Question

我有几个陈述，我似乎无法理解如何结合。

现在，我的代码看起来像这样：

if(!$question && $filter){
    $qry = mysql_query("SELECT * FROM mbr_qa_questions WHERE q_tags RLIKE '[[:<:]]" . $filter . "[[:>:]]' ORDER BY q_id ASC LIMIT $start, 1 ");
} else if($question && !$filter){
    $qry = mysql_query("SELECT * FROM mbr_qa_questions WHERE MATCH (q_title, q_description, q_tags) AGAINST ('$question') ORDER BY q_id ASC LIMIT $start, 1 ");
} else if($question && $filter){
    //NEED A COMBINED QUERY OF THE FIRST TWO HERE.
} else {
    $qry = mysql_query("SELECT * FROM mbr_qa_questions ORDER BY q_id ASC LIMIT $start, 1");
}

我有几列（q_title, q_description, q_tags）已编入索引，但我不确定这些语句是否足够有效。

长话短说，我需要这样的陈述：

SELECT * FROM mbr_qa_questions WHERE q_tags RLIKE '[[:<:]]" . $filter . "[[:>:]]' ORDER BY q_id ASC LIMIT $start, 1

和本声明：

SELECT * FROM mbr_qa_questions WHERE MATCH (q_title, q_description, q_tags) AGAINST ('$question') ORDER BY q_id ASC LIMIT $start, 1

合并成一个声明。另外，如果你这么倾向，请告诉我这是多么低效，并可能建议一个更好的方法？

Answer 1

使用AND运算符

if(!$question && $filter){
    $qry = mysql_query("SELECT * FROM mbr_qa_questions WHERE q_tags RLIKE '[[:<:]]" . $filter . "[[:>:]]' ORDER BY q_id ASC LIMIT $start, 1 ");
} else if($question && !$filter){
    $qry = mysql_query("SELECT * FROM mbr_qa_questions WHERE MATCH (q_title, q_description, q_tags) AGAINST ('$question') ORDER BY q_id ASC LIMIT $start, 1 ");
} else if($question && $filter){
    //combined using AND 
    $qry = mysql_query("SELECT * FROM mbr_qa_questions WHERE MATCH (q_title, q_description, q_tags) AGAINST ('$question') AND q_tags RLIKE '[[:<:]]" . $filter . "[[:>:]]' ORDER BY q_id ASC LIMIT $start,     1 ");
} else {
    $qry = mysql_query("SELECT * FROM mbr_qa_questions ORDER BY q_id ASC LIMIT $start, 1");
}

mySQL另一个组合查询

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