Could some one please provide how to write following sql query using joins. I do not want use not in as well as if possible I would like to replace where condition as well.
SELECT d1.Short_Code
FROM domain1 d1
WHERE d1.Short_Code NOT IN (
SELECT d2.Short_Code
FROM Domain2 d2
)
I am using SQL Server 2008
This article:
may be if interest to you.
In a couple of words, this query:
SELECT d1.short_code
FROM domain1 d1
LEFT JOIN
domain2 d2
ON d2.short_code = d1.short_code
WHERE d2.short_code IS NULL
will work but it is less efficient than a NOT NULL (or NOT EXISTS) construct.
You can also use this:
SELECT short_code
FROM domain1
EXCEPT
SELECT short_code
FROM domain2
This is using neither NOT IN nor WHERE (and even no joins!), but this will remove all duplicates on domain1.short_code if any.
short_code in both tables.LEFT JOIN is less efficient indeed. The question was "how to rewrite without NOT IN" — here's how.
SELECT d1.Short_Code
FROM domain1 d1
LEFT JOIN domain2 d2
ON d1.Short_Code = d2.Short_Code
WHERE d2.Short_Code IS NULL
I would opt for NOT EXISTS in this case.
SELECT D1.ShortCode
FROM Domain1 D1
WHERE NOT EXISTS
(SELECT 'X'
FROM Domain2 D2
WHERE D2.ShortCode = D1.ShortCode
)
NOT EXISTS make?
NOT IN and NOT EXISTS (as long as short_code is not nullable). There will be no "complex OR operations".