sql优化
问题ＳＱＬ！！(开发上观察到的)
SELECT
stock.stockbike_id,
stock.b_s_name_i_n AS b_s_name_i_n,
stock.nenshiki_t_no_n,
stock.soukou_n,
stock.normal_flag,
stock.one_owner_flag,
stock.guarantee_flag,
stock.repair_flag,
stock.b_m_name_n,
stock.b_iro_n,
stock.iro_index,
stock.kakaku,
stock.kakaku_n,
(case when trim(stock.total_price) = '0' then '' else trim(stock.total_price) end) AS total_price,
(case when trim(stock.total_price_n) = '0万円' then '' else trim(stock.total_price_n)end) AS total_price_n,
stock.syaken_n,
stock.haiki_n,
stock.hoken_n,
stock.fukabun_n,
stock.fukabun_n_web,
(
SELECT
trim(movie_name)
FROM
stockbike_movie
WHERE
stockbike_movie.stockbike_id = stock.stockbike_id
) AS movie_name,
(case when stockbike_movie.movie_name IS null then 2 else 1 end ) AS sort_movie,
stock.chatch_n,
stock.ec_flag,
client.client_print_name,
client.address1,
client.phone11,
client.fax1,
client.zip,
stock.pre_n,
area_master.area_name,
stock.area_id ,
stock.subarea_id ,
stock.no_photo_00 ,
stock.options,
stock.kyabu_fi_flag,
stock.suto_flag,
stock.hid_flag,
stock.etc_flag,
stock.boaup_flag,
stock.mt_at_flag,
stock.campaign_flag,
client.shop_mail,
stock.keisai,
REPLACE(REPLACE(b_syasyu.b_s_name_i_r , '＆','_'), '__','_' ) AS syasyu_dir,
REPLACE(REPLACE(b_maker.b_m_name_i_r , '＆','_'), '__','_' ) AS b_m_name_i_r,
stock.client_id AS client_id,
case when stock.soukou_n = '未記入' then '0' when stock.soukou_n = '走不明' then '1' else '2' end || repeat('0', 10-octet_length(regexp_replace(stock.soukou_n, '(,|K)', '','g'))) || regexp_replace(stock.soukou_n, '(,|K)', '','g') AS soukou_sort ,
case when stock.soukou_n = '未記入' then '2' when stock.soukou_n = '—' then '2' when stock.soukou_n = '走不明' then '1' else '0' end AS soukou_sort_new ,
case when stock.nenshiki_t_no_n = '新車' then '2' when stock.nenshiki_t_no_n = '—' then '8' when stock.nenshiki_t_no_n = '年式不明' then '9' else '1' end || repeat('0', 10-octet_length(stock.nenshiki_t_no_n)) || stock.nenshiki_t_no_n AS nenshiki_sort,
case when stock.nenshiki_t_no_n = '—' then '9' when stock.nenshiki_t_no_n = '年式不明' then '8' else '1' end AS nenshiki_sort_new ,
(CASE WHEN stock.kakaku_n = 'ASK' THEN '1' ELSE '0' END) AS kakaku_sort_new,
(CASE WHEN stock.kakaku_n = 'ASK' THEN 999999999 ELSE float4(stock.kakaku) END) AS kakaku_sort,
(CASE WHEN trim(stock.total_price) = '' THEN '1' WHEN trim(stock.total_price)='0' THEN '1' ELSE '0' END) AS total_price_sort_new,
(CASE WHEN length(trim(total_price)) > 0 THEN float4 (stock.total_price) ELSE null END) AS total_price_sort,
(case when new_flag = 2
AND ( trim(total_price) <>''
AND total_price IS NOT null) then '6' when new_flag = 2
AND ( trim(total_price) =''
OR total_price IS null) then '5' when new_flag = 1
AND ( trim(total_price) <>''
AND total_price IS NOT null) then '4' when new_flag = 0
AND ( trim(total_price) <>''
