Updating existing records in a dataset

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Source(Employee ID int, Employee Name varchar(10), CONSTRAINT Source_PK PRIMARY KEY(Employee ID)); GO INSERT dbo.Target(Employee ID, Employee Name) VALUES(100, 'Mary'); INSERT dbo.

For example, you can use the MERGE statement to perform the following operations: It is important to understand how the source and target data are merged into a single input stream and how additional search criteria can be used to correctly filter out unneeded rows.You will use the WHERE clause of the UPDATE statement to restrict the update to a single row. The basic syntax is: INSERT, table name, column list, VALUES, and then a list of the values to be inserted.The two hyphens in front of a line indicate that the line is a comment and the text will be ignored by the compiler.In this case, the comment describes a permissible variation of the syntax.Cleaning data is an essential step in increasing the quality of data.

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