Use select tag to post the row number, and use "select ... limit 0 $rows" to get the rows.
Use checkbox to select the columns and post the array of the column names, and use "select $columns[0], $columns[1]... from tb" to get the columns.
Use checkbox to select the columns and post the array of the column names, and use "select $columns[0], $columns[1]... from tb" to get the columns.
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