inner-join

问题 If this works: SELECT COUNT(t1.ID) AS count FROM Project t1 INNER JOIN (SELECT DISTINCT t.Site,t.id FROM _Equipment_id t WHERE t.OEM LIKE '%ABC%') t2 ON t1.Site=t2.Site AND t1.id=t2.id and this works: SELECT COUNT(t3.ID) AS count FROM Wall t3 INNER JOIN Project t1 ON t3.Project_number=t1.Project_number Why doesn't this work: SELECT COUNT(t3.ID) AS count FROM Wall t3 INNER JOIN Project t1 ON t3.Project_number=t1.Project_number INNER JOIN (SELECT DISTINCT t.Site,t.id FROM _Equipment_id t WHERE

问题 I have a query that I want to optimize. Both unions executed separatley run fine, however as soon as I include inner join it takes up to 57 seconds. How do I solve this. My query is as follows SELECT p.PROJID, p.StartDate, o.ORDERNO, p.PROJCODE, p.PROJECT, cat.type AS CATEGORY, p.AREA, p.STATE, p.COUNTRY, p.VALUE, p.PROCESSOR, p.PROJINFO, p.NES, p.SPECSALE, p.OFFICE, p.DEPTCODE, p.INTERNLCHG, p.INTERCOCHG, p.LORM, p.PERCENT, d.COMPANY, CONCAT( d.LASTNAME, ", ", d.FIRSTNAME ) AS Contact FROM (

问题 Given the following October CMS Plugin Models: Schema::create('iaff106_cellphone_cellphones', function($table){ $table->engine = 'InnoDB'; $table->increments('id'); $table->integer('user_id')->unsigned()->nullable()->index(); $table->string('label'); $table->string('phone')->nullable()->index(); $table->integer('provider_id')->nullable(); $table->boolean('is_txtable')->default(true); $table->boolean('is_published')->default(false); $table->timestamps(); }); Schema::create('iaff106_cellphone

问题 ALTER PROCEDURE [dbo].[GetValues] @FieldName NVARCHAR(50), @FormName NVARCHAR(50), @PoolName NVARCHAR(50) AS SELECT FieldValue FROM [dbo].[Values] INNER JOIN [dbo].[Fields] ON [dbo].[Fields].FieldID = [dbo].[Values].FieldID INNER JOIN [dbo].[FormFields] ON [dbo].[FormFields].FieldID = [dbo].[Fields].FieldID INNER JOIN [dbo].[Forms] ON [dbo].[Forms].FormID = [dbo].[FormFields].FormID INNER JOIN [dbo].[Pools] ON [dbo].[Pools].FormID = [dbo].[Forms].FormID WHERE [dbo].[Fields].FieldName =

问题 I am trying to do something very similar to this question: mysql - UPDATEing row based on other rows I have a table, called modset, of the following form: member year y1 y2 y3 y1y2 y2y3 y1y3 y1y2y3 a 1 0 0 0 0 0 0 0 a 2 0 0 0 0 0 0 0 a 3 0 0 0 0 0 0 0 b 1 0 0 0 0 0 0 0 b 2 0 0 0 0 0 0 0 c 1 0 0 0 0 0 0 0 c 3 0 0 0 0 0 0 0 d 2 0 0 0 0 0 0 0 Columns 3:9 are binary flags to indicate which combination of years the member has records in. So I wish the result of an SQL update to look as follows:

问题 I use JayData liberary and I want to know that it is possible to simulate inner join in JayData, like: Customers inner join Orders on Customers.CustomerID = Orders.CustomerID and how it could be possible? 回答1: AdHoc joins in general are not yet supported by JayData in the current release. It's on the roadmap though. It is however possible to achieve similar behavior on a number of ways, depending on your needs and the underlying data provider. I assume you are using the OData provider. In

问题 I have two data sets , EmployeeDetail(data set 1):- id name gender location SalaryDetail(data set 2):- id salary I need to join both and find out average salary of male and female in each location. So I tried following code . EmpDetail = load '/Users/bmohanty6/EmployeeDetails/EmpDetail.txt' as (id:int, name:chararray, gender:chararray, location:chararray); SalaryDetail = load '/Users/bmohanty6/EmployeeDetails/EmpSalary.txt' as (id:int, salary:float); JoinedEmpDetail = join EmpDetail by id,

问题 I have a specific request to do on my database (PostgreSQL v9.4.5), and I don't see any elegant solution in pure SQL to solve it (I know I can do it using Python or other, but I have several billions lines of data, and the calculation time would be greatly increased). I have two tables : trades and events . These tables both represent the trades occurring in an orderbook during a day (this is why I have several billions lines, my data is over several years) but there are many more events than

问题 I Get the following error when i try to update my table although there's n't any sub query : Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. MY QUERY : UPDATE t1 SET t1.modified = 2 FROM TransActions AS t1 INNER JOIN Ruser R ON t1.USERID = r.USERID WHERE r.dep_code = 54 and r.dep_year =2014 and YEAR(t1.checktime) =2016 and MONTH(t1.checktime) =1 and t1.modified = 0 The data selected like

问题 Let's say I have an Order and OrderDetails collections. How can I write following sql in LINQ (query or fluent syntax)? select top 1 OD.ProductId from Order O inner join OrderDetail OD on OD.OrderID = 1 and OD.OrderId = O.OrderId and ((OD.OrderDate = O.OrderDate) or (OD.OrderDate is null)) where O.CustomerId = 2 order by OD.OrderDate desc I know that I can create an anonymous type containing all the columns to match for join however how can I write conditional logic for inner join as