CODEWITHSUNDEEP
t-sqlleft-jointable-variable
Josh Robinson
Josh Robinson

Reputation: 452

Deleting using left join and a table variable

Maybe I'm missing a bracket or something but I'm having a hard time deleting rows from a table variable where I'm left joining and looking for the key I'm joining on. If it has a value, then I get rid of it. The problem is that I can't get the query to parse. Any ideas?

declare @MrTemp 
(
    key1 int
   ,key2 int
)

insert into @MrTemp
select key1, key2 from ASourceTable

delete  
from @MrTemp mt
left join ARealTable art on mt.key1 = art.key1 and mt.key2 = art.key2 
where art.key1 is not null and art.key2 is not null

Upvotes: 1

Views: 2632

Answers (3)

Dog Ears
Dog Ears

Reputation: 10015

You can only delete from one table at a time:

to delete from @MrTemp [where there is a matching record in ARealTable]

delete mt
from @MrTemp mt left join ARealTable art on mt.key1 = art.key1 and mt.key2 = art.key2 where art.key1 is not null and art.key2 is not nu

ll

or. to delete from ARealTable [again where the record has a corresponding record in ARealTable] 

delete art
from @MrTemp mt left join ARealTable art on mt.key1 = art.key1 and mt.key2 = art.key2 where art.key1 is not null and art.key2 is not null

Upvotes: 1

cmsjr
cmsjr

Reputation: 59175

You need to reference the alias after the delete but before the from for the table you want to delete from

delete art 
from @MrTemp mt left join ARealTable art on 
mt.key1 = art.key1 and mt.key2 = art.key2 
where art.key1 is not null and art.key2 is not null

Upvotes: 1

John Saunders
John Saunders

Reputation: 161773

DELETE @MrTemp
FROM @MrTemp mt LEFT JOIN ...

Upvotes: 2

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