Sql Server復雜子查詢

Question

考慮這兩個表：

CREATE TABLE GAME_ROUNDS(
    RoundId int primary key NOT NULL,
    GameId int NOT NULL,
    RoundNumber int NOT NULL,
    Value varchar(20) ,
    Guess varchar(20) ,
    Answer varchar(20) ,
    Correct bit NOT NULL,       
    Seconds int NOT NULL,
    Milliseconds int NOT NULL)

CREATE TABLE GAMES(
    GameId int  primary key NOT NULL,
    GameTypeId int NOT NULL,
    GameDate datetime NOT NULL,     
    GameValues varchar(500) null)

以下是一些示例數據：

insert into games(gameid, gametypeid, gamedate, gamevalues) values(1, 1,'2011-11-01 08:00:16.790',NULL)
insert into games(gameid, gametypeid, gamedate, gamevalues) values(2, 1,'2011-11-02 10:48:37.257',NULL)
insert into games(gameid, gametypeid, gamedate, gamevalues) values(3, 1,'2011-11-03 15:35:52.160',NULL)
insert into games(gameid, gametypeid, gamedate, gamevalues) values(4, 1,'2011-11-03 14:35:52.160',NULL)
insert into games(gameid, gametypeid, gamedate, gamevalues) values(5, 2,'2011-10-30 21:28:27.803','00,01,02,03,04,05,06,07,08,09')
insert into games(gameid, gametypeid, gamedate, gamevalues) values(6, 2,'2011-11-02 21:28:14.770','00,01,02,03,04,05,06,07,08,09')
insert into games(gameid, gametypeid, gamedate, gamevalues) values(7, 2,'2011-11-03 21:28:14.770','00,01,02,03,04,05,06,07,08,09')
insert into games(gameid, gametypeid, gamedate, gamevalues) values(8, 2,'2011-11-04 21:32:15.470','10,11,12,13,14,15,16,17,18,19')
insert into games(gameid, gametypeid, gamedate, gamevalues) values(9, 2,'2011-11-05 22:32:15.470','10,11,12,13,14,15,16,17,18,19')
insert into games(gameid, gametypeid, gamedate, gamevalues) values(10, 2,'2011-11-06 21:32:15.470','10,11,12,13,14,15,16,17,18,19')

insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(1, 1, 1,'Feb', '4', '4', 1, 0, 500)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(2, 1, 2,'Jul', '0', '0', 1, 0, 500)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(3, 1, 3,'Mar', '4', '4', 1, 0, 531)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(4, 2, 1,'Dec', '6', '6', 1, 0, 437)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(5, 2, 2,'May', '2', '2', 1, 0, 484)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(6, 2, 3,'Sep', '6', '6', 1, 0, 500)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(7, 3, 1,'Mar', '4', '3', 0, 0, 515)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(8, 3, 2,'Apr', '0', '0', 1, 0, 484)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(9, 3, 3,'May', '2', '2', 1, 0, 500)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(10, 4, 1,'Oct', '1', '1', 1, 0, 468)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(11, 4, 2,'Jan', '1', '1', 1, 0, 500)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(12, 4, 3,'Nov', '4', '4', 1, 0, 484)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(13, 5, 1,'0', '0', '0', 1, 0, 637)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(14, 5, 2,'5', '6', '6', 1, 0, 875)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(15, 5, 3,'8', '3', '3', 1, 0, 531)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(16, 6, 1,'9', '4', '4', 1, 0, 472)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(17, 6, 2,'6', '0', '0', 1, 0, 563)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(18, 6, 3,'8', '3', '3', 1, 0, 443)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(19, 7, 1,'0', '0', '0', 1, 0, 468)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(20, 7, 2,'9', '4', '4', 1, 0, 456)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(21, 7, 3,'4', '5', '5', 1, 0, 547)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(22, 8, 1,'12', '1', '1', 1, 0, 615)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(23, 8, 2,'18', '1', '1', 1, 0, 701)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(24, 8, 3,'16', '6', '6', 1, 0, 515)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(25, 9, 1,'10', '5', '5', 1, 0, 500)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(26, 9, 2,'19', '2', '2', 1, 0, 546)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(27, 9, 3,'15', '4', '4', 1, 0, 515)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(28, 10, 1,'13', '2', '2', 1, 0, 484)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(29, 10, 2,'12', '1', '1', 1, 0, 484)
insert into game_rounds(roundid, gameid, roundnumber, value, guess, answer, correct, seconds, milliseconds) values(30, 10, 3,'11', '6', '6', 1, 0, 453)

這些表是我正在處理的記憶游戲的一部分。 細節並不重要但是當你玩游戲時你的猜測時間會有所改善。

一個例子是一個游戲，你必須在提交月份時給出月份代碼。 所以Oct = 1，Nov = 4，Dec = 6等。

我想寫一個查詢，告訴我每個gametypeid和gamevalues組合gameid，平均猜測達到500毫秒。

這是我到目前為止：

select vt.gametypeid, vt.gamevalues, min(vt.gamedate)
from (
         select dg.gametypeid, dg.gameid, dg.gamedate, dg.gamevalues, count(gr.gameid) as numberofrounds, cast(sum(gr.seconds*1000 + gr.milliseconds) as decimal)/cast(count(gr.gameid) as decimal) as avgguessmilliseconds
         from game_rounds gr (nolock)
         inner join games dg (nolock) on dg.gameid = gr.gameid
         where gr.gameid not in(select gameid from game_rounds (nolock) where correct = 0)
         group by gr.gameid, dg.gametypeid, dg.gamevalues, dg.gamedate, dg.gameid, dg.gamedate
         having cast(sum(gr.seconds*1000 + gr.milliseconds) as decimal)/cast(count(gr.gameid) as decimal) <= 500
) vt
group by vt.gametypeid, vt.gamevalues

這是結果

gametypeid  gamevalues                                         gamedate
----------- -------------------------------------------------- -----------------------
1           NULL                                               2011-11-02 10:48:37.257
2           00,01,02,03,04,05,06,07,08,09                      2011-10-30 21:28:27.803
2           10,11,12,13,14,15,16,17,18,19                      2011-11-04 21:32:15.470

問題是我沒有GameId引用回來。 我不想在我的結果集中重新獲得gameid。

有沒有辦法使用純SQL（沒有游標或表變量）？

Answer 1

我猶豫不決的回答是“是” 。 我認為APPLY運算符適合您，因為您需要每行結果而不使用游標或表變量。 檢查此鏈接 。

Answer 2

我想這會對你有用。 我假設你想要的是符合指定標准的第一款游戲（因為你在你的例子中使用了游戲命令的最小值）。 顯然，每個gametypeid / values組合可以有多個游戲適合賬單。

SELECT GameId, 
       GameTypeId, 
       GameValues, 
       GameDate 
FROM
(
   SELECT   G.GameId,
        G.GameTypeId,
        G.GameValues,
        G.GameDate,
        RANK() OVER(Partition By G.GameTypeId, G.GameValues Order By
               G.GameDate DESC) As Ranking 
    FROM    GAMES G
    JOIN    GAME_ROUNDS GR
        ON  G.GameId = GR.GameId
    GROUP
    BY      G.GameId,
        G.GameTypeId,
        G.GameValues,
        G.GameDate
    HAVING  SUM(CASE GR.Correct WHEN 0 THEN 1 ELSE 0 END) = 0
    AND     AVG(CAST(GR.Seconds * 1000 + GR.Milliseconds as DECIMAL)) <= 500
) CandidateResults
WHERE   Ranking = 1