AND total_price IS NOT null) then '3' when new_flag = 1
AND ( trim(total_price) =''
OR total_price IS null) then '2' when new_flag = 0
AND ( trim(total_price) =''
OR total_price IS null) then '1' end) AS total_price_sort_all,
CASE WHEN stock.ec_flag = '1' THEN '1' ELSE '0' END AS ec_sort,
stock.tax_flag ,
stock.m_b_flag AS m_b_stock_flag ,
client.m_b_flag AS m_b_client_flag,
stock.maker_id AS maker_id,
stock.syasyu_id AS syasyu_id,
b_syasyu.genre_ids,
stock.goopon_flag,
b_syasyu.b_s_name_j,
to_char(stock.koushin, 'YYYY-MM-DD') AS koushin,
stock.no_photo_00,
stock.new_flag,
stock.syuuhuku_flag,
stock.seizou_kuni,
j.jititai_name,
(case when matched_appraisal.stockbike_id !='' then 1 else 0 end ) AS jba_stock_flag,
(case when matched_appraisal.stockbike_id !=''
AND stock.new_flag = 2 then 4 when matched_appraisal.stockbike_id !='' then 3 when stock.new_flag = 2 then 2 else 1 end ) AS jba_sort,
matched_appraisal.nearfoot_score,
matched_appraisal.frame_score,
matched_appraisal.engine_score,
matched_appraisal.appearance_score,
extract(year FROM matched_appraisal.appraisal_date)AS appraisal_year,
extract(month FROM matched_appraisal.appraisal_date)AS appraisal_month,
extract(day FROM matched_appraisal.appraisal_date)AS appraisal_day,
matched_appraisal.appraisal_date ,
CASE substring(stock.m_b_flag, 2) WHEN '1' THEN 2 WHEN '2' THEN 2 ELSE 1 END AS mitsumori ,
CASE WHEN stock.no_photo_00 > 1 THEN '1' ELSE '0' END AS no_photo_00_sort
FROM stock
INNER JOIN client ON stock.client_id = client.client_id
INNER JOIN b_syasyu ON stock.syasyu_id = b_syasyu.syasyu_id
INNER JOIN b_maker ON b_syasyu.maker_id = b_maker.maker_id
INNER JOIN area_master ON client.area_id = area_master.area_id
INNER JOIN jititai_area_master j ON client.address_code = j.jititai_id
LEFT JOIN stockbike_movie ON stockbike_movie.stockbike_id = stock.stockbike_id
LEFT JOIN matched_appraisal ON stock.stockbike_id = matched_appraisal.stockbike_id AND matched_appraisal.frame_no = stock.frame_no
WHERE
stock.stockbike_id != ''
ORDER BY
jba_stock_flag DESC ,
total_price_sort_all DESC ,
no_photo_00_sort DESC ,
sort_movie ASC ,
ec_sort DESC ,
mitsumori DESC ,
kakaku_sort_new ASC ,
kakaku_sort DESC ,
nenshiki_sort_new ASC,
nenshiki_sort DESC ,
soukou_sort_new ASC,
soukou_sort ASC ,
stock.up_date DESC
LIMIT 50
OFFSET 0
问题１：
(
SELECT
trim(movie_name)
FROM
stockbike_movie
WHERE
stockbike_movie.stockbike_id = stock.stockbike_id
) AS movie_name,
这个是慢的主因之一。把这个改成
trim(movie_name) movie_name,
SQL可以快一半！！
问题２：
(case when matched_appraisal.stockbike_id !='' then 1 else 0 end ) AS jba_stock_flag,
(case when matched_appraisal.stockbike_id !='' AND stock.new_flag = 2 then 4 when matched_appraisal.stockbike_id !='' then 3 when stock.new_flag = 2 then 2 else 1 end ) AS jba_sort,
其中
matched_appraisal.stockbike_id !=''
这个不可能是FALSE的！！
问题３：
stock.no_photo_00
这个字段被取了两人次。
优化考虑
去掉所有与排序无关的内容后：
SELECT
