我正在尝试构建一个报告，显示所有产品及其所属的属性、功能和类别。但是我写的查询需要很多时间。我该如何改进呢？
[CODE]
SELECT max(if((ps_attribute_group_lang.name like "Color"),ps_attribute_lang.name,'')) AS Color, max(if((ps_attribute_group_lang.name like "Size"),ps_attribute_lang.name,'')) AS Size, max(if((ps_feature_lang.name like "Brand"),ps_feature_value_lang.value,'')) AS Brand, max(if((ps_feature_lang.name like "Sub brand"),ps_feature_value_lang.value,'')) AS Subbrand, max(if((ps_feature_lang.name like "Occasion"),ps_feature_value_lang.value,'')) AS Occasion, max(if((ps_feature_lang.name like "Sleeves"),ps_feature_value_lang.value,'')) AS Sleeves, max(if((ps_feature_lang.name like "Cuffs"),ps_feature_value_lang.value,'')) AS Cuffs, max(if((ps_feature_lang.name like "Collar"),ps_feature_value_lang.value,'')) AS Collar, max(if((ps_feature_lang.name like "Neck"),ps_feature_value_lang.value,'')) AS Neck, max(if((ps_feature_lang.name like "Hood"),ps_feature_value_lang.value,'')) AS Hood, max(if((ps_feature_lang.name like "Shoulder"),ps_feature_value_lang.value,'')) AS Shoulder, max(if((ps_feature_lang.name like "Straps"),ps_feature_value_lang.value,'')) AS Straps, max(if((ps_feature_lang.name like "Trouser Front"),ps_feature_value_lang.value,'')) AS TrouserFront, max(if((ps_feature_lang.name like "Front Opening"),ps_feature_value_lang.value,'')) AS FrontOpening, max(if((ps_feature_lang.name like "Suit Front"),ps_feature_value_lang.value,'')) AS SuitFront, max(if((ps_feature_lang.name like "Fit"),ps_feature_value_lang.value,'')) AS Fit, max(if((ps_feature_lang.name like "Wash"),ps_feature_value_lang.value,'')) AS Wash, max(if((ps_feature_lang.name like "Length"),ps_feature_value_lang.value,'')) AS Length, max(if((ps_feature_lang.name like "Style"),ps_feature_value_lang.value,'')) AS Style, max(if((ps_feature_lang.name like "Pattern"),ps_feature_value_lang.value,'')) AS Pattern, max(if((ps_feature_lang.name like "Weatherproof"),ps_feature_value_lang.value,'')) AS Weatherproof, max(if((ps_feature_lang.name like "Fabric Type"),ps_feature_value_lang.value,'')) AS FabricType, max(if((ps_feature_lang.name like "Suit Type"),ps_feature_value_lang.value,'')) AS SuitType, max(if((ps_feature_lang.name like "Accessories"),ps_feature_value_lang.value,'')) AS Accessories, max(if((ps_feature_lang.name like "Fashion Accessories"),ps_feature_value_lang.value,'')) AS FashionAccessories, max(if((ps_feature_lang.name like "Shoe Type"),ps_feature_value_lang.value,'')) AS ShoeType, max(if((ps_feature_lang.name like "Bag Type"),ps_feature_value_lang.value,'')) AS BagType, max(if((ps_feature_lang.name like "Material"),ps_feature_value_lang.value,'')) AS Material, max(if((ps_feature_lang.name like "Ethnic Bottom Style "),ps_feature_value_lang.value,'')) AS EthnicBottomStyle, ps_product_attribute.id_product AS productid,
`ps_product_lang`.`name` AS `productname`,
`ps_product_attribute`.`ean13` AS `a_ean13`,
`ps_category_lang`.`name` AS `categoryname`,
`ps_product_attribute`.`id_product_attribute` AS `id_product_attribute`,
`t_vendorproducts`.`a_vendorid` AS `vendorid`,
