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Avoiding errors concatenating fields with numerical values in SQL Server

 

concatenate stringsThe operator to concatenate in SQL Server is '+', but this operator is also used to add values.

 

Being the same operator for both, the query analyzer makes a concatenation or a sum based on the type of data fields being treated. If the fields are of 'string' type, the operator concatenate, and if it has numeric fields, two integers, for example, it add the two values.

Tips for UPSERT or update using insert in SQL Server

 

Merge SQL

In many cases, especially in ETL processes or data loading to a data warehouse, for example, we would rather use a single sentence or the checking of the existence of a register and its updating. If register doesn't exist we would want to insert it. This combination has been nicknamed UPSERT, although in SQL there is a specific statement to make it, which is MERGE.

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