Как я могу улучшить этот опорный запрос mysql?

Question

Я работаю с сайтом Drupal, и мне нужно вывести отчет о представлениях веб-формы.

Структура Таблица такова:

webform_submissions 
- sid 
- nid 
- serial 
- uid 
- is_draft 
- submitted 
- remote_addr 

webform_submitted_data 
- nid 
- sid 
- cid 
- no 
- data 

Так что, когда представление делается что-то вроде этого идет в каждую таблицу: webform_submissions

sid: 1, nid:100, serial: 1, uid: 0, is_draft: 0, submitted: [timestamp], remote_addr: 0.0.0.0 

webform_submitted_data

nid: 100, sid: 1, cid: 1, no: 0, data: John 
nid: 100, sid: 1, cid: 2, no: 0, data: Doe 

Eсть также другая таблица, которая отображает cid в форму f ield, но я не беспокоюсь об этом.

для каждой строки в таблице webform_submissions, соответствующей nid Мне нужна строка со всеми соответствующими данными в файле webform_submitted_data.

result_set нидь: 100, cid_1: Джон, cid_2: Doe

фактические данные формы мне нужно около 30 полей.

Это лучший запрос, я смог придумать:

SELECT ws.nid, wd_c2.data, wd_c3.data 
FROM webform_submissions ws, 
     webform_submitted_data wd_c2, 
     webform_submitted_data wd_c3 
WHERE ws.nid = 168 
AND  ws.sid = wd_c3.sid 
AND  wd_c3.cid = 3 
AND  ws.sid = wd_c2.sid 
AND  wd_c2.cid = 2; 

Этот запрос занимает около 20 секунд на моем локальном MySQL тянуть 8 записей. Я могу только предположить, что мой подход не очень хороший. Что является лучшим способом получить все строки, связанные с представлением из таблицы webform_submitted_data, в одну строку столбцов в моем результирующем наборе.

ПОЛНЫЙ QUERY обновлен с помощью объединений (возвращает пустой набор).

SELECT ws.nid, 
wd_c2.data as 'First Name', 
wd_c3.data as 'Last Name', 
wd_c4.data as 'Email Address', 
wd_c5.data as 'Primary Phone', 
wd_c6.data as 'Secondary Phone', 
wd_c7.data as 'Address', 
wd_c8.data as 'City', 
wd_c9.data as 'State', 
wd_c10.data as 'Zip Code', 
wd_c11.data as 'Cf', 
wd_c12.data as 'AR', 
wd_c13.data as 'G', 
wd_c14.data as 'PE', 
wd_c15.data as 'PD', 
wd_c16.data as 'AN', 
wd_c17.data as 'V', 
wd_c18.data as 'S', 
wd_c19.data as 'V2', 
wd_c20.data as 'S', 
wd_c21.data as 'Si', 
wd_c22.data as 'D', 
wd_c23.data as 'M', 
wd_c24.data as 'L', 
wd_c25.data as 'V', 
wd_c26.data as 'C', 
wd_c27.data as 'O', 
wd_c28.data as 'M', 
wd_c29.data as 'P', 
wd_c30.data as 'C', 
wd_c31.data as 'C', 
wd_c32.data as 'C', 
wd_c33.data as 'E', 
wd_c34.data as 'Ey', 
wd_c41.data as 'TD', 
wd_c42.data as 'RN', 
wd_c43.data as 'TP', 
wd_c45.data as 'LM', 
wd_c47.data as 'PIp', 
wd_c48.data as 'wd', 
wd_c49.data as 'Cr', 
wd_c50.data as 'N', 
wd_c51.data as 'A' 

