Eliminate empty columns in datasets with Power Query. ... Add a custom column to the summary table to compare the `Count` and `Null Count` values. ... Power Query : Instantly Remove All Null Columns.

Efficient query optimization is critical to the performance of query processing in a database system. The same is true for XML databases and queries. XML queries naturally carry a tree-shaped search ...

The XML driver supports the full range of SQL queries:. Simple queries (e.g., SELECT * FROM table): Data is read directly from the XML file.; Complex queries (e.g., using WHERE, JOIN, ORDER BY, GROUP ...

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