row_number() over () ordinal,
*
FROM (
SELECT
stock.stockbike_id,
stock.ec_flag,
stock.no_photo_00 ,
(case when stockbike_movie.movie_name IS null then 2 else 1 end ) AS sort_movie,
case when stock.soukou_n = '未記入' then '0' when stock.soukou_n = '走不明' then '1' else '2' end || repeat('0', 10-octet_length(regexp_replace(stock.soukou_n, '(,|K)', '','g'))) || regexp_replace(stock.soukou_n, '(,|K)', '','g') AS soukou_sort ,
case when stock.soukou_n = '未記入' then '2' when stock.soukou_n = '—' then '2' when stock.soukou_n = '走不明' then '1' else '0' end AS soukou_sort_new ,
case when stock.nenshiki_t_no_n = '新車' then '2' when stock.nenshiki_t_no_n = '—' then '8' when stock.nenshiki_t_no_n = '年式不明' then '9' else '1' end || repeat('0', 10-octet_length(stock.nenshiki_t_no_n)) || stock.nenshiki_t_no_n AS nenshiki_sort,
case when stock.nenshiki_t_no_n = '—' then '9' when stock.nenshiki_t_no_n = '年式不明' then '8' else '1' end AS nenshiki_sort_new ,
(CASE WHEN stock.kakaku_n = 'ASK' THEN '1' ELSE '0' END) AS kakaku_sort_new,
(CASE WHEN stock.kakaku_n = 'ASK' THEN 999999999 ELSE float4(stock.kakaku) END) AS kakaku_sort,
(case
when new_flag = 2 AND ( trim(total_price) <>'' AND total_price IS NOT null) then '6'
when new_flag = 2 AND ( trim(total_price) = '' OR total_price IS null) then '5'
when new_flag = 1 AND ( trim(total_price) <>'' AND total_price IS NOT null) then '4'
when new_flag = 0 AND ( trim(total_price) <>'' AND total_price IS NOT null) then '3'
when new_flag = 1 AND ( trim(total_price) = '' OR total_price IS null) then '2'
when new_flag = 0 AND ( trim(total_price) = '' OR total_price IS null) then '1'
end) AS total_price_sort_all,
CASE WHEN stock.ec_flag = '1' THEN '1' ELSE '0' END AS ec_sort,
matched_appraisal.nearfoot_score,
matched_appraisal.frame_score,
matched_appraisal.engine_score,
matched_appraisal.appearance_score,
matched_appraisal.appraisal_date ,
(case when matched_appraisal.stockbike_id !='' then 1 else 0 end ) AS jba_stock_flag,
CASE substring(stock.m_b_flag, 2) WHEN '1' THEN 2 WHEN '2' THEN 2 ELSE 1 END AS mitsumori,
CASE WHEN stock.no_photo_00 > 1 THEN '1' ELSE '0' END AS no_photo_00_sort
FROM stock
LEFT JOIN stockbike_movie ON stockbike_movie.stockbike_id = stock.stockbike_id
LEFT JOIN matched_appraisal ON stock.stockbike_id = matched_appraisal.stockbike_id AND matched_appraisal.frame_no = stock.frame_no
WHERE
stock.stockbike_id != ''
ORDER BY
jba_stock_flag DESC ,
total_price_sort_all DESC ,
no_photo_00_sort DESC ,
sort_movie ASC ,
ec_sort DESC ,
mitsumori DESC ,
kakaku_sort_new ASC ,
kakaku_sort DESC ,
nenshiki_sort_new ASC,
nenshiki_sort DESC ,
soukou_sort_new ASC,
soukou_sort ASC ,
stock.up_date DESC
LIMIT 50
OFFSET 0
) tmpr_search_result_base
;
执行时间对比：
优化前：5233.765 ms
优化后：1255.147 ms
优化解决方案
SELECT
stock.stockbike_id,
stock.b_s_name_i_n AS b_s_name_i_n,
stock.nenshiki_t_no_n,
stock.soukou_n,
stock.normal_flag,
stock.one_owner_flag,
stock.guarantee_flag,
stock.repair_flag,
stock.b_m_name_n,
stock.b_iro_n,
stock.iro_index,
stock.kakaku,
stock.kakaku_n,
(case when trim(stock.total_price) = '0' then '' else trim(stock.total_price) end) AS total_price,
(case when trim(stock.total_price_n) = '0万円' then '' else trim(stock.total_price_n)end) AS total_price_n,
stock.syaken_n,
stock.haiki_n,
stock.hoken_n,
stock.fukabun_n,
stock.fukabun_n_web,
trim(movie_name) AS movie_name,
sort_movie,
stock.chatch_n,
stock.ec_flag,
client.client_print_name,
client.address1,
client.phone11,
client.fax1,
client.zip,
stock.pre_n,
area_master.area_name,
stock.area_id ,
stock.subarea_id ,
stock.no_photo_00 ,
stock.options,
stock.kyabu_fi_flag,
stock.suto_flag,
stock.hid_flag,
stock.etc_flag,
stock.boaup_flag,
stock.mt_at_flag,
stock.campaign_flag,
client.shop_mail,
stock.keisai,
REPLACE(REPLACE(b_syasyu.b_s_name_i_r , '＆','_'), '__','_' ) AS syasyu_dir,
REPLACE(REPLACE(b_maker.b_m_name_i_r , '＆','_'), '__','_' ) AS b_m_name_i_r,
stock.client_id AS client_id,
soukou_sort ,
soukou_sort_new ,
nenshiki_sort,
nenshiki_sort_new ,
kakaku_sort_new,
kakaku_sort,
(CASE WHEN trim(stock.total_price) = '' THEN '1' WHEN trim(stock.total_price)='0' THEN '1' ELSE '0' END) AS total_price_sort_new,
(CASE WHEN length(trim(total_price)) > 0 THEN float4 (stock.total_price) ELSE null END) AS total_price_sort,
total_price_sort_all,
ec_sort,
stock.tax_flag ,
stock.m_b_flag AS m_b_stock_flag ,
client.m_b_flag AS m_b_client_flag,
stock.maker_id AS maker_id,
stock.syasyu_id AS syasyu_id,
b_syasyu.genre_ids,
stock.goopon_flag,
b_syasyu.b_s_name_j,
to_char(stock.koushin, 'YYYY-MM-DD') AS koushin,
stock.no_photo_00,
stock.new_flag,
stock.syuuhuku_flag,
stock.seizou_kuni,
j.jititai_name,
jba_stock_flag,
(case when matched_appraisal.stockbike_id !=''
AND stock.new_flag = 2 then 4 when matched_appraisal.stockbike_id !='' then 3 when stock.new_flag = 2 then 2 else 1 end ) AS jba_sort,
matched_appraisal.nearfoot_score,
matched_appraisal.frame_score,
matched_appraisal.engine_score,
matched_appraisal.appearance_score,
extract(year FROM matched_appraisal.appraisal_date)AS appraisal_year,
extract(month FROM matched_appraisal.appraisal_date)AS appraisal_month,
extract(day FROM matched_appraisal.appraisal_date)AS appraisal_day,
matched_appraisal.appraisal_date ,
mitsumori ,
no_photo_00_sort
FROM (
SELECT
row_number() over () ordinal,
*
FROM (
SELECT
stock.stockbike_id,
stock.ec_flag,
stock.no_photo_00 ,
(case when stockbike_movie.movie_name IS null then 2 else 1 end ) AS sort_movie,
case when stock.soukou_n = '未記入' then '0' when stock.soukou_n = '走不明' then '1' else '2' end || repeat('0', 10-octet_length(regexp_replace(stock.soukou_n, '(,|K)', '','g'))) || regexp_replace(stock.soukou_n, '(,|K)', '','g') AS soukou_sort ,
