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5 everyday actions that Power Query does better than regular Excel tools

Any null values will show as blank cells in the final Excel table. If you'd prefer to fix this within the Power Query Editor, ...
TechRepublic

How to query multiple tables in SQL

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...