Left Inner Join Vs Left Outer Join
Left outer join fetches data if present in the left table.
Left inner join vs left outer join. This is because it is no longer a left anti semi join. An outer join brings in all matching and non matching rows and then a filter is applied to eliminate the. Outer join are of 3 types. It is actually processed in a different way.
By definition an outer join left join or right join has to do all the work of an inner join plus the extra work of null extending the resultsit would also be expected to return more rows further increasing the total execution time simply due to the larger size of the result set. Inner join fetches data if present in both the tables. If we use inner join left outer join right outer join full outer join keywords in the sql statement to join the tables then its an explicit join basically we are specifying join condition explicitly for more info click here if we do not specify join condition but just separate the tables with and specify join condition in where clause then they are. Logically this is also a left anti semi join but the resulting plan is missing the left anti semi join operator and seems to be quite a bit more expensive than the not in equivalent.
A left join is absolutely not faster than an inner joinin fact its slower.
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Gallery of Left Inner Join Vs Left Outer Join
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