Is a way to optimize big mysql query? - mysql

Question

This is my query and it's to slow... I'm looking for the way to optimize it.
SELECT p.id,
Group_concat(pc.cat_id) AS groups,
p.code,
p.NAME,
p.price,
p.thumbnail,
p.image,
mc.queries AS merch_queries,
mc.position AS merch_position,
Group_concat(op.image) AS option_images,
cf_RETAIL.value AS custom_RETAIL,
cf_rating.value AS custom_rating,
cf_reviews.value AS custom_reviews,
cf_sku.value AS custom_sku,
cf_brand.value AS custom_brand,
cf_custom_thumbnail.value AS custom_custom_thumbnail
FROM s01_products AS p
LEFT JOIN s01_categoryxproduct AS pc
ON p.id = pc.product_id
LEFT JOIN (SELECT pv.product_id,
pv.value
FROM s01_cfm_prodfields AS pf
INNER JOIN s01_cfm_prodvalues AS pv
ON pf.id = pv.field_id
WHERE pf.code = 'RETAIL') AS cf_RETAIL
ON p.id = cf_RETAIL.product_id
LEFT JOIN (SELECT pv.product_id,
pv.value
FROM s01_cfm_prodfields AS pf
INNER JOIN s01_cfm_prodvalues AS pv
ON pf.id = pv.field_id
WHERE pf.code = 'rating') AS cf_rating
ON p.id = cf_rating.product_id
LEFT JOIN (SELECT pv.product_id,
pv.value
FROM s01_cfm_prodfields AS pf
INNER JOIN s01_cfm_prodvalues AS pv
ON pf.id = pv.field_id
WHERE pf.code = 'reviews') AS cf_reviews
ON p.id = cf_reviews.product_id
LEFT JOIN (SELECT pv.product_id,
pv.value
FROM s01_cfm_prodfields AS pf
INNER JOIN s01_cfm_prodvalues AS pv
ON pf.id = pv.field_id
WHERE pf.code = 'sku') AS cf_sku
ON p.id = cf_sku.product_id
LEFT JOIN (SELECT pv.product_id,
pv.value
FROM s01_cfm_prodfields AS pf
INNER JOIN s01_cfm_prodvalues AS pv
ON pf.id = pv.field_id
WHERE pf.code = 'brand') AS cf_brand
ON p.id = cf_brand.product_id
LEFT JOIN (SELECT pv.product_id,
pv.value
FROM s01_cfm_prodfields AS pf
INNER JOIN s01_cfm_prodvalues AS pv
ON pf.id = pv.field_id
WHERE pf.code = 'custom_thumbnail') AS cf_custom_thumbnail
ON p.id = cf_custom_thumbnail.product_id
LEFT JOIN (SELECT p.product_id AS product_id,
Group_concat(q.query) AS queries,
Min(p.position) AS position
FROM s01_srch_merchandisingproduct AS p
LEFT JOIN s01_srch_merchandisingquery AS q
ON q.id = p.query_id
GROUP BY p.product_id) AS mc
ON p.id = mc.product_id
LEFT JOIN s01_options AS op
ON p.id = op.product_id
AND op.image <> ''
WHERE p.active = 1
GROUP BY p.id
Thanks for any help!
Updated Tables Schema:
**s01_categoryxproduct**
cat_id,
product_id,
disp_order
**s01_products**
id
catcount
agrpcount
pgrpcount
disp_order
code
name
thumbnail
image
price
cost
descrip
weight
taxable
active
sku
cancat_id
page_id
page_title
dt_created
dt_updated
**s01_CFM_ProdValues**
field_id,
product_id,
value,
value_long
**s01_CFM_ProdFields**
id,
code,
name,
group_id,
fieldtype,
info,
facet
**s01_Options**
id,
product_id,
attr_id,
disp_order,
code,
prompt,
price,
cost,
weight,
image
**s01_SRCH_MerchandisingProduct**
id,
product_id,
query_id,
position
**s01_SRCH_MerchandisingQuery**
id,
query

Answer 1

"Over-normalization" and EAV are the problems.
Put prodfields and prodvalues in the same table. Splitting them into two tables leads to performance-eating overhead.
More on optimizing an EAV table: http://mysql.rjweb.org/doc.php/index_cookbook_mysql#speeding_up_wp_postmeta
More discussion of why EAV is bad: http://mysql.rjweb.org/doc.php/eav

Answer 2

SELECT p.id,
Group_concat(pc.cat_id) AS groups,
p.code,
p.NAME,
p.price,
p.thumbnail,
p.image,
mc.queries AS merch_queries,
mc.position AS merch_position,
Group_concat(op.image) AS option_images,
IF(pf.code = 'RETAIL',pv.value , NULL) AS custom_RETAIL,
IF(pf.code = 'rating',pv.value , NULL) AS custom_rating,
IF(pf.code = 'reviews',pv.value , NULL) AS custom_reviews,
IF(pf.code = 'brand',pv.value , NULL) AS custom_brand,
IF(pf.code = 'custom_thumbnail',pv.value , NULL) AS custom_custom_thumbnail,
pvr.value AS custom_rating,
FROM s01_products AS p
LEFT JOIN s01_categoryxproduct AS pc ON p.id = pc.product_id
LEFT JOIN s01_cfm_prodfields AS cf_RETAIL ON p.id = cf_RETAIL.product_id
LEFT JOIN s01_cfm_prodvalues AS pv ON cf_RETAIL.id = pv.field_id
LEFT JOIN (SELECT p.product_id AS product_id,
Group_concat(q.query) AS queries,
Min(p.position) AS position
FROM s01_srch_merchandisingproduct AS p
LEFT JOIN s01_srch_merchandisingquery AS q
ON q.id = p.query_id
GROUP BY p.product_id) AS mc
ON p.id = mc.product_id
LEFT JOIN s01_options AS op
ON p.id = op.product_id
AND op.image <> ''
WHERE p.active = 1
GROUP BY p.id`;