FROM webform_submissions ws 
INNER JOIN webform_submitted_data wd_c2 on ws.sid = wd_c2.sid 
INNER JOIN webform_submitted_data wd_c3 on ws.sid = wd_c3.sid 
INNER JOIN webform_submitted_data wd_c4 on ws.sid = wd_c4.sid 
INNER JOIN webform_submitted_data wd_c5 on ws.sid = wd_c5.sid 
INNER JOIN webform_submitted_data wd_c6 on ws.sid = wd_c6.sid 
INNER JOIN webform_submitted_data wd_c7 on ws.sid = wd_c7.sid 
INNER JOIN webform_submitted_data wd_c8 on ws.sid = wd_c8.sid 
INNER JOIN webform_submitted_data wd_c9 on ws.sid = wd_c9.sid 
INNER JOIN webform_submitted_data wd_c10 on ws.sid = wd_c10.sid 
INNER JOIN webform_submitted_data wd_c11 on ws.sid = wd_c11.sid 
INNER JOIN webform_submitted_data wd_c12 on ws.sid = wd_c12.sid 
INNER JOIN webform_submitted_data wd_c13 on ws.sid = wd_c13.sid 
INNER JOIN webform_submitted_data wd_c14 on ws.sid = wd_c14.sid 
INNER JOIN webform_submitted_data wd_c15 on ws.sid = wd_c15.sid 
INNER JOIN webform_submitted_data wd_c16 on ws.sid = wd_c16.sid 
INNER JOIN webform_submitted_data wd_c17 on ws.sid = wd_c17.sid 
INNER JOIN webform_submitted_data wd_c18 on ws.sid = wd_c18.sid 
INNER JOIN webform_submitted_data wd_c19 on ws.sid = wd_c19.sid 
INNER JOIN webform_submitted_data wd_c20 on ws.sid = wd_c20.sid 
INNER JOIN webform_submitted_data wd_c21 on ws.sid = wd_c21.sid 
INNER JOIN webform_submitted_data wd_c22 on ws.sid = wd_c22.sid 
INNER JOIN webform_submitted_data wd_c23 on ws.sid = wd_c23.sid 
INNER JOIN webform_submitted_data wd_c24 on ws.sid = wd_c24.sid 
INNER JOIN webform_submitted_data wd_c25 on ws.sid = wd_c25.sid 
INNER JOIN webform_submitted_data wd_c26 on ws.sid = wd_c26.sid 
INNER JOIN webform_submitted_data wd_c27 on ws.sid = wd_c27.sid 
INNER JOIN webform_submitted_data wd_c28 on ws.sid = wd_c28.sid 
INNER JOIN webform_submitted_data wd_c29 on ws.sid = wd_c29.sid 
INNER JOIN webform_submitted_data wd_c30 on ws.sid = wd_c30.sid 
INNER JOIN webform_submitted_data wd_c31 on ws.sid = wd_c31.sid 
INNER JOIN webform_submitted_data wd_c32 on ws.sid = wd_c32.sid 
INNER JOIN webform_submitted_data wd_c33 on ws.sid = wd_c33.sid 
INNER JOIN webform_submitted_data wd_c34 on ws.sid = wd_c34.sid 
INNER JOIN webform_submitted_data wd_c41 on ws.sid = wd_c41.sid 
INNER JOIN webform_submitted_data wd_c42 on ws.sid = wd_c42.sid 
INNER JOIN webform_submitted_data wd_c43 on ws.sid = wd_c43.sid 
INNER JOIN webform_submitted_data wd_c45 on ws.sid = wd_c45.sid 
INNER JOIN webform_submitted_data wd_c47 on ws.sid = wd_c47.sid 
INNER JOIN webform_submitted_data wd_c48 on ws.sid = wd_c48.sid 
INNER JOIN webform_submitted_data wd_c49 on ws.sid = wd_c49.sid 
INNER JOIN webform_submitted_data wd_c50 on ws.sid = wd_c50.sid 
INNER JOIN webform_submitted_data wd_c51 on ws.sid = wd_c51.sid 
INNER JOIN webform_submitted_data wd_c52 on ws.sid = wd_c52.sid 

WHERE ws.nid = 16818 

AND  wd_c2.cid = 2 
AND  wd_c3.cid = 3 
AND  wd_c4.cid = 4 
AND  wd_c5.cid = 5 
AND  wd_c6.cid = 6 
AND  wd_c7.cid = 7 
AND  wd_c8.cid = 8 
AND  wd_c9.cid = 9 
AND  wd_c10.cid = 10 
AND  wd_c11.cid = 11 
AND  wd_c12.cid = 12 
AND  wd_c13.cid = 13 
AND  wd_c14.cid = 14 
AND  wd_c15.cid = 15 
AND  wd_c16.cid = 16 
AND  wd_c17.cid = 17 
AND  wd_c18.cid = 18 
AND  wd_c19.cid = 19 
AND  wd_c20.cid = 20 
AND  wd_c21.cid = 21 
AND  wd_c22.cid = 22 
AND  wd_c23.cid = 23 
AND  wd_c24.cid = 24 
AND  wd_c25.cid = 25 
AND  wd_c26.cid = 26 
AND  wd_c27.cid = 27 
AND  wd_c28.cid = 28 
AND  wd_c29.cid = 29 
AND  wd_c30.cid = 30 
AND  wd_c31.cid = 31 
AND  wd_c32.cid = 32 
AND  wd_c33.cid = 33 
AND  wd_c34.cid = 34 
AND  wd_c41.cid = 41 
AND  wd_c42.cid = 42 
AND  wd_c43.cid = 43 
AND  wd_c45.cid = 45 
AND  wd_c47.cid = 47 
AND  wd_c48.cid = 48 
AND  wd_c49.cid = 49 
AND  wd_c50.cid = 50 
AND  wd_c51.cid = 51 
AND  wd_c52.cid = 52 
LIMIT 20 

