Finding records in one table that exist in another is what IN() and EXISTS() are for. In general, if the column(s) are indexed, EXISTS() will be more efficient.

SELECT
    Id,
    col2,
    col3
FROM
    Data
WHERE
    EXISTS
    (
     SELECT
        *
     FROM
        All_Id
     WHERE
        Data.Id = All_Id.Id
    );

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In reply to Re^3: SQL Select by chacham
in thread SQL Select by Scully4Ever

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