Given the source has duplicates and you aren’t using MERGE fully, I’d use an INSERT. INSERT dbo.tbl1 (col2,col3) SELECT DISTINCT col2,col3 FROM #tmp src WHERE NOT EXISTS ( SELECT * FROM dbo.tbl1 tbl WHERE tbl.col2 = src.col2 AND tbl.col3 = src.col3) The reason MERGE fails is that it isn’t checked row by row.
First, you specify the target table and the source table in the MERGE clause.. Second, the merge _condition determines how the rows from the source table are matched to the rows from the target table. It is similar to the join condition in the join clause. Typically, you use the key columns either primary key or unique key for matching.. Third, the merge _condition results in three states …
3/12/2018 · Check out these other T-SQL tips on MSSQLTips.com . Check out these additional resources: Using MERGE in SQL Server to insert, update and delete at the same time; Resolving the MERGE statement attempted to UPDATE or DELETE the same row more than once error; Using the SQL Server MERGE Statement to Process Type 2 Slowly Changing Dimensions, SQL Server MERGE: The Essential Guide to MERGE Statement, MERGE (Transact-SQL) – SQL Server | Microsoft Docs, SQL Server MERGE Statement overview and examples, SQL Server SELECT DISTINCT, Just don’t use Temp directily as Source but filter it for distinct values first. MERGE INTO Frames as Target using (SELECT DISTINCT * FROM Temp) as Source on Source.Code=Target.Code WHEN MATCHED THEN UPDATE set Target.Description=Source.Description WHEN NOT MATCHED THEN insert (Code,Description) values (Code,Description);, The query uses the combination of values in all specified columns in the SELECT list to evaluate the uniqueness. If you apply the DISTINCT clause to a column that has NULL, the DISTINCT clause will keep only one NULL and eliminates the other. In other words,.
So for each distinct value in a column of one table I want to insert that unique value into a row of another table. list = select distinct (id) from table0 for distinct _id in list insert into table1 (id) values ( distinct.
The SQL SELECT DISTINCT Statement . The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different ( distinct ) values.