Answer 1

Убедитесь, что у вас есть надлежащий индекс webform_submissions (НДИ, SID), webform_submitted_data (с.и.д., CID) (и для лучшего использования readiing присоединиться обозначениями вместо того, где/и п)

SELECT ws.nid, wd_c2.data, wd_c3.data 
    FROM  webform_submissions ws 
    INNER JOIN webform_submitted_data wd_c2 on ws.sid = wd_c2.sid 
    INNER JOIN webform_submitted_data wd_c3 on ws.sid = wd_c3.sid 
    WHERE ws.nid = 168 
    AND  wd_c3.cid = 3 
    AND  wd_c2.cid = 2; 

например, для индекса

CREATE INDEX ws_id on webform_submissions(nid, sid) 

попытаться использовать левое соединение (так что если значение не соответствует работе запросов, однако)

SELECT ws.nid, 
wd_c2.data as 'First Name', 
wd_c3.data as 'Last Name', 
wd_c4.data as 'Email Address', 
wd_c5.data as 'Primary Phone', 
wd_c6.data as 'Secondary Phone', 
wd_c7.data as 'Address', 
wd_c8.data as 'City', 
wd_c9.data as 'State', 
wd_c10.data as 'Zip Code', 
wd_c11.data as 'Cf', 
wd_c12.data as 'AR', 
wd_c13.data as 'G', 
wd_c14.data as 'PE', 
wd_c15.data as 'PD', 
wd_c16.data as 'AN', 
wd_c17.data as 'V', 
wd_c18.data as 'S', 
wd_c19.data as 'V2', 
wd_c20.data as 'S', 
wd_c21.data as 'Si', 
wd_c22.data as 'D', 
wd_c23.data as 'M', 
wd_c24.data as 'L', 
wd_c25.data as 'V', 
wd_c26.data as 'C', 
wd_c27.data as 'O', 
wd_c28.data as 'M', 
wd_c29.data as 'P', 
wd_c30.data as 'C', 
wd_c31.data as 'C', 
wd_c32.data as 'C', 
wd_c33.data as 'E', 
wd_c34.data as 'Ey', 
wd_c41.data as 'TD', 
wd_c42.data as 'RN', 
wd_c43.data as 'TP', 
wd_c45.data as 'LM', 
wd_c47.data as 'PIp', 
wd_c48.data as 'wd', 
wd_c49.data as 'Cr', 
wd_c50.data as 'N', 
wd_c51.data as 'A' 

