The WHERE clause of the outer query uses a > ANY condition to check for duplicates. It will delete any row that has a rowid greater than at least one other row. This ensures that all but one of the rows that match your conditions is met, therefore removing all duplicates. So, how doe...
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To make sure there are no duplicates added in future, we can extend the previous set of queries to add aUNIQUEconstraint to the column. # Step1:CopydistinctvaluestotemporarytableCREATETEMPORARYTABLEtmp_user (SELECTid, nameFROMuserGROUPBYname ); # Step2: RemoveallrowsfromoriginaltableDELETEFROMuser...
Select * into #Temp_customers1 from customers1 where 1 = 2 Insert into #Temp_customers1 select * from customers1 Group by Custid,CustName, CustCity, Passport_Number Having count(*) > 1 Now the situation is that the duplicate row is in the local temporary table. All we need to now is...
LooseScan:Scan a subquery tableusingan index that enables asinglevaluetobe chosenfromeachsubquery's value group. Materialize the subqueryintoan indexed temporary table thatisusedtoperform ajoin,wherethe indexisusedtoremove duplicates. The index might also be used laterforlookupswhenjoining the temporary...
(ASTSelectQuery::Expression::GROUP_BY, std::move(group_expression_list)); select_query->setExpression(ASTSelectQuery::Expression::HAVING, std::move(having_expression)); select_query->setExpression(ASTSelectQuery::Expression::ORDER_BY, std::move(order_expression_list)); select_query->set...
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Use a sqlcmd command line to connect to SQL Server under the Dedicated Administrator Connection (DAC) and execute the modified Transact-SQL script. For example: Console Copy sqlcmd -S PRODSERV1\MSSQLSERVER -A -E -i c:\temp\remove_duplicates.sql Restart SQL Server in Multi-User mode,...
These five rows are combined with the results of the first SELECT by using the UNION ALL keywords. This example doesn't remove the duplicates between the two sets of five rows. The final result has 10 rows. SQL Copy USE AdventureWorks2022; GO IF OBJECT_ID('dbo.EmployeeOne', 'U') IS...
The GROUP BY clause lists column expressions used to form a summary row for each group of selected rows. The list can contain several column expressions separated by commas, but a statement can contain only one GROUP BY clause. Action: Remove one of the GROUP BY clauses and, if necessary,...