How Can I Return Multiple Values in a Single Column Using T-SQL?

Efficiently Retrieving Multiple Values into a Single T-SQL Column

Database queries often require retrieving multiple associated values for a single record. This is particularly relevant when dealing with entities possessing multiple attributes or identifiers. This article details a T-SQL solution for consolidating multiple aliases associated with a user into a single column.

The solution employs a user-defined function, [dbo].[GetAliasesById], which cleverly utilizes COALESCE() to build a comma-separated string of aliases. The function iterates through the UserAliases table, appending each alias to a variable, adding a comma and space separator only where needed. This prevents trailing commas in the output.

The main query then uses SELECT to retrieve the UserID and the alias list generated by the function. Grouping the results by UserID ensures that each user's aliases appear only once in the final result set.

This method offers a flexible and customizable approach to retrieving multiple values within a single column. The function's design allows for easy adaptation to various business needs, optimizing data retrieval and manipulation.

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