How to find rows that either 1) does not exist in either table or 2) differ in two tables
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Hi,
I am trying to create a script that will compare the indexes in two different databases.
I am trying to write a query that will show me indexes that exist in either one db or the other OR that differ in terms of name or column list.
I know how to find indexes that exist in both dbs or that exist in one and not the other. So I could do a union but I am certain there must be a way to write this query (that I am unaware of) so that I only need to make one pass through the data.
I am on SS2005 and both dbs are on the same machine. I believe anyone should be able to run this since it is using system views.
Here is what I have (that is not returning the differences only):
SELECT A.table_name, B.table_name, A.index_name, B.index_name, A.index_cols, B.index_cols
FROM
(
SELECT obj.name as table_name,
idx.name AS index_name,
dbo.fun_index_collist(idx.object_id, idx.index_id) AS index_cols
FROM [DB1].sys.indexes idx JOIN [DB1].sys.objects obj
ON idx.object_id =obj.object_id
) as A
FULL OUTER JOIN
(
SELECT obj.name as table_name,
idx.name AS index_name,
dbo.fun_index_collist(idx.object_id, idx.index_id) AS index_cols
FROM [DB2].sys.indexes idx JOIN [DB2].sys.objects obj
ON idx.object_id =obj.object_id
) as B
ON A.table_name = B.table_name
WHERE
A.table_name is null or B.table_name is null or
(A.table_name is not null or B.table_name is not null and
(
(A.index_name <> B.index_name) or
(A.index_cols <> B.index_cols)
)
)
Thanks for helping! I will continue banging my head against the proverbial wall.
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I'm not sure if this does what you want exactly but you could use the EXCEPT operator.
Something like this (I couldn't complete test it because I don't have dbo.fun_index_collist), but I think it does what you want otherwise) :
(SELECT obj.name as table_name,idx.name AS index_name,dbo.fun_index_collist(idx.object_id, idx.index_id) AS index_colsFROM [DB1].sys.indexes idx JOIN [DB1].sys.objects objON idx.object_id =obj.object_id)EXCEPT(SELECT obj.name as table_name,idx.name AS index_name,dbo.fun_index_collist(idx.object_id, idx.index_id) AS index_colsFROM [DB2].sys.indexes idx JOIN [DB2].sys.objects objON idx.object_id =obj.object_id)UNION(SELECT obj.name as table_name,idx.name AS index_name,dbo.fun_index_collist(idx.object_id, idx.index_id) AS index_colsFROM [DB2].sys.indexes idx JOIN [DB2].sys.objects objON idx.object_id =obj.object_id)EXCEPT(SELECT obj.name as table_name,idx.name AS index_name,dbo.fun_index_collist(idx.object_id, idx.index_id) AS index_colsFROM [DB1].sys.indexes idx JOIN [DB1].sys.objects objON idx.object_id =obj.object_id)You could also use one of the database compariason products out there, like RedGate SQLCompare or APEXSQLDiff.
Jack Corbett
Consultant - Straight Path Solutions
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Jack,
Thank you for your response. Sorry for the delay (got pulled onto something else for a couple of days). I am using your solution. It works just as I need.
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