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From Garry Chen <>
Subject RE: left join error
Date Tue, 06 Oct 2015 14:24:45 GMT
He fully qualify query should be as
select master_request_tab.date_key, master_request_tab.ref, '' from master_request_tab
 left join dm_search_eng  on substr(master_request_tab.ref, 1, length(dm_search_eng.engine))
= dm_search_eng.engine where dm_search_eng.engine is null;

and still showing error.   The length(dm_search_eng.engine) just return a number as part of
the substr parameter why it throw out error?


From: Msr Msr []
Sent: Tuesday, October 06, 2015 9:54 AM
Subject: Re: left join error

Try using alias qualified columns fir common columns in bith tables...something like this
select date_key,ref, '' from master_request_tab a left join dm_search_eng b on substr(ref,
1,length(a.engine)) = b.engine where a.engineis null;
On Oct 6, 2015 9:19 AM, "Garry Chen" <<>>
Hi All,
                Do you guys see any error in the following left join sql statement?  However,
 the hive give me error as “Error: Error while compiling statement: FAILED: SemanticException
[Error 10017]: Line 1:75 Both left and right aliases encountered in JOIN 'engine' (state=42000,code=10017)”.
 Please let me kow where I am doing wrong.  Thank you.

select date_key,ref, '' from master_request_tab left join dm_search_eng on substr(ref, 1,
length(engine)) = engine where engine is null;

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