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Computer Science · Class 12
Update, append, delete, and make-table queries modify data and require preview, validation, and backup.
PracticeA new row must satisfy required fields, data types, key uniqueness, validation, and relationship rules.
PracticeExpressions in controls produce row calculations, group totals, grand totals, dates, and page numbers.
PracticeAn expression derives a value from existing fields and should use correct names, types, parentheses, and null handling.
PracticeWidths, hidden columns, frozen fields, and display formats improve viewing without changing underlying values.
PracticeA selection control can show meaningful text while storing a related key, reducing typing errors.
Practice