我該如何改進這個mysql數據透視查詢？

我正在使用Drupal站點，我需要提交一份Webform提交報告。我該如何改進這個mysql數據透視查詢？

表的結構是這樣的：

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

webform_submitted_data 
- nid 
- sid 
- cid 
- no 
- data

所以，當提交由像這樣進入每個表： 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

有還有另一張將cid映射到f形式的表但我並不擔心這一點。

對於webform_submissions表中與nid匹配的每一行，我需要一行包含webform_submitted_data中的所有相應數據。

result_set NID：100，cid_1：約翰，cid_2：李四

我需要實際的表單數據有大約30場。

這是我已經能夠拿出最好的查詢：

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;

該查詢發生在我的本地MySQL將近20秒拉8條。我只能假設我的方法不是一個好方法。從webform_submitted_data表中獲取與提交相關的所有行到結果集中的單行列中的更好方法是什麼？

FULL QUERY更新了Joins（返回空集）。

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

來源

2016-10-11 Jon Diamond

確保您有webform_submissions（NID，SID），webform_submitted_data（SID，CID）（和美好readiing使用加入符號，而不是在那裏/和條款）

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;

適當的指數例如，該指數

CREATE INDEX ws_id on webform_submissions(nid, sid)

嘗試使用左連接（所以如果一個值不匹配但是查詢工作）

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

來源

2016-10-11 18:13:36 scaisEdge

因此，此查詢適用於2個數據列，但是當我添加全部30個時，它將返回一個空集。 –

顯示完整查詢...所以我可以評估它.. – scaisEdge

我更新了完整查詢的問題。 –

你正在做一個內部連接，它要求記錄存在於所有連接的兩邊。如果任何這些字段不存在，那麼整個記錄將被忽略。您可能需要改爲left join。關於效率，數據庫的基本經驗法則是：在「決策環境」中使用的任何字段，例如，一個where或join，應該有一個索引。

來源

2016-10-11 19:18:53

我該如何改進這個mysql數據透視查詢？

回答

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