dongxi1680 2015-07-19 05:56
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通过乘法和四舍五入更新列值

i want to multiply my db column( ".$subject_column."_theory) value with 10/7( my subject total is 70, and i want to convert it to 100 for finding the grade.) also after multiplication the result must be rounded off

    $update_subject_statement4 = "UPDATE ".$track_table_name."

    SET `".$subject_column."` =IF(`".$subject_column."_theory`='ab',0,`".$subject_column."_theory`) WHERE
                                     evaluation_division="."'$eval_div' AND evaluation_config_id = ".$config_id." AND stream_index = ".$stream_index;   
                                    $additional_sum_update_query = $this->db->query($update_subject_statement4);
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1条回答 默认 最新

  • doz97171 2015-07-19 06:09
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    $update_subject_statement4 = "UPDATE ".$track_table_name."
    
    SET `".$subject_column."` = ROUND(IF(`".$subject_column."_theory`='ab',0,`".$subject_column."_theory`) * 7 / 10) 
    WHERE
    evaluation_division="."'$eval_div' 
    AND evaluation_config_id = ".$config_id." 
    AND stream_index = ".$stream_index;   
    
    $additional_sum_update_query = $this->db->query($update_subject_statement4);
    

    1st: we multiplied your value with 7/10

    IF(".$subject_column."_theory='ab',0,".$subject_column."_theory) * 7 / 10

    2nd: we rounded it

    ROUND( IF(".$subject_column."_theory='ab',0,".$subject_column."_theory) * 7 / 10 )

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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