inner-join

问题 Ok, say i have two tables products and product_options . structure table products be like: +--------------------------------------+ | p_id | product_name | product_status | +--------------------------------------+ | 1 | Keyboard ABC | PENDING | | 2 | Mouse ABC | ORDERED | | 3 | Monitor ABC | ORDERED | +--------------------------------------+ And table product_options be like: +--------------------------------------+ | po_id | p_id | opt_name | opt_value + +------------------------------------

问题 We are using Microsoft SQL Server 2008 R2 for one of our Classic ASP applications. We have two tables: TableA TableB TableA has the following columns: InstName(varchar[1024]) TableB has these columns: InstitutionName(varchar[1024]) However, we came across some data like the following TableA InstName with value University of Nantes [ Universites de Nantes ] TableB InstitutionName with value University of Nantes [ Universites de Nantes ] We need to run inner join select queries on the said 2

问题 The sql statement below will not run in SQLite: select * from A left join (B inner join C on B.fkC = C.pk) on A.optionalfkB = B.pk I get a sqlException "unknown column B.pk" According to the documentation @ http://www.sqlite.org/lang_select.html this should work, and it will work in all other sql implementations. Am I doing something wrong? 回答1: It doesn't work because the "outer" query doesn't know what B is. select * from A left join (B inner join C on B.fkC = C.pk) B on A.optionalfkB = B

问题 Howdie do, I have the following SQL query which takes about 4 seconds to run: select o.id, tu.status_type, m.upload_date from (select order_id, max(last_updated) as maxudate from tracking_update group by order_id) t inner join tracking_update tu on t.order_id=tu.order_id and t.maxudate=tu.last_updated right join fgw247.order o on t.order_id=o.id left join manifest m on o.manifest_id=m.id where (m.upload_date >= '2015-12-12 00:00:00') or (m.upload_date <='2015-12-12 00:00:00' and tu.status

问题 I have a table 1 and table 2. Table 1 PARTNUM - ID_BRAND partnum is the primary key id_brand is "indexed" Table 2 ID_BRAND - BRAND_NAME id_brand is the primary key brand_name is "indexed" The table 1 contains 1 million of records and the table 2 contains 1.000 records. I'm trying to optimize some query using EXPLAIN and after a lot of try I have reached a dead end. EXPLAIN SELECT pm.partnum, pb.brand_name FROM products_main AS pm LEFT JOIN products_brands AS pb ON pm.id_brand=pb.id_brand

问题 I'm not much of a database guru so I need some help on a query I'm working on. In my photo community project I want to richly visualize tags by not only showing the tag name and counter (# of images inside them), I also want to show a thumb of the most popular image inside the tag (most karma). The table setup is as follow: Image table holds basic image metadata, important is the karma field Imagefile table holds multiple entries per image, one for each format Tag table holds tag definitions

问题 This is a very very important sql query after which my whole website is based.. and its not working.. Its difficult to explain without an example.. There are 2 tables, One is IngredientsTable and other one is ProductsTable. In IngredentsTable i have the following Bread ChickenBreast Noodles Mayonaise Cheese Ketchup Butter And the ProductsTable Spageti Chicken Breast Sandwich And there is a MAPPING TABLE that connects both tables. It has IngredientID and ProductID Now, Mapping table Chicken

问题 I have write a inner join query. In SQL Server it is working fine, but I want to write this query using Linq-to-SQL. Can anybody help me please? Here is my query in SQL Server: select db.Firstname, db.lastname, lo.BiPayAmt, lo.Loan_ID, sc.Pmt_Id, sc.Terms, sc.pmt_dates, sc.LoanId from dbo.Clients db inner join dbo.Loans lo on db.Client_ID = lo.Client_ID inner join dbo.SchedulePayments sc on lo.Loan_ID = sc.LoanId 回答1: Roughly this: from db in dbo.Clients join lo in dbo.Loans on db.Client_ID

问题 I am using the following query to join two tables together: SELECT SDA.smachIPAddress, DPP.ScanName, DPP.pspplMSSeverity, DPP.PatchMissing, DPP.ScanDate FROM patchtest_withsev DPP INNER JOIN patchtest_withip SDA ON DPP.ScanName =SDA.ScanName and receiving 2351 rows of data When I query the patchtest_withsev table for all records it only returns 99 and the patchtest_withip table only returns 99. Can anyone see why this query is producing such a large mismatch? 回答1: It seems that both table

问题 I have a table in my database named contacts and a table named views. On the table contacts I have the following fields: id status first_name last_name The status can be cold, prospect or lost. On the table views I have the following fields: user_id art_views art_title The relation between those 2 tables is id and user_id. I need a query to make a new html table with the following columns: art_title cold prospect lost Now I have the following query (UPDATED): SELECT v.art_title, SUM(CASE c