Crosstab Queries with TRANSFORM and PIVOT in Access SQL
A normal totals query places each group on a separate row. A crosstab query goes further by turning one grouping dimension into columns, creating…
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Parameter Queries in Access SQL with QueryDef and VBA
Building SQL by concatenating form values may look convenient, but dates, apostrophes, decimal separators, Nulls, and optional filters quickly make the string fragile. Parameter…
UNION and UNION ALL Queries in Access SQL
Sometimes two tables describe the same kind of output even though they store different business events. Customers and suppliers can form one contact list;…
Subqueries in Access SQL with IN, EXISTS, and Correlation
Some data questions are easiest to express as a query inside another query: customers who have ordered, products that have never sold, orders containing…