mysql - 如何加速MySQL查询？从 3 个表加载数据

Question

我有 3 个表。第一:“属性”第二:“atributy_value”第三:“产品”

我先有这个查询:

SELECT a.*, p.ATTRIBUTE_CODE, p.ATTRIBUTE_VALUE, p.KATEGORIA  
FROM atributy a JOIN produkty p ON p.ATTRIBUTE_CODE
LIKE CONCAT('%', a.code, '%')
AND
KATEGORIA IN ('$kategoria_sql') 
GROUP BY a.value

我的第二个查询是这样的:

SELECT * FROM atributy_value
INNER JOIN produkty 
ON produkty.ATTRIBUTE_VALUE LIKE CONCAT('%', atributy_value.ValueCode, '%')
AND AttributeCode = '$atribut_kod' 
AND KATEGORIA IN ('$kategoria_sql')
GROUP BY atributy_value.Value

请帮助我从这 2 个查询的第 1 个查询中改进。原因:加载我的网络电子商店的时间太长。

编辑:

$query = mysql_query("
SELECT a.*, p.ATTRIBUTE_CODE, p.ATTRIBUTE_VALUE, p.KATEGORIA  
FROM atributy a JOIN produkty p ON p.ATTRIBUTE_CODE LIKE CONCAT('%', a.code, '%') 
AND KATEGORIA IN ('$kategoria_sql') 
GROUP BY a.value ");

while($result = mysql_fetch_object($query)){

$atribut_kod = $result->code;
$atribut_value = $result->value;
$nazov_produktu = $result->NAZOV;
$value1 = $result->ATTRIBUTE_VALUE;
$value1 = explode(" ", $value1);

$value1_count = count($value1);

echo "<div class=\"parametre_panel\">
<h3>".$atribut_value."</h3>
";

$url_kody .= "$atribut_kod,";

$hodnoty_qry = mysql_query("
SELECT * FROM atributy_value
INNER JOIN produkty ON produkty.ATTRIBUTE_VALUE LIKE CONCAT('%', atributy_value.ValueCode, '%')
AND AttributeCode = '$atribut_kod' 
AND KATEGORIA IN ('$kategoria_sql')  
GROUP BY atributy_value.Value ");

 while($hodnoty_res = mysql_fetch_object($hodnoty_qry)){
 $cislo_hodnoty = $hodnoty_res->ValueCode;
 echo "<input type=\"checkbox\" class=\"ZobrazParametrickeVyhladavanie\"   name=\"value[]\" id=\"$cislo_hodnoty\" value=\"".$atribut_kod."-".$cislo_hodnoty."\"><label for=\"$cislo_hodnoty\">".$hodnoty_res->Value."</label>
 ";

 $url_hodnoty .= "$cislo_hodnoty,";
} //second query while()
echo "</div>";
} //first query while()

编辑 2:

我的表结构

produkty:       http://i.imgur.com/J4Kz2CE.png 
atributy_value: http://i.imgur.com/nX1uRph.png 
atributy:       http://i.imgur.com/mlCa3It.png

索引:

atributy:         http://i.imgur.com/ppMEEOe.png
atributy_value:   http://i.imgur.com/RHAeSiu.png
produkty:         http://i.imgur.com/IUrgy9l.png

Answer 1

您可以尝试以下查询:

SELECT a.*, 
       p.ATTRIBUTE_CODE, 
       p.ATTRIBUTE_VALUE, 
       p.KATEGORIA  
  FROM atributy a 
  JOIN (SELECT * 
          FROM atributy_value
         INNER JOIN produkty 
            ON produkty.ATTRIBUTE_VALUE LIKE CONCAT('%', atributy_value.ValueCode, '%')
           AND AttributeCode = '$atribut_kod' 
           AND KATEGORIA IN ('$kategoria_sql')
         GROUP BY atributy_value.Value) p 
    ON p.ATTRIBUTE_CODE LIKE CONCAT('%', a.code, '%')
   AND KATEGORIA IN ('$kategoria_sql') 
 GROUP BY a.value

在内部查询中仅选择需要的列

希望这能奏效。