參考教程

窗口函數的使用：(over就是使用窗口函數）

具體語法如下：over (partition by xxx order by xxx rows between xxx and xxx?)

設置窗口大小：rows between xx and xx

preceding:往前 3 precedingfollowing：往后 3 followingcurrent row:當前行unbounded:起點unbounded preceding:從前面的起點unbouned following :表示到后面的終點#先前3個窗口over(partition by xx order by xxx rows between 3 preceding and current row)#向后3個窗口over(partition by xx order by xxx rows between 3 following and current row)或者over(partition by xx order by xxx rows between current row and 3 following)#開始到當前組over(partition by xx order by xxx row between?unbounded preceding and current row)#當前到結束over(partition by xx order by xxx row between??current row and? unbounded following)

設定好窗口之后，就是各種函數的使用

#sum,avg,min,max 函數#row_number() 12345 #rank() 12234 #dense_rank() 122345#ntile(x):x表示分組的組數# percent_rank() :row_number-1/total_number-1cume_dist : row_number/total_number# lead() leg() first_value() last_value()

參考教程#聚合 grouping sets with rollup with cube

#()表示所有

group by a,b,c grouping sets((a,b,c),(a,b),())

# with rollup 相當于((a,b,c),(a,b),(a),())

group by a,b,c with rollup

#with cube 相單與 ((a),(b),(c),(a,b),(a,c),(b,c),(a,b,c),())

參考教程

# 并集#并集并去重union [distinct]union all#交集intersect [distinct]intersect all#補集exceptexcept [all]minusminus [all]

參考教程.

語法：LATERAL VIEW udtf(expression) tableAlias AS columnAlias (',' columnAlias)

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