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                            [TOC]

列處理: 在select中,只拿需要的列,如果有,盡量使用分區過濾,少用`select *`
行處理: 在分區剪裁中,當使用外關聯時,如果將副表的過濾條件寫在where后面,那么就會先全表關聯,之后再過濾.

1. 測試先關聯兩張表,再用where條件過濾
~~~
hive> select o.id from bigtable b join ori o on o.id = b.id where o.id <= 10;
~~~

2. 通過子查詢后,再關聯表
~~~
hive> select b.id from bigtable b join(select id from ori where id <= 10) o on b.id = o.id;
~~~


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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