left-join

问题 Assume tables TableA TableB TableC and TableD : Is the following query: TableA INNER JOIN TableB LEFT JOIN TableC LEFT JOIN TableD (all joined to an id column) equivalent to: TableA INNER JOIN TableB INNER JOIN TableC LEFT JOIN TableD UNION TableA INNER JOIN TableB LEFT JOIN TableC ON TableB.c_id IS NULL LEFT JOIN TableD ? Note: Or instead of union just do TableA INNER JOIN TableB INNER JOIN TableC LEFT JOIN TableD And then TableA INNER JOIN TableB LEFT JOIN TableC ON TableB.c_id IS NULL LEFT

问题 I am confused about this Hibernate generated Oracle Sql. There is one user in the database, but they don't have any badges, but I am doing a left outer join on everything. So the user should come back everytime, regardless of them having a badge. If I remove these lines, then it pulls back the user. Isn't left outer join suppose to bring someone back no matter what? AND b4_.ACTIVE=1 AND B4_.STATUS='A' AND UB2_.VISIBLE=1 and bl3_.ACTIVE=1 Hibernate Sql Ran In Sql Developer select this_.ID as

问题 I have 2 tables as below. BILLING AccountId RatingDate Load 1280582 2018-01-04 15:20:13.000 130.000 421947 2018-01-04 11:44:58.000 176.000 1033717 2018-01-04 10:52:23.000 234.000 RATING AccountId RatingDate RatingMethod 1280582 2018-01-04 15:20:13.000 A 421947 2018-01-04 11:44:58.000 A 1033717 2018-01-04 10:52:23.000 A I need to create a measure in Billing table to calculate the sum of Load column. I have the SQL query to perform the same but I am not able to create the measure with the same

问题 Is it possible to do a CROSS JOIN between 2 tables, followed by a LEFT JOIN on to a 3rd table, followed by possibly more left joins? I am using SQL Server 2000/2005. I am running the following query, which is pretty straightForward IMO, but I am getting an error. select P.PeriodID, P.PeriodQuarter, P.PeriodYear, M.Name, M.AuditTypeId, A.AuditId from Period P, Member M LEFT JOIN Audits A ON P.PeriodId = A.PeriodId WHERE P.PeriodID > 29 AND P.PeriodID < 38 AND M.AuditTypeId in (1,2,3,4) order

问题 I'm using the query suggested in this post https://stackoverflow.com/a/51816820/6822845 to list my table contents. This is working really fine, I get a list of every section with its subsections comma seperated in another column so I can explode it and convert it to an array. My problem is, that my sections table(mentioned under my other post linked above) has another column named "sorder" that holds the displaying order. I don't know why, but I'm not able to output it with the column selects

问题 I have two tables, customers and sales. I want to count sales for each customer and create a table of sales per month for each store. I would like to produce something like; ------------------------------ month | customers | sales | ------------------------------ 1/2013 | 5 | 2 | 2/2013 | 21 | 9 | 3/2013 | 14 | 4 | 4/2013 | 9 | 3 | but I am having trouble getting the sales count to be correct when using the following; SELECT CONCAT(MONTH(c.added), '/', YEAR(c.added)), count(c.id), count(s.id)

问题 I'm using the query below: use Doctrine\ORM\Query\Expr\Join; $query = $this->createQueryBuilder('ad') ->select('ad.id, ad.title, ad.year, ad.hours, ad.status') ->addSelect('rem.remark') ->leftJoin('ad.remark', 'rem', Join::WITH, "rem.language = 'NL'") ->getQuery() ->getResult(); This query is working fine and returns the remark of a ad in the Dutch language. The ad has a one-to-many relation with its remark. Only I also have ads that have for example an English remark and not a Dutch one. The

问题 I have 2 tables where tableA has 41 rows and tableB has 3 rows I am trying to get the total rows of these 2 tables via a query using left join but i get way more rows(123) than expected(44) query: SELECT COUNT(*) FROM tableA as u LEFT JOIN tableB as d ON u.uid=d.uid WHERE u.uid=912391178669 AND u.deleted = 0 AND d.deleted=0 tables schema: tableA id | uid | deleted tableB id | uid | deleted 回答1: I have run the following query It is working correctly.. U can check it out. SELECT ( SELECT count(

问题 I need to make a query but get the value in every field empty. Gordon Linoff give me the clue to this need here: SQL Empty query results which is: select t.* from (select 1 as val ) v left outer join table t on 1 = 0; This query wors perfectly on PostgreSQL but gets an error when trying to execute it in Microsoft Access, it says that 1 = 0 expression is not admitted. How could it be fixed to work on microsoft access? Regards, 回答1: If the table has a numeric primary key column whose values are

问题 I have two tables: person id name car name person_id Currently the query goes like: SELECT person.name car.name FROM person, car WHERE person.id = car.person_id Now this works fine if there is a car associated with a person. However if there isn't, then the person won't get returned. If a person has no car, I want to return a row with the text 'No Car' in column car.name . 回答1: select person.name, coalesce(car.name, 'no car') from person left outer join car on person.id = car.person_id 回答2: