Question

我是一个自学成才的SQL，我有一些非常慢的代码。我在Tableau中可视化这些数据，我创建的视图变得非常慢，我不得不创建一个表（每天刷新），包含我需要的所有信息。

我认为这种缓慢是由于我在这里所做的大量UNION ALL声明。我这样做是为了转移＆＃34; Pivot＆＃34;数据因此每个问题都不是DB中自己的列，而是每行的属性。

任何人都可以提供一些关于如何重构代码以加快速度的提示吗？任何帮助或批评将不胜感激，谢谢！（下面只是我的代码的一个信息，UNION ALL块的数量继续....

CREATE ALGORITHM=UNDEFINED 
DEFINER=root@localhost 
SQL SECURITY DEFINER 
VIEW view_data435386_xxxxx_MASTER AS


SELECT _data435386_xxxxx_1_job_profile.ID AS ID,
_data435386_xxxxx_1_job_profile.ID AS Comment_Photos_ID,
'Job Profile' AS Impact_Area,
_data435386_xxxxx_1_job_profile.PARENT_RECORD_ID AS PARENT_RECORD_ID,
_data435386_xxxxx_1_job_profile.pjq1 AS PJQ1,
_data435386_xxxxx_1_job_profile.pjq_2 AS PJQ2,
_data435386_xxxxx_1_job_profile.pjq_3 AS PJQ3,
_data435386_xxxxx_1_job_profile.pjq_4 AS PJQ4,
_data435386_xxxxx_1_job_profile.pjq_5 AS PJQ5,
_data435386_xxxxx_1_job_profile.pjq_6 AS PJQ6,
_data435386_xxxxx_1_job_profile.pjq_7 AS PJQ7,
_data435386_xxxxx_1_job_profile.pjq_8 AS PJQ8,
_data435386_xxxxx_1_job_profile.pjq_9 AS PJQ9,
_data435386_xxxxx_1_job_profile.pjq_10 AS PJQ10,
_data435386_xxxxx_main_form.additional_comments AS Additional_Comments,
_data435386_xxxxx_main_form.wr_,
NULL AS Completion_Due_Date,
NULL AS Completion_Due_Date_1443,
NULL AS Training_Needed,
NULL AS Follow_Up_Description,
REPLACE(_data435386_xxxxx_main_form.inspector, '_', ' ') AS Inspector,
REPLACE(_data435386_xxxxx_main_form.crew_leader, '_', ' ') AS Crew_Leader,
_data435386_xxxxx_main_form.date1 AS date1,
REPLACE(_data435386_xxxxx_1_job_profile.district, '_', ' ') AS District,
REPLACE(_data435386_xxxxx_1_job_profile.division, '_', ' ') AS Division,
REPLACE(_data435386_xxxxx_1_job_profile.contractor_inspected, '_', ' ') AS Contractor_Inspected,
301 Sample_Size_Req,
        (CASE
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                38197
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                3734
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                5044
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                55214
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                37742
            ELSE NULL   
        END) AS Population_size,
'1_Job Profile' AS Results,
3438545 AS Parent_Page_ID,
'1.0 Job Profile' AS Task,
'1.0 Job Profile' AS Construction_Activity,
NULL AS Overall_Rating,
CONCAT('https://xxxxx.xxxxx.com/exzact/dataPDF.php?TABLE_NAME=_data435386_xxxxx_main_form&ID=',
                `_data435386_xxxxx_main_form`.`ID`,
                '&PAGE_ID=3438731&USERNAME=xxxxx1&PASSWORD=xxxxx') AS `report_url`
FROM
(_data435386_xxxxx_main_form 
LEFT JOIN _data435386_xxxxx_1_job_profile ON((_data435386_xxxxx_main_form.ID = _data435386_xxxxx_1_job_profile.PARENT_RECORD_ID)))
UNION ALL 


SELECT _data435386_xxxxx_1_job_profile.ID AS ID,
_data435386_xxxxx_1_job_profile.ID AS Comment_Photos_ID,
'Safety' AS Impact_Area,
_data435386_xxxxx_1_job_profile.PARENT_RECORD_ID AS PARENT_RECORD_ID,
_data435386_xxxxx_1_job_profile.pjq1 AS PJQ1,
_data435386_xxxxx_1_job_profile.pjq_2 AS PJQ2,
_data435386_xxxxx_1_job_profile.pjq_3 AS PJQ3,
_data435386_xxxxx_1_job_profile.pjq_4 AS PJQ4,
_data435386_xxxxx_1_job_profile.pjq_5 AS PJQ5,
_data435386_xxxxx_1_job_profile.pjq_6 AS PJQ6,
_data435386_xxxxx_1_job_profile.pjq_7 AS PJQ7,
_data435386_xxxxx_1_job_profile.pjq_8 AS PJQ8,
_data435386_xxxxx_1_job_profile.pjq_9 AS PJQ9,
_data435386_xxxxx_1_job_profile.pjq_10 AS PJQ10,
_data435386_xxxxx_main_form.additional_comments AS Additional_Comments,
_data435386_xxxxx_main_form.wr_,
NULL AS Completion_Due_Date,
NULL AS Completion_Due_Date_1443,
NULL AS Training_Needed,
NULL AS Follow_Up_Description,
REPLACE(_data435386_xxxxx_main_form.inspector, '_', ' ') AS Inspector,
REPLACE(_data435386_xxxxx_main_form.crew_leader, '_', ' ') AS Crew_Leader,
_data435386_xxxxx_main_form.date1 AS date1,
REPLACE(_data435386_xxxxx_1_job_profile.district, '_', ' ') AS District,
REPLACE(_data435386_xxxxx_1_job_profile.division, '_', ' ') AS Division,
REPLACE(_data435386_xxxxx_1_job_profile.contractor_inspected, '_', ' ') AS Contractor_Inspected,
301 Sample_Size_Req,
        (CASE
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                38197
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                3734
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                5044
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                55214
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                37742
            ELSE NULL   
        END) AS Population_size,
21_Uses_proper_ppe AS Results,
3438623 AS Parent_Page_ID,
'2.1 Uses Proper PPE' AS Task,
'2.0 Safety' AS Construction_Activity,
NULL AS Overall_Rating,
CONCAT('https://xxxxx.xxxxx.com/exzact/dataPDF.php?TABLE_NAME=_data435386_xxxxx_main_form&ID=',
                `_data435386_xxxxx_main_form`.`ID`,
                '&PAGE_ID=3438731&USERNAME=xxxxx1&PASSWORD=xxxxx') AS `report_url`
FROM
((_data435386_xxxxx_main_form 
LEFT JOIN view_data435386_xxxxx_2_task_successful ON((_data435386_xxxxx_main_form.ID = view_data435386_xxxxx_2_task_successful.PARENT_RECORD_ID))) 
LEFT JOIN _data435386_xxxxx_1_job_profile ON((_data435386_xxxxx_main_form.ID = _data435386_xxxxx_1_job_profile.PARENT_RECORD_ID)))
WHERE 21_Uses_proper_ppe IS NOT NULL
UNION ALL 





SELECT _data435386_xxxxx_1_job_profile.ID AS ID,
view_data435386_xxxxx_2_task_successful.ID AS Comment_Photos_ID,
'Safety' AS Impact_Area,
_data435386_xxxxx_1_job_profile.PARENT_RECORD_ID AS PARENT_RECORD_ID,
_data435386_xxxxx_1_job_profile.pjq1 AS PJQ1,
_data435386_xxxxx_1_job_profile.pjq_2 AS PJQ2,
_data435386_xxxxx_1_job_profile.pjq_3 AS PJQ3,
_data435386_xxxxx_1_job_profile.pjq_4 AS PJQ4,
_data435386_xxxxx_1_job_profile.pjq_5 AS PJQ5,
_data435386_xxxxx_1_job_profile.pjq_6 AS PJQ6,
_data435386_xxxxx_1_job_profile.pjq_7 AS PJQ7,
_data435386_xxxxx_1_job_profile.pjq_8 AS PJQ8,
_data435386_xxxxx_1_job_profile.pjq_9 AS PJQ9,
_data435386_xxxxx_1_job_profile.pjq_10 AS PJQ10,
_data435386_xxxxx_main_form.additional_comments AS Additional_Comments,
_data435386_xxxxx_main_form.wr_,
NULL AS Completion_Due_Date,
NULL AS Completion_Due_Date_1443,
NULL AS Training_Needed,
NULL AS Follow_Up_Description,
REPLACE(_data435386_xxxxx_main_form.inspector, '_', ' ') AS Inspector,
REPLACE(_data435386_xxxxx_main_form.crew_leader, '_', ' ') AS Crew_Leader,
_data435386_xxxxx_main_form.date1 AS date1,
REPLACE(_data435386_xxxxx_1_job_profile.district, '_', ' ') AS District,
REPLACE(_data435386_xxxxx_1_job_profile.division, '_', ' ') AS Division,
REPLACE(_data435386_xxxxx_1_job_profile.contractor_inspected, '_', ' ') AS Contractor_Inspected,
301 Sample_Size_Req,
        (CASE
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                38197
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                3734
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                5044
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                55214
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                37742
            ELSE NULL   
        END) AS Population_size,
22_Damage_Prevention AS Results,
3438623 AS Parent_Page_ID,
'2.2 Damage Prevention' AS Task,
'2.0 Safety' AS Construction_Activity,
NULL AS Overall_Rating,
CONCAT('https://xxxxx.xxxxx.com/exzact/dataPDF.php?TABLE_NAME=_data435386_xxxxx_main_form&ID=',
                `_data435386_xxxxx_main_form`.`ID`,
                '&PAGE_ID=3438731&USERNAME=xxxxx1&PASSWORD=xxxxx') AS `report_url`
FROM
((_data435386_xxxxx_main_form 
LEFT JOIN view_data435386_xxxxx_2_task_successful ON((_data435386_xxxxx_main_form.ID = view_data435386_xxxxx_2_task_successful.PARENT_RECORD_ID))) 
LEFT JOIN _data435386_xxxxx_1_job_profile ON((_data435386_xxxxx_main_form.ID = _data435386_xxxxx_1_job_profile.PARENT_RECORD_ID)))
WHERE 22_Damage_Prevention IS NOT NULL
UNION ALL 