round(`ps_product`.`price`,2) AS price from
(((((((`ps_product_attribute`
join `ps_product_lang` ON ((`ps_product_lang`.`id_product` = `ps_product_attribute`.`id_product`)))
join `ps_product_attribute_combination` ON ((`ps_product_attribute_combination`.`id_product_attribute` = `ps_product_attribute`.`id_product_attribute`)))
join `ps_attribute` ON ((`ps_attribute`.`id_attribute` = `ps_product_attribute_combination`.`id_attribute`)))
join `ps_attribute_lang` ON ((`ps_attribute_lang`.`id_attribute` = `ps_product_attribute_combination`.`id_attribute`)))
join `ps_attribute_group_lang` ON (((`ps_attribute`.`id_attribute_group` = `ps_attribute_group_lang`.`id_attribute_group`))))))
join ps_feature_product on ps_feature_product.id_product = ps_product_attribute.id_product
join ps_feature_value_lang on ps_feature_value_lang.id_feature_value = ps_feature_product.id_feature_value
join ps_feature_lang on ps_feature_product.id_feature = ps_feature_lang.id_feature
join ps_product on ps_product.id_product = ps_product_attribute.id_product
join ps_category cate1 on cate1.id_category = ps_product.id_category_default
join ps_category cate2 on cate2.id_category = cate1.id_parent
join ps_category_lang on ps_category_lang.id_category = cate1.id_category
WHERE ps_product_lang.id_shop = 1 GROUP BY ps_product_attribute.ean13 ORDER BY productid
[/CODE]
这是解释的内容
"id" "select_type" "table" "type" "possible_keys" "key" "key_len" "ref" "rows" "Extra"
"1" "SIMPLE" "ps_product" "index" "PRIMARY" "id_category_default" "5" \N "5481" "Using index; Using temporary; Using filesort"
"1" "SIMPLE" "pa" "ref" "product_attribute_product,product_default" "product_attribute_product" "4" "mycode.ps_product.id_product" "2" "Using index"
"1" "SIMPLE" "pac" "ref" "id_product_attribute" "id_product_attribute" "4" "mycode.pa.id_product_attribute" "1" "Using index"
"1" "SIMPLE" "a" "eq_ref" "PRIMARY" "PRIMARY" "4" "mycode.pac.id_attribute" "1" ""
"1" "SIMPLE" "ag" "eq_ref" "PRIMARY" "PRIMARY" "4" "mycode.a.id_attribute_group" "1" "Using index"
"1" "SIMPLE" "al" "eq_ref" "PRIMARY,id_lang" "PRIMARY" "8" "mycode.a.id_attribute,const" "1" ""
"1" "SIMPLE" "agl" "eq_ref" "PRIMARY" "PRIMARY" "8" "mycode.ag.id_attribute_group,const" "1" ""
"1" "SIMPLE" "ps_feature_product" "ref" "id_product" "id_product" "4" "mycode.pa.id_product" "1" ""
"1" "SIMPLE" "ps_feature_value_lang" "eq_ref" "PRIMARY,ps_feature_value_lang_lang" "PRIMARY" "8" "mycode.ps_feature_product.id_feature_value,const" "1" ""
"1" "SIMPLE" "ps_feature_lang" "eq_ref" "PRIMARY,id_lang" "PRIMARY" "8" "mycode.ps_feature_product.id_feature,const" "1" ""
"1" "SIMPLE" "cate1" "eq_ref" "PRIMARY" "PRIMARY" "4" "mycode.ps_product.id_category_default" "1" ""
"1" "SIMPLE" "cate2" "eq_ref" "PRIMARY" "PRIMARY" "4" "mycode.cate1.id_parent" "1" "Using index"
"1" "SIMPLE" "ps_category_lang" "ref" "PRIMARY,ps_category_lang_ID_CATEGORY" "ps_category_lang_ID_CATEGORY" "4" "mycode.cate1.id_category" "2" "Using index"
"1" "SIMPLE" "ps_product_lang" "ref" "PRIMARY" "PRIMARY" "4" "mycode.ps_product.id_product" "3" "Using index"