Question

mysql_query("SELECT DISTINCT lo_category FROM questions where question_text = '" . mysql_real_escape_string($_GET["choice"]) . "'");

所以从上面的查询我会得到与选择匹配的lo_categories。我如何得到类别的数量，例如

Category Cognitive : 3 matches
Category Psychomotor : 1 matches
Category Perception : 0 matches

($_GET["choice"])来自html复选框，有多个选项。这是我的问题表。

question_id  question_text               keyword  lo_category lo_domain
      1     Define the word paraphrase    Define  Knowledge   Cognitive 
      2     describe the meaning of NLP  describe Knowledge   Cognitive 
      3     describe the meaning of NLP  describe Perception  Psychomotor 
      4     describe the meaning of NLP  describe Receiving   Affective 
      5     Define this                    Define Knowledge   Cognitive

更新了这个，有错误。请帮助我好丢失!!!

$yes=mysql_query("select lo_category, count(*) from questions where question_text='" . mysql_real_escape_string($_GET["choice"]) . "' group by lo_category order by lo_category");

while ($row = mysql_fetch_assoc($yes)) {
    echo '<b>Category :</b> ' . $row['lo_category'] . ',' . $row['count(*)'] . '<br />'; 
}

请帮助我，我是这方面的初学者。提前谢谢!!!

Answer 1

select lo_category, count(lo_category) as countOflo_category group by lo_category

Answer 2

通常情况如下：

select lo_category, count(*) from questions where question_text=<choice> group by lo_category order by lo_category

Answer 3

$ result = mysql_query（“SELECT DISTINCT lo_category FROM questions where question_text ='”。mysql_real_escape_string（$ _ GET [“choice”]）。“'”）;

mysql_num_rows（$ result）这将返回你的reslut集包含的行的数量

如何计算与此查询中的字符串文本匹配的数据数量？

3 个答案: