好的，我正在用这个拔头发。
我有一个名为products_bind_variant的表
itemId int(10)
productId int(10)
variantId int(10)
variantId引用一种类型，例如大小，颜色等。
此表是变体
variantId int(10)
name varchar(150)
grouping varchar(150)
分组值应为“大小”，“颜色”，“范围”等
我的可变table数据在这里：
|1|Small|Size
|2|Medium|Size
|3|Large|Size
|4|Red|Colour
|5|White|Colour
|6|Blue|Colour
|7|Extra Large|Size
|8|1-3 years|Range
|9|3-10|Range
我的products_bind_variant数据在这里：
|1|69|5
|7|69|6
|8|69|8
|9|69|9
|10|69|4
|12|69|1
|18|69|3
|19|69|2
|20|69|7
我想查询自身的VariantId组合，只显示同一组组合的ID。
我尝试使用
SELECT a.productsid,
a.variantid,
b.variantid
FROM products_bind_variant a
INNER JOIN products_bind_variant b
ON a.variantid < b.variantid
但是，由于它与自身匹配，因此返回36个结果。我需要考虑到仅在分组类型之间找到组合，即24种组合。
基本上，这类似于查询ID。
所以
69| 1,4,8（红色，1-3年小）
这里是我需要生成的组合，但没有名称，variantId
Blue, 1-3 Years, Extra Large
Blue, 3-10 Years, Extra Large
Blue, 1-3 Years, Large
Blue, 3-10 Years, Large
Blue, 1-3 Years, Medium
Blue, 3-10 Years, Medium
Blue, 1-3 Years, Small
Blue, 3-10 Years, Small
Red, 1-3 Years, Extra Large
Red, 3-10 Years, Extra Large
Red, 1-3 Years, Large
Red, 3-10 Years, Large
Red, 1-3 Years, Medium
Red, 3-10 Years, Medium
Red, 1-3 Years, Small
Red, 3-10 Years, Small
White, 1-3 Years, Extra Large
White, 3-10 Years, Extra Large
White, 1-3 Years, Large
White, 3-10 Years, Large
White, 1-3 Years, Medium
White, 3-10 Years, Medium
White, 1-3 Years, Small
White, 3-10 Years, Small
任何帮助将不胜感激。
答案 0 :(得分：0)
如果我的理解正确，那么您想要产品的每个分组的所有变体。如果是这样，请考虑聚合而不是JOIN：
SELECT v.grouping,
pbv.productsid,
grouup_concat(pbv.variantid) as variants
FROM products_bind_variant pbv JOIN
variant v
ON pvb1.variantid = v1.variantid
GROUP BY v.grouping;
答案 1 :(得分：0)
这将产生24行：
`export class ApplicationComponent implements OnInit {
applicationForm: FormGroup;
constructor(private fb: FormBuilder, private route:Router, private activRoute:ActivatedRoute,
private _ser: ApiServiceService) {
this.applicationForm = this.fb.group({
//Application
"IsNew": ['1'],
"StudentID": ['', Validators.required,],
"StudInfoID": [''],
"UniversityID": [''], // ?
"UniversityName": [''], // ?
"CountryCode": [''], // ?
"DateOfApplication": ['', Validators.required,],
"FirstName": [''],
"MiddleName": [''], // default null
"LastName": [''],
"ApplicationStatusID": [''], // ?
"Gender": [''],
"DateOfBirth": [''],
//personal Details
"PlaceOfBirth": [''],
//Contact Details
"EmailID": [''],
"Handphone": [''],
"Telephone": [''],
"EmergencyContactName": [''],
"EmergencyContactRelationShip": [''],
"EmergencyContactTelephone": [''],
//Address Details
//Permanant Address
"PermanentAddressCountryCode": [''],
"permanentAddressState": [''],
"PermanentAddressCity": [''],
"PermanentAddress": [''],
"PermanentAddressPostalCode": [''],
//Mailing Address
"MailingAddressCountryCode": [''],
"MailingAddressState": [''],
"MailingAddressCity": [''],
"MailingAddress": [''],
"MailingAddressPostalCode": [''],
//Passport Details
"PassportNumber": [''],
"PassportIssueDate": [''],
"PassportExpiryDate": [''],
//Parent Details
//Father Details
"FatherFullName": [''],
"FatherCitizenShip": [''],
"FatherOccupation": [''],
"FatherAddress": [''],
"FatherPostalCode": [''],
"FatherOfficeTelephone": [''],
"FatherHomeTelephone": [''],
"FatherHandPhone": [''],
"FatherFaxNumber": [''],
"FatherEmail": [''],
//Mother Details
"MotherFullName": [''],
"MotherCitizenShip": [''],
"MotherOccupation": [''],
"MotherAddress": [''],
"MotherPostalCode": [''],
"MotherOfficeTelephone": [''],
"MotherHomeTelephone": [''],
"MotherHandPhone": [''],
"MotherFaxNumber": [''],
"MotherEmail": [''],
//Guardian Details
"GuardianFullName": [''],
"GuardianCitizenShip": [''],
"GuardianOccupation": [''],
"GuardianAddress": [''],
"GuardianPostalCode": [''],
"GuardianOfficeTelephone": [''],
"GuardianHomeTelephone": [''],
"GuardianHandPhone": [''],
"GuardianFaxNumber": [''],
"GuardianEmail": [''],
//security questions
"FirstSchoolName": [''],
"MotherMedianName": [''],
"FavoriteFood": [''],
"FavoriteHoliday": [''],
//medical disability needs
"ChkmedicalconditionwhichmayaffectyourstudiesYes": [''],
"ChkmedicalconditionwhichmayaffectyourstudiesNo": [''],
"ChkHearing": [''],
"ChkMedical": [''],
"ChkVision": [''],
"ChkMobility": [''],
"ChkOther": [''],
"Other": [''],
"ChkWhatCICY": [''],
"ChkWhatCICN": [''],
//other Info
"NationalServiceStatus": [''],
"ORDDate": [''],
"ExemptedReason": [''],
"SpecialSkill": [''],
"SpecialSkillExplain": [''],
"ArrestedByPolice": [''],
"ArrestedBypoliceExplain": [''],
"DismissedFromEmployment": [''],
"DismissedFromEmploymentExplain": [''],
"MedicalCondition": [''],
"MedicalConditionExplain": [''],
"SubjectToSanction": [''],
"SubjectToSanctionExplain": [''],
"KnowAtSunrice": [''],
"Source": [''],
//co-curricular activities
"DetailsOfECAMemberShip": [''],
//English Language Proficiency
"ChkEngLangFirstLanguageYes": [''],
"ChkEngLangFirstLanguageNo": [''],
"ChkIELTS": [''],
"ChkTofel": [''],
"ChkCute": [''],
"ChkOtherEngLang": [''],
"ChkGCEO": [''],
"EngScoreGrade": [''],
//sponsor details
"ChktutionfeePaidByOrganisationY": [''],
"ChktutionfeePaidByOrganisationN": [''],
"OrganisationName": [''],
"Status": [''],
//Documents Required
"ChkSPM": [''],
"ChkALevelResult": [''],
"ChkALevelCert": [''],
"ChkDegreeResult": [''],
"ChkDegreeCert": [''],
"ChkPassportCopy": [''],
"ChkReferenceLetter": [''],
"ChkPersonalStatement": [''],
"ChkIELTSResult": [''],
"ChkCV": [''],
"ChkPortfolio": [''],
"ChkchkOthers": [''],
// '?'
"DocumentsOthers": [''],
"CreatedBy": [''],
"UpdatedBy": [''],
"CreatedDate": [''],
"ModifiedDate": [''],
"ApplicationNumber": [''],
//new field 'parent-details'
"fathersector": [''],
"Mothersector": [''],
"Gardiansector": [''],
//for counselor '?'