FROM webform_submissions ws 
LEFT JOIN webform_submitted_data wd_c2 on ws.sid = wd_c2.sid 
LEFT JOIN webform_submitted_data wd_c3 on ws.sid = wd_c3.sid 
LEFT JOIN webform_submitted_data wd_c4 on ws.sid = wd_c4.sid 
LEFT JOIN webform_submitted_data wd_c5 on ws.sid = wd_c5.sid 
LEFT JOIN webform_submitted_data wd_c6 on ws.sid = wd_c6.sid 
LEFT JOIN webform_submitted_data wd_c7 on ws.sid = wd_c7.sid 
LEFT JOIN webform_submitted_data wd_c8 on ws.sid = wd_c8.sid 
LEFT JOIN webform_submitted_data wd_c9 on ws.sid = wd_c9.sid 
LEFT JOIN webform_submitted_data wd_c10 on ws.sid = wd_c10.sid 
LEFT JOIN webform_submitted_data wd_c11 on ws.sid = wd_c11.sid 
LEFT JOIN webform_submitted_data wd_c12 on ws.sid = wd_c12.sid 
LEFT JOIN webform_submitted_data wd_c13 on ws.sid = wd_c13.sid 
LEFT JOIN webform_submitted_data wd_c14 on ws.sid = wd_c14.sid 
LEFT JOIN webform_submitted_data wd_c15 on ws.sid = wd_c15.sid 
LEFT JOIN webform_submitted_data wd_c16 on ws.sid = wd_c16.sid 
LEFT JOIN webform_submitted_data wd_c17 on ws.sid = wd_c17.sid 
LEFT JOIN webform_submitted_data wd_c18 on ws.sid = wd_c18.sid 
LEFT JOIN webform_submitted_data wd_c19 on ws.sid = wd_c19.sid 
LEFT JOIN webform_submitted_data wd_c20 on ws.sid = wd_c20.sid 
LEFT JOIN webform_submitted_data wd_c21 on ws.sid = wd_c21.sid 
LEFT JOIN webform_submitted_data wd_c22 on ws.sid = wd_c22.sid 
LEFT JOIN webform_submitted_data wd_c23 on ws.sid = wd_c23.sid 
LEFT JOIN webform_submitted_data wd_c24 on ws.sid = wd_c24.sid 
LEFT JOIN webform_submitted_data wd_c25 on ws.sid = wd_c25.sid 
LEFT JOIN webform_submitted_data wd_c26 on ws.sid = wd_c26.sid 
LEFT JOIN webform_submitted_data wd_c27 on ws.sid = wd_c27.sid 
LEFT JOIN webform_submitted_data wd_c28 on ws.sid = wd_c28.sid 
LEFT JOIN webform_submitted_data wd_c29 on ws.sid = wd_c29.sid 
LEFT JOIN webform_submitted_data wd_c30 on ws.sid = wd_c30.sid 
LEFT JOIN webform_submitted_data wd_c31 on ws.sid = wd_c31.sid 
LEFT JOIN webform_submitted_data wd_c32 on ws.sid = wd_c32.sid 
LEFT JOIN webform_submitted_data wd_c33 on ws.sid = wd_c33.sid 
LEFT JOIN webform_submitted_data wd_c34 on ws.sid = wd_c34.sid 
LEFT JOIN webform_submitted_data wd_c41 on ws.sid = wd_c41.sid 
LEFT JOIN webform_submitted_data wd_c42 on ws.sid = wd_c42.sid 
LEFT JOIN webform_submitted_data wd_c43 on ws.sid = wd_c43.sid 
LEFT JOIN webform_submitted_data wd_c45 on ws.sid = wd_c45.sid 
LEFT JOIN webform_submitted_data wd_c47 on ws.sid = wd_c47.sid 
LEFT JOIN webform_submitted_data wd_c48 on ws.sid = wd_c48.sid 
LEFT JOIN webform_submitted_data wd_c49 on ws.sid = wd_c49.sid 
LEFT JOIN webform_submitted_data wd_c50 on ws.sid = wd_c50.sid 
LEFT JOIN webform_submitted_data wd_c51 on ws.sid = wd_c51.sid 
LEFT JOIN webform_submitted_data wd_c52 on ws.sid = wd_c52.sid 

WHERE ws.nid = 16818 

AND  wd_c2.cid = 2 
AND  wd_c3.cid = 3 
AND  wd_c4.cid = 4 
AND  wd_c5.cid = 5 
AND  wd_c6.cid = 6 
AND  wd_c7.cid = 7 
AND  wd_c8.cid = 8 
AND  wd_c9.cid = 9 
AND  wd_c10.cid = 10 
AND  wd_c11.cid = 11 
AND  wd_c12.cid = 12 
AND  wd_c13.cid = 13 
AND  wd_c14.cid = 14 
AND  wd_c15.cid = 15 
AND  wd_c16.cid = 16 
AND  wd_c17.cid = 17 
AND  wd_c18.cid = 18 
AND  wd_c19.cid = 19 
AND  wd_c20.cid = 20 
AND  wd_c21.cid = 21 
AND  wd_c22.cid = 22 
AND  wd_c23.cid = 23 
AND  wd_c24.cid = 24 
AND  wd_c25.cid = 25 
AND  wd_c26.cid = 26 
AND  wd_c27.cid = 27 
AND  wd_c28.cid = 28 
AND  wd_c29.cid = 29 
AND  wd_c30.cid = 30 
AND  wd_c31.cid = 31 
AND  wd_c32.cid = 32 
AND  wd_c33.cid = 33 
AND  wd_c34.cid = 34 
AND  wd_c41.cid = 41 
AND  wd_c42.cid = 42 
AND  wd_c43.cid = 43 
AND  wd_c45.cid = 45 
AND  wd_c47.cid = 47 
AND  wd_c48.cid = 48 
AND  wd_c49.cid = 49 
AND  wd_c50.cid = 50 
AND  wd_c51.cid = 51 
AND  wd_c52.cid = 52 
LIMIT 20 

Answer 2

Вы выполняете внутреннее соединение, которое требует наличия записей на обеих сторонах ВСЕХ объединений. Если какое-либо из этих полей не существует, то вся запись игнорируется. Вероятно, вы, скорее всего, захотите left join.

Что касается эффективности, основное правило для баз данных: любое поле, используемое в «контексте решения», например. a where или join, должен иметь индекс на нем.