case when stock.soukou_n = '未記入' then '2' when stock.soukou_n = '—' then '2' when stock.soukou_n = '走不明' then '1' else '0' end AS soukou_sort_new ,
case when stock.nenshiki_t_no_n = '新車' then '2' when stock.nenshiki_t_no_n = '—' then '8' when stock.nenshiki_t_no_n = '年式不明' then '9' else '1' end || repeat('0', 10-octet_length(stock.nenshiki_t_no_n)) || stock.nenshiki_t_no_n AS nenshiki_sort,
case when stock.nenshiki_t_no_n = '—' then '9' when stock.nenshiki_t_no_n = '年式不明' then '8' else '1' end AS nenshiki_sort_new ,
(CASE WHEN stock.kakaku_n = 'ASK' THEN '1' ELSE '0' END) AS kakaku_sort_new,
(CASE WHEN stock.kakaku_n = 'ASK' THEN 999999999 ELSE float4(stock.kakaku) END) AS kakaku_sort,
(case
when new_flag = 2 AND ( trim(total_price) <>'' AND total_price IS NOT null) then '6'
when new_flag = 2 AND ( trim(total_price) = '' OR total_price IS null) then '5'
when new_flag = 1 AND ( trim(total_price) <>'' AND total_price IS NOT null) then '4'
when new_flag = 0 AND ( trim(total_price) <>'' AND total_price IS NOT null) then '3'
when new_flag = 1 AND ( trim(total_price) = '' OR total_price IS null) then '2'
when new_flag = 0 AND ( trim(total_price) = '' OR total_price IS null) then '1'
end) AS total_price_sort_all,
CASE WHEN stock.ec_flag = '1' THEN '1' ELSE '0' END AS ec_sort,
(case when matched_appraisal.stockbike_id !='' then 1 else 0 end ) AS jba_stock_flag,
CASE substring(stock.m_b_flag, 2) WHEN '1' THEN 2 WHEN '2' THEN 2 ELSE 1 END AS mitsumori,
CASE WHEN stock.no_photo_00 > 1 THEN '1' ELSE '0' END AS no_photo_00_sort
FROM stock
LEFT JOIN stockbike_movie ON stockbike_movie.stockbike_id = stock.stockbike_id
LEFT JOIN matched_appraisal ON stock.stockbike_id = matched_appraisal.stockbike_id AND matched_appraisal.frame_no = stock.frame_no
WHERE
stock.stockbike_id != ''
ORDER BY
jba_stock_flag DESC ,
total_price_sort_all DESC ,
no_photo_00_sort DESC ,
sort_movie ASC ,
ec_sort DESC ,
mitsumori DESC ,
kakaku_sort_new ASC ,
kakaku_sort DESC ,
nenshiki_sort_new ASC,
nenshiki_sort DESC ,
soukou_sort_new ASC,
soukou_sort ASC ,
stock.up_date DESC
LIMIT 50
OFFSET 0
) tmpr_search_result_base
) tmpr_search_result_preordered
INNER JOIN stock ON tmpr_search_result_preordered.stockbike_id=stock.stockbike_id
INNER JOIN client ON stock.client_id = client.client_id
INNER JOIN b_syasyu ON stock.syasyu_id = b_syasyu.syasyu_id
INNER JOIN b_maker ON b_syasyu.maker_id = b_maker.maker_id
INNER JOIN area_master ON client.area_id = area_master.area_id
INNER JOIN jititai_area_master j ON client.address_code = j.jititai_id
LEFT JOIN stockbike_movie ON stockbike_movie.stockbike_id = stock.stockbike_id
LEFT JOIN matched_appraisal ON stock.stockbike_id = matched_appraisal.stockbike_id AND matched_appraisal.frame_no = stock.frame_no
ORDER BY
ordinal
;
执行时间：1390.912 ms
提速倍率：3.762829712倍
注意事项
修改文件时不要复制上面的语句。最好再改一遍。
我调试时用的是ＵＴＦ８，转码后可能会有一些转不回ＥＵＣ－ＪＰ的字符。