Question

我遇到一个问题，这个查询语句让我在结果中重复使用GoalText。有什么想法吗？

完整的查询语句：

Select  g.GoalText, convert(nvarchar, g.GoalID) + '|' + convert(nvarchar, r.GoalReqID) as GoalID, GoalReqID
from Goal g inner join GoalRequirement r
on g.GoalID = r.GoalID 
where GoalReqID in
  (Select GoalReqID
  from GoalRequirement r inner join SurveyAnswer a
   on r.QuestionID = a.QuestionID and  ReqQuestionValue = SurveyAnswer 
   where a.CycleID = 93 and ReqBMILevel is null
  and ReqEnergyBalance is null and SurveyAnswer = 1 and r.QuestionID in
    (Select  QuestionID from Question where QuestionParent = 6000));

结果：

GoalText   GoalID  GoalReqID
Choose lasagna, ravioli, stuffed pasta 1-3 times a week instead of 4 or more times a week.  13|442  442
Choose macaroni and cheese 1-3 times a week instead of 4 or more times a week.  14|443  443
Choose meats in gravies- beef stew, chicken pot pie,… 1-3 times a week instead of 4 or more times a week.   15|444  444
Choose spaghetti, meat sauce and/or meatballs, 1-3 times a week instead of 4 or more times a week.  16|445  445
Choose tacos, burritos, enchiladas, nachos with meat and/or cheese 1-3 times a week instead of 4 or more times a week.  17|446  446
Choose biscuits and sausage gravy 1-3 times a week instead of 4 or more times a week.   102|482 482
Choose pizza- all types and calzones 1-3 times a week instead of 4 or more times a week.    12|483  483
Choose hamburger/tuna/chicken noodle casseroles (includes “Helper”) 1-3 times a week instead of 4 or more times a week. 130|484 484
Choose lasagna, ravioli, stuffed pasta 1-3 times a week instead of 4 or more times a week.  13|485  485
Choose macaroni and cheese 1-3 times a week instead of 4 or more times a week.  14|486  486
Choose meats in gravies- beef stew, chicken pot pie,… 1-3 times a week instead of 4 or more times a week.   15|487  487
Choose spaghetti- marinara sauce only, 1-3 times a week instead of 4 or more times a week.  132|488 488
Choose spaghetti, meat sauce and/or meatballs, 1-3 times a week instead of 4 or more times a week.  16|489  489
Choose tacos, burritos, enchiladas, nachos with meat and/or cheese 1-3 times a week instead of 4 or more times a week.  17|490  490

构成查询的各个查询：

Select  g.GoalText, convert(nvarchar, g.GoalID) + '|' + convert(nvarchar, r.GoalReqID) as GoalID, GoalReqID
from Goal g inner join GoalRequirement r
on g.GoalID = r.GoalID

结果：此查询中有444条记录，但您应该明白这一点。

GoalText   GoalID  GoalReqID
Eat an additional 400-500 calories per day. 1|1 1
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|2 2
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|106   106
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|144   144
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|182   182
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|219   219
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|256   256
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|293   293
Choose fried potatoes, French fries, hash browns, potato salad 1-3 times a week instead of 4 or more times a week.  2|330   330
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|331   331
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|294   294
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|257   257
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|220   220
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|183   183
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|145   145
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|107   107
Choose canned fruit, in heavy syrup, 1-3 times a week instead of 4 or more times a week.    3|3 3
Choose lower fat milk (nonfat, skim, 1%, 2%) instead of whole milk. 4|4 4
Choose lower fat milk (nonfat, skim, 1%, 2%) instead of whole milk. 4|108   108
Choose lower fat milk (nonfat, skim, 1%, 2%) instead of whole milk. 4|146   146
Choose lower fat milk (nonfat, skim, 1%, 2%) instead of whole milk. 4|184   184
Choose lower fat milk (nonfat, skim, 1%, 2%) instead of whole milk. 4|221   221

Select GoalReqID
  from GoalRequirement r inner join SurveyAnswer a
   on r.QuestionID = a.QuestionID and  ReqQuestionValue = SurveyAnswer 
   where a.CycleID = 93 and ReqBMILevel is null
  and ReqEnergyBalance is null and SurveyAnswer = 1

结果：

Select  QuestionID from Question where QuestionParent = 6000

结果：

Answer 1

你正在加入两张桌子。显然，第一个表中的记录与第二个表中的多个记录匹配。发生这种情况时，第一个表中的记录将复制到第二个表中匹配的每个记录的结果集中。

Answer 2

重新编写了您的查询，使其更具可读性，并将subquerys（yuck）变为JOIN：

SELECT g.goaltext
       g.goalid, 
       gr.goalreqid
  FROM GOAL g
  JOIN GOALREQUIREMENT gr ON gr.goalid = g.goalid AND gr.reqbmilevel IS NULL AND gr.reqenergybalance IS NULL
  JOIN JOIN SURVEYANSWER sa ON sa.questionid = gr.questionid AND sa.surveyanswer = gr.reqquestionvalue AND sa.surveyanswer = 1
  JOIN QUESTION q ON q.questionid = gr.questionid
 WHERE sa.cycleid = 93

导致行重复出现的是goalid和/或goalreqid列。因为goaltext列与多个goalid / etcs相关联，所以在包含goalid时，你永远不会获得goaltext的单个条目。

Answer 3

当第一个表中的一行连接到第二个表中的多个行时，您显然只希望它在查询输出中显示一次。在那种情况下，你希望在这个单个输出行显示第二个表中的WHICH行吗？

最后输入的行？
最大的目标是什么？
或其他......

在编写SQL查询以执行答案指定之前，您需要回答此问题。

SQL Query返回重复信息

3 个答案: