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Aliasing (Azure Synapse Analytics, Parallel Data Warehouse)

Applies to: Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric

Aliasing allows the temporary substitution of a short and easy-to-remember string in place of a table or column name in Azure Synapse Analytics or Analytics Platform System (PDW) SQL queries. Table aliases are often used in JOIN queries because the JOIN syntax requires fully qualified object names when referencing columns.

Aliases must be single words conforming to object naming rules. For more information, see Database identifiers. Aliases cannot contain blank spaces and cannot be enclosed in either single or double quotes.

Syntax

object_source [ AS ] alias

Arguments

object_source

The name of the source table or column.

AS

An optional alias preposition. When working with range variable aliasing, the AS keyword is prohibited.

alias

The desired temporary reference name for the table or column. Any valid object name can be used. For more information, see "Object Naming Rules" in the Analytics Platform System (PDW) product documentation.

Examples: Azure Synapse Analytics and Analytics Platform System (PDW)

The following example shows a query with multiple joins. Both table and column aliasing are demonstrated in this example. These examples use the AdventureWorks sample databases.

  • Column Aliasing: Both columns and expressions involving columns in the select list are aliased in this example. SalesTerritoryRegion AS SalesTR demonstrates a simple column alias. Sum(SalesAmountQuota) AS TotalSales demonstrates

  • Table Aliasing: dbo.DimSalesTerritory AS st shows creation of the st alias for the dbo.DimSalesTerritory table.

-- Uses AdventureWorks

SELECT LastName, SUM(SalesAmountQuota) AS TotalSales, SalesTerritoryRegion AS SalesTR,  
    RANK() OVER (PARTITION BY SalesTerritoryRegion ORDER BY SUM(SalesAmountQuota) DESC ) AS RankResult  
FROM dbo.DimEmployee AS e  
INNER JOIN dbo.FactSalesQuota AS sq ON e.EmployeeKey = sq.EmployeeKey  
INNER JOIN dbo.DimSalesTerritory AS st ON e.SalesTerritoryKey = st.SalesTerritoryKey  
WHERE SalesPersonFlag = 1 AND SalesTerritoryRegion != N'NA'  
GROUP BY LastName, SalesTerritoryRegion;

The AS keyword can be excluded, but is often included for readability.

-- Uses AdventureWorks

SELECT LastName, SUM(SalesAmountQuota) TotalSales, SalesTerritoryRegion SalesTR,  
RANK() OVER (PARTITION BY SalesTerritoryRegion ORDER BY SUM(SalesAmountQuota) DESC ) RankResult  
FROM dbo.DimEmployee e  
INNER JOIN dbo.FactSalesQuota sq ON e.EmployeeKey = sq.EmployeeKey  
INNER JOIN dbo.DimSalesTerritory st ON e.SalesTerritoryKey = st.SalesTerritoryKey  
WHERE SalesPersonFlag = 1 AND SalesTerritoryRegion != N'NA'  
GROUP BY LastName, SalesTerritoryRegion;

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