequnce ,ActionTime limit 100;

Total jobs = 1

Launching Job 1 out of 1

Number of reduce tasks not specified. Estimated from input data size: 1

In order to change the average load for a reducer (in bytes):

set hive.exec.reducers.bytes.per.reducer=

In order to limit the maximum number of reducers:

set hive.exec.reducers.max=

In order to set a constant number of reducers:

set mapreduce.job.reduces=

Starting Job = job_1407387657227_0043, Tracking URL = http://n1.hadoop:8089/proxy/application_1407387657227_0043/

Kill Command = /app/prog/hadoop/bin/hadoop job ?-kill job_1407387657227_0043

Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 1

2014-08-07 20:07:12,881 Stage-1 map = 0%, ?reduce = 0%

2014-08-07 20:07:24,192 Stage-1 map = 100%, ?reduce = 0%, Cumulative CPU 18.84 sec

2014-08-07 20:07:29,347 Stage-1 map = 100%, ?reduce = 100%, Cumulative CPU 20.71 sec

MapReduce Total cumulative CPU time: 20 seconds 710 msec

Ended Job = job_1407387657227_0043

MapReduce Jobs Launched:

Job 0: Map: 1 ?Reduce: 1 ? Cumulative CPU: 20.71 sec ? HDFS Read: 96397668 HDFS Write: 6969 SUCCESS

Total MapReduce CPU Time Spent: 20 seconds 710 msec

OK

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:20:33 ? ? [] ? ? ?["A0001"]

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:20:37 ? ? ["P001"] ? ? ? ?["A0001"]

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:20:45 ? ? ["P003","P001"] ["A0002","A0001"]

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:07 ? ? ["P003"] ? ? ? ?["A0011"]

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:11 ? ? ["P003","P001"] ["A0017","A0001"]

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:13 ? ? ["P001","P002"] ["A0003","A0001"]

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:22 ? ? ["P002"] ? ? ? ?["A0006"]

可以看到結果的一個集合。

當然如果不想得到集合，可以這樣寫，獲取集合的第一個元素：：

hive> SELECT sequnce,actiontime,collect_set(pagecode)[0],collect_set(actioncode)[0]?FROM T_BZ GROUP BY Sequnce ,ActionTime limit 100;

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:20:33 ? ? ? ? ? ? A0001

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:20:37 ? ? P001 ? ?A0001

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:20:45 ? ? P003 ? ?A0002

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:07 ? ? P003 ? ?A0011

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:11 ? ? P003 ? ?A0017

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:13 ? ? P001 ? ?A0003

00015a21-ef6d-4f05-b04e-ffd98fab2922 ? ?2014-07-24 01:21:22 ? ? P002 ? ?A0006

這樣的結果就和mysql一致了。

當然如果不想去重還可以使用collect_list處理，這兩個函數是HIVE的UDF函數。

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