Ranking teams equal on points in a pool based on who won the game they played

Question

I\'m writing an application that calculates the ranking of teams in the pool stages of a rugby competition (Rugby World Cup 2015, but it could apply to many other pool-based

Answer 1

This need sql 2012+ using LEAD() and LAG() functions, Also require only two team have same Rank at this moment.

SCHEMA

CREATE TABLE Table1
    ([team] varchar(1), [rank] int);

INSERT INTO Table1
    ([team], [rank])
VALUES
    ('A', 1),('B', 1),('C', 2);

CREATE TABLE Table2
    ([team1] varchar(1), [team2] varchar(1), [win] varchar(1));

INSERT INTO Table2
    ([team1], [team2], [win])
VALUES
    ('A', 'B', 'B'), ('C', 'A', 'A'),('C', 'B', 'B');

SQL Fiddle Demo

WITH breakTie AS ( 
    SELECT
        [team],
        [rank],
        LAG([team]) OVER (ORDER BY [rank]) PreviousTeam,
        LEAD([team]) OVER (ORDER BY [rank]) NextTeam,
        LAG([rank]) OVER (ORDER BY [rank]) PreviousRank,
        LEAD([rank]) OVER (ORDER BY [rank]) NextRank
    FROM Table1
)
SELECT *, CASE 
       WHEN B.[rank] = B.[NextRank] and B.[team] = T.[win] THEN 1
       WHEN B.[rank] = B.[PreviousRank] and B.[team] = T.[win] THEN 1
       ELSE 0
    END as breakT
FROM breakTie B
LEFT JOIN Table2 T
   ON ( B.team = T.team1 or B.team = T.team2)
  AND ( B.NextTeam = T.team1 or B.NextTeam = T.team2)
ORDER BY 
    [rank],
    CASE 
       WHEN B.[rank] = B.[NextRank] and B.[team] = T.[win] THEN 1
       WHEN B.[rank] = B.[PreviousRank] and B.[team] = T.[win] THEN 1
       ELSE 0
    END