SELECT _data435386_xxxxx_1_job_profile.ID AS ID,
view_data435386_xxxxx_2_task_successful.ID AS Comment_Photos_ID,
'Safety' AS Impact_Area,
_data435386_xxxxx_1_job_profile.PARENT_RECORD_ID AS PARENT_RECORD_ID,
_data435386_xxxxx_1_job_profile.pjq1 AS PJQ1,
_data435386_xxxxx_1_job_profile.pjq_2 AS PJQ2,
_data435386_xxxxx_1_job_profile.pjq_3 AS PJQ3,
_data435386_xxxxx_1_job_profile.pjq_4 AS PJQ4,
_data435386_xxxxx_1_job_profile.pjq_5 AS PJQ5,
_data435386_xxxxx_1_job_profile.pjq_6 AS PJQ6,
_data435386_xxxxx_1_job_profile.pjq_7 AS PJQ7,
_data435386_xxxxx_1_job_profile.pjq_8 AS PJQ8,
_data435386_xxxxx_1_job_profile.pjq_9 AS PJQ9,
_data435386_xxxxx_1_job_profile.pjq_10 AS PJQ10,
_data435386_xxxxx_main_form.additional_comments AS Additional_Comments,
_data435386_xxxxx_main_form.wr_,
NULL AS Completion_Due_Date,
NULL AS Completion_Due_Date_1443,
NULL AS Training_Needed,
NULL AS Follow_Up_Description,
REPLACE(_data435386_xxxxx_main_form.inspector, '_', ' ') AS Inspector,
REPLACE(_data435386_xxxxx_main_form.crew_leader, '_', ' ') AS Crew_Leader,
_data435386_xxxxx_main_form.date1 AS date1,
REPLACE(_data435386_xxxxx_1_job_profile.district, '_', ' ') AS District,
REPLACE(_data435386_xxxxx_1_job_profile.division, '_', ' ') AS Division,
REPLACE(_data435386_xxxxx_1_job_profile.contractor_inspected, '_', ' ') AS Contractor_Inspected,
301 Sample_Size_Req,
        (CASE
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                38197
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                3734
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                5044
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                55214
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                37742
            ELSE NULL   
        END) AS Population_size,
23_fire_bottle_and_no_smoking_sign AS Results,
3438623 AS Parent_Page_ID,
'2.3 Fire Bottle and No Smoking Sign' AS Task,
'2.0 Safety' AS Construction_Activity,
NULL AS Overall_Rating,
CONCAT('https://xxxxx.xxxxx.com/exzact/dataPDF.php?TABLE_NAME=_data435386_xxxxx_main_form&ID=',
                `_data435386_xxxxx_main_form`.`ID`,
                '&PAGE_ID=3438731&USERNAME=xxxxx1&PASSWORD=xxxxx') AS `report_url`
FROM
((_data435386_xxxxx_main_form 
LEFT JOIN view_data435386_xxxxx_2_task_successful ON((_data435386_xxxxx_main_form.ID = view_data435386_xxxxx_2_task_successful.PARENT_RECORD_ID))) 
LEFT JOIN _data435386_xxxxx_1_job_profile ON((_data435386_xxxxx_main_form.ID = _data435386_xxxxx_1_job_profile.PARENT_RECORD_ID)))
WHERE 23_fire_bottle_and_no_smoking_sign IS NOT NULL
UNION ALL 