"EmpCode": [''],
"Counsellor": ['',
[Validators.required,]],
"CounsellorMobileNo": [''],
//Children Details
"FullName1": [''],
"Ctizenship1": [''],
"sex1": [''],
"DateOfBirth1": [''],
"countryofBirth1": [''],
"placeofbirth1": [''],
"FullName2": [''],
"Ctizenship2": [''],
"sex2": [''],
"DateOfBirth2": [''],
"countryofBirth2": [''],
"placeofbirth2": [''],
"FullName3": [''],
"Ctizenship3": [''],
"sex3": [''],
"DateOfBirth3": [''],
"countryofBirth3": [''],
"placeofbirth3": [''],
"FullName4": [''],
"Ctizenship4": [''],
"sex4": [''],
"DateOfBirth4": [''],
"countryofBirth4": [''],
"placeofbirth4": [''],
"FullName5": [''],
"Ctizenship5": [''],
"sex5": [''],
"DateOfBirth5": [''],
"countryofBirth5": [''],
"placeofbirth5": [''],
"FullName6": [''],
"Ctizenship6": [''],
"sex6": [''],
"DateOfBirth6": [''],
"countryofBirth6": [''],
"placeofbirth6": [''],
"Identity": [''],
//Documents for under 18
"chkguardianslip": [''],
"chkhomestay": [''],
"chkapprovedhostelaccomodation": [''],
"chkwelfareform": [''],
"chkCAAW": [''],
"chkform1223": [''],
"chkstudent": [''],
"chkfather": [''],
"chkmother": [''],
"chkcourtletter": [''],
"chkdeceasedletter": [''],
"chkstudbirthcertificate": [''],
"chkoyher1": [''],
"txtother1": [''],
// personal details
"MaillingAddSameAsPermanat": [''],
//Address details
//Application
"IC_No": ['', [Validators.required,]],
"Counsellor2": [''],
"EmpCode2": [''],
"Counsellor3": [''],
"EmpCode3": [''],
// '?'
"RejectedStatusRemarks": ['']
});
}`
变量表中只有9个行是唯一的productid：3种颜色，2种范围和4种尺寸
select
`colour`, `range`, `size`, cid, sid, rid
from (select variantId cid, name `colour` from variant where grouping = 'Colour') c
cross join (select variantId sid, name `size` from variant where grouping = 'Size') s
cross join (select variantId rid, name `range` from variant where grouping = 'Range') r
+----+--------+-----------+-------------+-----+-----+-----+
| | colour | range | size | cid | sid | rid |
+----+--------+-----------+-------------+-----+-----+-----+
| 1 | Red | 1-3 years | Small | 4 | 1 | 8 |
| 2 | White | 1-3 years | Small | 5 | 1 | 8 |
| 3 | Blue | 1-3 years | Small | 6 | 1 | 8 |
| 4 | Red | 1-3 years | Medium | 4 | 2 | 8 |
| 5 | White | 1-3 years | Medium | 5 | 2 | 8 |
| 6 | Blue | 1-3 years | Medium | 6 | 2 | 8 |
| 7 | Red | 1-3 years | Large | 4 | 3 | 8 |
| 8 | White | 1-3 years | Large | 5 | 3 | 8 |
| 9 | Blue | 1-3 years | Large | 6 | 3 | 8 |
| 10 | Red | 1-3 years | Extra Large | 4 | 7 | 8 |
| 11 | White | 1-3 years | Extra Large | 5 | 7 | 8 |
| 12 | Blue | 1-3 years | Extra Large | 6 | 7 | 8 |
| 13 | Red | 3-10 | Small | 4 | 1 | 9 |
| 14 | White | 3-10 | Small | 5 | 1 | 9 |
| 15 | Blue | 3-10 | Small | 6 | 1 | 9 |
| 16 | Red | 3-10 | Medium | 4 | 2 | 9 |
| 17 | White | 3-10 | Medium | 5 | 2 | 9 |
| 18 | Blue | 3-10 | Medium | 6 | 2 | 9 |
| 19 | Red | 3-10 | Large | 4 | 3 | 9 |
| 20 | White | 3-10 | Large | 5 | 3 | 9 |
| 21 | Blue | 3-10 | Large | 6 | 3 | 9 |
| 22 | Red | 3-10 | Extra Large | 4 | 7 | 9 |
| 23 | White | 3-10 | Extra Large | 5 | 7 | 9 |
| 24 | Blue | 3-10 | Extra Large | 6 | 7 | 9 |
+----+--------+-----------+-------------+-----+-----+-----+
使用的数据：
SELECT
b.productid, v.grouping, group_concat(v.name order by v.name separator ',') as variants
FROM products_bind_variant b
inner join variant v on b.variantid = v.variantid
group by b.productid, v.grouping
+----+-----------+----------+--------------------------------+
| | productid | grouping | variants |
+----+-----------+----------+--------------------------------+
| 1 | 69 | Colour | Blue,Red,White |
| 2 | 69 | Range | 1-3 years,3-10 |
| 3 | 69 | Size | Extra Large,Large,Medium,Small |
+----+-----------+----------+--------------------------------+