inner-join

问题 I'm trying to JOIN two tables in MySQL . Here is my table: Games Table : GameID Date/Time PlayerOneID PlayerTwoID 13 12/10/2013 10:53:29 PM 1 2 14 12/10/2013 10:57:29 PM 1 2 15 12/10/2013 10:58:29 PM 2 1 I have another table contain the ID of a player and that players name. Players Table : 1 Dan 2 Jon I'd like the resulting table to look like the following: GameID Date/Time PlayerOneID PlayerTwoID 13 12/10/2013 10:53:29 PM Dan Jon 14 12/10/2013 10:57:29 PM Dan Jon 15 12/10/2013 10:58:29 PM

问题 ColA(Table1) ColB(Table2) AB3 AB_MNO_3 AB3 AB_PQR_3 AB4 AB_MNO_4 AB4 AB_PQR_4 I want to do Inner Join based on columns in two table with some of the non-equal values shown above. So, Table1 can have AB3 which should be matched against AB_MNO_3, AB_PQR_3 while AB4 should be matched against AB_MNO_4, AB_PQR_4 Rest of the values in these columns in two tables do match. Would highly appreciate if anyone provides recommendations around the same. 回答1: SELECT * FROM Table1 tl INNER JOIN Table2 t2 ON

问题 I have two tables. I want to select 1 record from first table if condition is true in second table (active = 0) table Lead: ------------- | id | name | ------------- | 1 | abc1 | | 2 | abc2 | | 3 | abc3 | | 4 | abc4 | | 5 | abc5 | ------------- table LeadsDetails: ------------------------- | id | lead_id | active | ------------------------- | 1 | 1 | 1 | | 2 | 1 | 0 | | 3 | 2 | 0 | | 4 | 3 | 1 | | 5 | 4 | 0 | | 6 | 5 | 0 | | 7 | 5 | 0 | -------------------------- expected output: ------------

问题 CREATE TABLE y (Id INT NOT NULL PRIMARY KEY ); CREATE TABLE x (YId INT NOT NULL REFERENCES y (Id)); DECLARE @YId INT = …; If I wanted to select all records in x where YId is equal to @YId , I could to this three different ways: /* 1: */ SELECT x.* FROM x WHERE x.YId = @YId; /* 2: */ SELECT x.* FROM x INNER JOIN y ON x.YId = @YId; /* 3: */ SELECT x.* FROM x INNER JOIN y ON x.YId = y.Id WHERE y.Id = @YId; Query 1 is obviously the most straight-forward query, and the one with the best

问题 I have 2 tables with several identical fields needed to be linked in JOIN condition. E.g. in each table there are fields: P1, P2. I want to write the following join query: SELECT ... FROM Table1 INNER JOIN Table2 ON Table1.P1 = Table2.P1 OR Table1.P2 = Table2.P2 OR Table1.P1 = Table2.P2 OR Table1.P2 = Table2.P1 In the case I have huge tables this request is executing a lot of time. I tried to test how long will be the request of a query with one condition only. First, I have modified the

问题 I am in trouble I have 2 table in sqlite and want both field from them but I did not got any thing. I have tried a lot on stack overflow but no one is work for me.. My query is something like that- public List<HeadItemGroup> getAllExpense() { List<HeadItemGroup> expenseList = new ArrayList<HeadItemGroup>(); db = sqlHp.getReadableDatabase(); String selectquery = "SELECT table_expense.item_id AS ID,table_item.item_id AS ID2,* FROM table_expense INNER JOIN table_item ON table_expense.item_id

问题 I am getting a syntax error with the following problem and can't seem to figure out, hope you guys can help me! I have these tables (they are populated): I am trying to retrieve the first and last name of all the passengers scheduled in a certain flight number so what I have is this: SELECT PassFName, PassLName FROM Passenger INNER JOIN PassID ON Passenger.PassID = Reservation.PassID INNER JOIN FlightNum ON FlightNum.Reservation = FlightNum.ScheduledFlight WHERE ScheduledFlight.FlightNum =

问题 I couldn't think of a good way to word the title, if anyone can come up with something better please feel free. Basically there is an old VB6 app that pulls data from a db that I have more or less completely restructured and gives the user a dump of all of the product information at once. So I need to do some inner joins to get all of these tables together. I know how to do basic inner joins but I am stuck on one detail. There are a few tables where there are multiple entries for each item.

问题 I have a two simple tables users +----+--------+-----------+ | id | gender | birthdate | +----+--------+-----------+ userpreference +----+------------------+-----------------+ | id | preference value | preference type | +----+------------------+-----------------+ Question: I want to query all people who have not listed a specific preference value such as 'shopping'.This includes all people who have not listed any preference types as well so that column could be null, however since

问题 Hi everyone I am currently working on an SQL sample project, trying to learn the basics of SQL and inner outer joins in general. This is my current Database diagram: http://imgur.com/z0Ger I am currently stuck on 2 different queries that I am having trouble writing. 1. Given a puppy name show all the tricks it knows. Include: Dog id & name Trick id & name Date learned & skill level 2. Given a kennel show all the puppies that have been there to learn a trick. Include: Kennel id & name Date