left-join

问题 I have table Groups, ID NUMBER STATUS VARCHAR2(20 BYTE) I am able to count the number of status as following. select g.status, count(*) from groups g group by g.status; STATUS COUNT(*) -------------------- ---------- OK 2 NOK 1 I have another status ,say PENDING, REJECTED. But there is no item exists in table, but I want them to be shown with zero count as following. STATUS COUNT(*) -------------------- ---------- OK 2 NOK 1 PENDING 0 REJECTED 0 What will be the SQL statement to make it

问题 I have two tables. TableA: field_definitions field_id, field_type, field_length, field_name, field_desc, display_order, field_section, active TableB: user_data response_id, user_id, field_id, user_response I need a query that will return all rows from table A and, if they exist, matching rows from table B based on a particular user_id. Here is what I have so far... SELECT field_definitions. * , user_data.user_response FROM field_definitions LEFT JOIN user_data USING ( field_id ) WHERE ( user

问题 I'm trying to rewrite SQL procedure to Linq, it all went well and works fine, as long as it works on small data set. I couldn't really find answer to this anywhere. Thing is, I have 3 joins in the query, 2 are left joins and 1 is inner join , they all join to each other/like a tree. Below you can see SQL procedure: SELECT ... FROM sprawa s (NOLOCK) LEFT JOIN strona st (NOLOCK) on s.ident = st.id_sprawy INNER JOIN stan_szczegoly ss (NOLOCK) on s.kod_stanu = ss.kod_stanu LEFT JOIN broni b

问题 I'm trying to rewrite SQL procedure to Linq, it all went well and works fine, as long as it works on small data set. I couldn't really find answer to this anywhere. Thing is, I have 3 joins in the query, 2 are left joins and 1 is inner join , they all join to each other/like a tree. Below you can see SQL procedure: SELECT ... FROM sprawa s (NOLOCK) LEFT JOIN strona st (NOLOCK) on s.ident = st.id_sprawy INNER JOIN stan_szczegoly ss (NOLOCK) on s.kod_stanu = ss.kod_stanu LEFT JOIN broni b

问题 Is it possible to implement left join in linq in NHibernate 3.2 ? I want to achive a linq query similar to this sql query: select v.*, cp.EffectiveStart from Visits v join VisitServices vs on v.Id = vs.VisitId left join CarePlans cp on cp.Id = vs.CarePlanId I have written such linq query: var c = (from v in EntitiesRepository join vs in _visitServiceRepository on v.Id equals vs.Visit.Id join cp in _carePlanRepository on vs.CarePlan.Id equals cp.Id into pp from pl in pp.DefaultIfEmpty() select

问题 I've 2 cell arrays in MATLAB, for example: A= {jim,4,paul,5 ,sean ,5,rose, 1} and the second: B= {jim, paul, george, bill, sean ,rose} I want to make an SQL left join so I'll have all the values from B and their match from A. If they don't appear in A so it will be '0'. means: C= {jim, 4, paul, 5, george, 0, bill, 0, sean, 5, rose, 1} didn't find any relevant function for help. thanks. 回答1: Approach #1 %// Inputs A= {'paul',5 ,'sean' ,5,'rose', 1,'jim',4} B= {'jim', 'paul', 'george', 'bill',

问题 Currently this function works : it displays for a specific game, how many jobs there are. The problem : If there is no job, the game does not appear on the list. How to display the game even if there is no job attached ? Thanks public function getWithGames() { $q = $this->createQuery('c') ->leftJoin('c.stJob j') ->where('j.expires_at > ?', date('Y-m-d h:i:s', time())) ->addOrderBy('c.name'); $q->andWhere('j.is_activated = ?', 1); $q->andWhere('j.is_public = ?', 1); return $q->execute(); } 回答1

问题 i have a problem with joining three tables in mysql. lets say we have a table named posts which I keep my entries in it, i have a table named likes which i store user_id's and post_id's in and a third table named comments which i store user_id's and post_id's and comment's text in it. I need a query that fetches list of my entries, with number of likes and comments for each entry. Im using this query: SELECT posts.id, count(comments.id) as total_comments, count(likes.id) as total_likes FROM

问题 This question already has answers here : Dplyr join on by=(a = b), where a and b are variables containing strings? (4 answers) Closed 10 months ago . I can join two datasets that contain two variables with different names using dplyr::left_join(..., by = c("name1" = "name2") . I want to join using character objects, left_join(..., by = c(nameOb1 = nameOb2) . Oddly: this works for by = c("name1", nameOb2) , but not for by = c(nameOb1, "name2") . Why is this? Replication of my issue below. Many

问题 I have been trying to wrap my head around this issue but I am not making much progress. My goal is to do a left join between two tables with criteria for the right table. I would like to see the list of all products and prices for the current day even though there is no pricing row for the current day. Here is an example of the code: SELECT products.id, products.name, prices.price FROM products LEFT JOIN prices ON products.id = prices.id WHERE prices.date = CURRENT_DATE This produces only the