How to return mismatched rows from two tables?

Question

I have created two tables in the same database as below which gives the row
count of tables across all databases before and after an DB restore
operation.
create table before_restore(db_name varchar(100),table_name
varchar(1000),row_count int) insert into before_restore exec sp_msforeachdb 'USE
[?]; select ''?'' as database_name,o.name,max(i.rowcnt ) From [?].sys.objects o
inner join [?].sys.sysindexes i on o.object_id=i.id where o.type=''U'' group by
o.name'
create table after_restore(db_name varchar(100),table_name
varchar(1000),row_count int) insert into after_restore exec sp_msforeachdb 'USE
[?]; select ''?'' as database_name,o.name,max(i.rowcnt ) From [?].sys.objects o
inner join [?].sys.sysindexes i on o.object_id=i.id where o.type=''U'' group by
o.name'
I want to compare these two tables and it should only return me rows that
have changed after the restore operation is complete.
Eg:
Table xyz has rowcount of 100 before restore and the restore was not proper
and after restore count is 50. So it should return me the result set as
below;
Db_name    Table_Name  row_count_before_restore    row_count_after_restore
abc                   xyz                       100                              
   50
Thanks!!!

Answer 1

Something like below perhaps? Btw, I recommend using catalog view and dynamic management views instead of the old system tables (now called compatibility views)...
SELECT
COALESCE(a.db_name, b.db_name) AS db_name
,COALESCE(a.table_name, b.table_name) AS table_name
,a.row_count AS row_count_before_restore
,b.row_count AS row_count_after_restore
FROM before_restore AS b FULL OUTER JOIN after_restore AS a ON b.db_name = a.db_name AND b.table_name = a.table_name
WHERE b.row_count <> a.row_count OR b.db_name IS NULL OR a.db_name IS NULL
Tibor Karaszi, SQL Server MVP |
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