inner-join

问题 I'm trying to learn how to use an sqlite database in a java program. (not Android). I went to this link, download the jdbc library and copied the example. The example worked without errors. I then added another table to the database and the wanted to join both tables and select once column from each. I get an error on the line that makes the query from the database no such column: 'person.name' . I've tried many different ways to join the tables and select, but every time I get an exception

问题 This question already has answers here : Simulating Cross Context Joins--LINQ/C# (3 answers) Closed 4 years ago . I have two tables from two different Data Contexts. Although both tables are from the same database, two separate datacontexts exist. Error message: The query contains references to items defined on a different data context. How can I get around this? Any help is appreciated. Thanks. 回答1: Oh Stackoverflow how you provide!! Simulating Cross Context Joins--LINQ/C# 回答2: If your code

问题 I seem to be having some difficulty with a query in hibernate. I am performing an inner join on two tables. SELECT * FROM product p INNER JOIN warehouse w ON p.wid = w.id Product Table: id | name | wid | price | stock ..... Warehouse Table: id | name | city | lat | long ..... The join result: id | name | wid | price | stock | id | name | city | lat | long ..... When I run the query.. Session.createSQLQuery(this.query) .addEntity("p", Product.class) .addEntity("w", Warehouse.class).list(); So

问题 I seem to be having some difficulty with a query in hibernate. I am performing an inner join on two tables. SELECT * FROM product p INNER JOIN warehouse w ON p.wid = w.id Product Table: id | name | wid | price | stock ..... Warehouse Table: id | name | city | lat | long ..... The join result: id | name | wid | price | stock | id | name | city | lat | long ..... When I run the query.. Session.createSQLQuery(this.query) .addEntity("p", Product.class) .addEntity("w", Warehouse.class).list(); So

问题 I have two matrices like the following ones: '01/01/2010' 1 '02/01/2010' 2 '03/01/2010' 3 '05/01/2010' 11 '06/01/2010' 17 '01/01/2010' 4 '02/01/2010' 5 '04/01/2010' 6 '05/01/2010' 7 , and after doing a few tricky things in MATLAB, I want to create the following three matrices: '01/01/2010' 1 4 '02/01/2010' 2 5 '03/01/2010' 3 NaN '04/01/2010' NaN 6 '05/01/2010' 11 7 '06/01/2010' 17 NaN '01/01/2010' 1 4 '02/01/2010' 2 5 '05/01/2010' 11 7 Any idea on how to join these tables? Cheers. EDIT:

问题 I have a SQL statement with some JOIN condition it is working fine for all of them but not the last one the code is below: SELECT A.EMPL_CTG, B.DESCR AS PrName, SUM(A.CURRENT_COMPRATE) AS SALARY_COST_BUDGET, SUM(A.BUDGET_AMT) AS BUDGET_AMT, SUM(A.BUDGET_AMT)*100/SUM(A.CURRENT_COMPRATE) AS MERIT_GOAL, SUM(C.FACTOR_XSALARY) AS X_Programp, SUM(A.FACTOR_XSALARY) AS X_Program, COUNT(A.EMPLID) AS EMPL_CNT, COUNT(D.EMPLID), SUM(CASE WHEN A.PROMOTION_SECTION = 'Y' THEN 1 ELSE 0 END) AS PRMCNT, SUM

问题 In the sql below I have the last 5 posts. But sometimes these posts are from the same author. I want to select the last 5 but just one per author. SELECT `e` . * , `f`.`title` AS `feedTitle` , `f`.`url` AS `feedUrl` , `a`.`id` AS `authorId` , `a`.`name` AS `authorName` , `a`.`about` AS `authorAbout` FROM `feed_entries` AS `e` INNER JOIN `feeds` AS `f` ON e.feed_id = f.id INNER JOIN `entries_categories` AS `ec` ON ec.entry_id = e.id INNER JOIN `categories` AS `c` ON ec.category_id = c.id INNER

问题 I have a table with rows that's grouped if the date and the category 'bar' matches, now I need to INNER JOIN these with another table and use a WHERE answer = '2' from that table, but I don't know how to do that. SELECT category, date, client FROM sbs_events WHERE category <> 'bar' UNION ALL SELECT category, date, MIN(client) AS client FROM sbs_events WHERE category = 'bar' GROUP BY category, date I've made a SQL Fiddle The thing I need to add to the fiddle is INNER JOIN sbs_userEvents ON sbs

问题 There are two tables: Table1 : UserID Name Job Table2 : BookID Book Car UserID I load these two tables in one wpf datagrid: da.SelectCommand = new SqlCommand("select Table1.UserID, Table1.Name, Table1.Job, Table2.Book, Table2.Car from Table1 inner join Table2 on Table1.UserID = Table2.UserID"); I want to delete one row from Table2 by DataGrid: SqlCommand com = new SqlCommand("delete from Table2 where BookID=@BookID)",con); but not work, How can I do it? 回答1: You say "It must delete a book

问题 SELECT PartyRelationshipID,[2] AS OrderGroup,[3] AS TaxStatus,[4] AS Area FROM ( SELECT prs.PartyRelationshipID ,prs.PartyRelationshipSettingTypeID ,Value = CONVERT(INT, CASE WHEN IsNumeric(CONVERT(VARCHAR(12), prs.Value)) = 1 then CONVERT(VARCHAR(12), prs.Value) else 0 End) FROM [Party].PartyRelationshipSetting prs) AS SourceTable INNER JOIN Party.PartyRelationship prship ON SourceTable.PartyRelationshipID = prship.ID INNER JOIN Party.PartyRole pr ON prship.ToPartyRoleID = pr.ID INNER JOIN