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09-Sep-2020 11:08

A recent product update required a data migration that left us scratching our heads trying to figure out why our queries weren’t working.We’ll provide some context about the schema of the table we were modifying, explain the changes we needed to make, then explain how we used boolean algebra to help debug the issue.The MERGE statement basically merges data from a source result set to a target table based on a condition that you specify and if the data from the source already exists in the target or not.The new SQL command combines the sequence of conditional INSERT, UPDATE and DELETE commands in a single atomic statement, depending on the existence of a record.In this example I will take a Products table as the target table and Updated Products as the source table containing an updated list of products. I will then use the MERGE command to synchronize the target table with the source table. First let's create a target table and a source table and populate some data to these tables.

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The filtering pass for condition occurs at a different time in each query, and operates over different intermediate results, so it’s easy to see how the two queries are not equivalent. column PNR =Primary Key This table takes input from users. Refer to the documentation for the CREATE PROCEDURE syntax for details and/or see e.g. Note that it's still a good idea to wrap the two statements in a transaction inside the stored procedure.



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