outer-join

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'm analyzing game data. My data includes game id (GID), player id (PID), and Time slice (T),.... Table A and B are two tables that created by my queries as follow: Table A GID, PID, T, command_freq, command_id 1, 1, 0, 17, 10 1, 1, 0, 4, 5 1, 1, 1, 26, 10 1, 1, 1, 6, 5 1, 1, 2, 5, 5 1, 1, 2, 3, 10 1, 1, 5, 7, 10 Table B GID, PID, T, order_freq, order_id 1, 1, 0, 7, 40 1, 1, 2, 3, 40 1, 1, 2, 11, 42 1, 1, 5, 1, 40 I need to find in which commands and orders are done in each time slice (also

问题 Starting with the collection below, what Linq statement do I need to return a results set that satisfies the test? private List<dynamic> _results; [SetUp] public void SetUp() { _results = new List<dynamic> { new {Id = 1, Names = new[] {"n1"}, Tags = new[] {"abc", "def"}}, new {Id = 2, Names = new[] {"n2", "n3"}, Tags = new[] {"ghi"}}, new {Id = 3, Names = new[] {"n1", "n3"}, Tags = new[] {"def", "xyz"}}, new {Id = 4, Names = new[] {"n4"}, Tags = new string[] {}} }; } private ILookup<string,

问题 I already tried various types of JOINS but I am not able to get this simple query to work. I would like to have the result of table a in any case, even if there is no corresponding entry in table b. I tried: SELECT a.user_id, a.user_name, b.first_name FROM users a LEFT OUTER JOIN members b ON a.member_uid = b.uid WHERE (a.user_name = 'TEST' AND b.active = 1) In this case, there is no entry in b that has b.active = 1. But I assumed that all wanted columns from a would be returned and the

问题 I have a query to subtract current balance from one table with previous balance from another history table. When a particular product has no current balance but has previous balance, I am able to subtract it correctly...in this case it will be like 0 - 100. However, when the product has current balance but no previous balance, I am unable to get the result. My query does not even select the current balance even though I have done a full outer join on both tables. Following is my query: SELECT

问题 I'm attempting to create an SQL view that consolidates a number of separate select queries. I've encountered some difficulty putting clauses from the individual select statements into the database view. A simplified version of my view is: create or replace view TestView as select A.Name, B.Subscription, C.Expiry from TestTableA as A left outer join TestTableB as B on A.ID = B.A_ID left outer join TestTableC as C on A.ID = C.A_ID; I've got two problems with the view: On the frist join how can

问题 I need a lot of help with my join statement, as it multiplies the rows of the two tables that I'm trying to join: My Sample data: SAPId CompendiumId Seats ----- ------------ ----- 1 443 21 2 443 22 3 443 23 4 443 24 5 443 25 6 571 25 7 352 20 QBId CompendiumId Slots ----- ------------ ----- 1 443 26 2 443 27 3 571 25 4 571 23 My desired output is: CompendiumId Seats Slots ------------ ----- ----- 443 115 53 571 25 48 352 20 0 but the result of my code is: CompendiumId Seats Slots ------------

问题 How to rewrite this: select tab1.id, tab2.id, tab3.id from tab1, tab2, tab3 where tab1.col1 = tab2.col1(+) and tab2.col2 = tab3.col2(+); using OUTER JOIN syntax? 回答1: select tab1.id, tab2.id, tab3.id from tab1 left outer join tab2 on tab1.col1 = tab2.col1 left outer join tab3 on tab2.col2 = tab3.col2; 来源： https://stackoverflow.com/questions/325852/oracle-join-operator

问题 How to rewrite this: select tab1.id, tab2.id, tab3.id from tab1, tab2, tab3 where tab1.col1 = tab2.col1(+) and tab2.col2 = tab3.col2(+); using OUTER JOIN syntax? 回答1: select tab1.id, tab2.id, tab3.id from tab1 left outer join tab2 on tab1.col1 = tab2.col1 left outer join tab3 on tab2.col2 = tab3.col2; 来源： https://stackoverflow.com/questions/325852/oracle-join-operator

问题 I have two tables in a database. Table 1 includes an order number which could be NULL. Table two contains all order data (including the order number). Now I want to select all columns from table 1 and all order data from table two. So if a certain entry in table one doesn't contains this order number, all other columns should be null. But if it does contain an order number I want it to be linked to the second table and have these data selected. Output should be something like: column1tab1