SELECT _data435386_xxxxx_1_job_profile.ID AS ID,
view_data435386_xxxxx_2_task_successful.ID AS Comment_Photos_ID,
'Safety' AS Impact_Area,
_data435386_xxxxx_1_job_profile.PARENT_RECORD_ID AS PARENT_RECORD_ID,
_data435386_xxxxx_1_job_profile.pjq1 AS PJQ1,
_data435386_xxxxx_1_job_profile.pjq_2 AS PJQ2,
_data435386_xxxxx_1_job_profile.pjq_3 AS PJQ3,
_data435386_xxxxx_1_job_profile.pjq_4 AS PJQ4,
_data435386_xxxxx_1_job_profile.pjq_5 AS PJQ5,
_data435386_xxxxx_1_job_profile.pjq_6 AS PJQ6,
_data435386_xxxxx_1_job_profile.pjq_7 AS PJQ7,
_data435386_xxxxx_1_job_profile.pjq_8 AS PJQ8,
_data435386_xxxxx_1_job_profile.pjq_9 AS PJQ9,
_data435386_xxxxx_1_job_profile.pjq_10 AS PJQ10,
_data435386_xxxxx_main_form.additional_comments AS Additional_Comments,
_data435386_xxxxx_main_form.wr_,
NULL AS Completion_Due_Date,
NULL AS Completion_Due_Date_1443,
NULL AS Training_Needed,
NULL AS Follow_Up_Description,
REPLACE(_data435386_xxxxx_main_form.inspector, '_', ' ') AS Inspector,
REPLACE(_data435386_xxxxx_main_form.crew_leader, '_', ' ') AS Crew_Leader,
_data435386_xxxxx_main_form.date1 AS date1,
REPLACE(_data435386_xxxxx_1_job_profile.district, '_', ' ') AS District,
REPLACE(_data435386_xxxxx_1_job_profile.division, '_', ' ') AS Division,
REPLACE(_data435386_xxxxx_1_job_profile.contractor_inspected, '_', ' ') AS Contractor_Inspected,
NULL Sample_Size_Req,
        (CASE
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                38197
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                3734
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                5044
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                55214
            WHEN
                (_data435386_xxxxx_1_job_profile.division = 'xxxxx')
            THEN
                37742
            ELSE NULL   
        END) AS Population_size,
24_traffic_control_plan AS Results,
3438623 AS Parent_Page_ID,
'2.4 Traffic Control Plan' AS Task,
'2.0 Safety' AS Construction_Activity,
NULL AS Overall_Rating,
CONCAT('https://xxxxx.xxxxx.com/exzact/dataPDF.php?TABLE_NAME=_data435386_xxxxx_main_form&ID=',
                `_data435386_xxxxx_main_form`.`ID`,
                '&PAGE_ID=3438731&USERNAME=xxxxx1&PASSWORD=xxxxx') AS `report_url`
FROM
((_data435386_xxxxx_main_form 
LEFT JOIN view_data435386_xxxxx_2_task_successful ON((_data435386_xxxxx_main_form.ID = view_data435386_xxxxx_2_task_successful.PARENT_RECORD_ID))) 
LEFT JOIN _data435386_xxxxx_1_job_profile ON((_data435386_xxxxx_main_form.ID = _data435386_xxxxx_1_job_profile.PARENT_RECORD_ID)))
WHERE 24_traffic_control_plan IS NOT NULL
UNION ALL

Answer 1

看起来UNIONed的几个查询几乎完全相同，仅用于生成具有不同Results和Task字段的多个结果行;您可能希望查看合并这些查询，或将查询的统一（将Results字段的所有值作为单独的字段）插入到中间（伪临时）表中，然后对此进行UNIONing更简单的查询

“中间（伪临时）”是指你不打算保留的非临时表;我建议使用TEMPORARY表，但MySQL不允许在同一个查询中多次引用（例如UNION或自联接）。

编辑：还不清楚Result值来自哪个表;如果他们不是来自_data435386_xxxxx_main_form，那么你有一些LEFT JOIN可以是INNER JOIN。

膨胀的UNION ALL代码（MYSQL）

1 个答案: