使用SQL Server选择语句

Question

我正在使用Microsoft SQL Server Management 2016

我正在试图弄清楚有多少玩家在19/1年1月1日之前有一场最后一场比赛，事情是我不知道我的代码是否正确，因为它没有任何回归。

SELECT deathDate, finalGameDate FROM Players 
WHERE deathDate IS NOT NULL AND deathDate = '1990/01/01' and finalGameDate IS NOT NULL

我也试图找出谁更倾向于体重，国内出生或外国出生的球员，这里也有一些数据表，我试图做出声明，我无法想象它让我不断得到左右错误;这是我从头开始的基本选择。我已经尝试过函数，这就是我得到错误的地方。

SELECT weight, birthCountry FROM Players where birthCountry is not null 
and weight is not null

Answer 1

问题1

尝试：

 SELECT deathDate, finalGameDate FROM Players
   WHERE Convert(datetime,finalGameDate) <= '1990/01/01'
   AND deathDate Is Not NULL

问题2

尝试：

  SELECT 
        weight, birthCountry,
        case When birthCountry = 'USA' then 'Domestic-Born'
             Else 'Foreign-Born'
        End as [Born]
  FROM Players Order by weight desc