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Previous implementation

Previous implementation – UNION/JOIN query in Access

  • Query is messy:

    • query for each column name
    • query for extra rows in each of the 2 tables
    • extra predicates for nulls
    • extra predicates to flag duplicate rows
      • (should table not have a primary key)

  • Access permits union across dissimilar columns (different data types)

  • Access DOES permit inner join and union across linked tables from different DBMS, but I have not tested this.

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