Sql 从两个变量生成年龄时，将表达式转换为数据类型时出现算术溢出错误

我试图从两个表中提取数据，首先生成数据库中每个人的注册年数，然后连接到另一个表以限制年龄组，目的是获得标准中所有人的注册总年数。我当前收到了错误消息

“将表达式转换为数据类型时出现算术溢出错误”

obsdate变量是'YYYY-DD-MM'日期格式，而yob是'yyy'smallint，但我认为使用YEARobsdate已经解决了这个问题，问题可能在别处

我看到添加了“CASTsubquery.yearsreg AS BIGINT”，这给了我一个远高于预期的数字，我不确定它是否达到了我的期望

SELECT SUM(subquery.yearsreg)
FROM (
    SELECT id, yob,
        (CASE
        WHEN pat.deathdate IS NOT NULL AND pat.deathdate <= pat.regenddate THEN (YEAR(pat.deathdate)-YEAR(pat.regstartdate))
        WHEN pat.deathdate IS NOT NULL AND pat.deathdate > pat.regenddate THEN (YEAR(pat.regenddate)-YEAR(pat.regstartdate))
        WHEN pat.deathdate IS NULL AND pat.regenddate IS NOT NULL THEN (YEAR(pat.regenddate)-YEAR(pat.regstartdate))
        ELSE YEAR(getdate())-YEAR(pat.regstartdate)
        END) AS yearsreg
    FROM Patient AS pat
) AS subquery
INNER JOIN Observation AS obs ON subquery.id = obs.id
WHERE obs.obsdate > '2004-12-31' AND obs.obsdate <= '2018-12-31'
    AND ((YEAR(obs.obsdate))-subquery.yob) > 15 AND ((YEAR(obs.obsdate))-subquery.yob) < 45

试试这个：

SELECT SUM(subquery.yearsreg)
FROM (
  SELECT id, CONVERT(INT,yob),
    (CASE
      WHEN pat.deathdate IS NOT NULL AND pat.deathdate <= pat.regenddate THEN (YEAR(pat.deathdate)-YEAR(pat.regstartdate))
      WHEN pat.deathdate IS NOT NULL AND pat.deathdate > pat.regenddate THEN (YEAR(pat.regenddate)-YEAR(pat.regstartdate))
      WHEN pat.deathdate IS NULL AND pat.regenddate IS NOT NULL THEN (YEAR(pat.regenddate)-YEAR(pat.regstartdate))
      ELSE YEAR(getdate())-YEAR(pat.regstartdate)
    END) AS yearsreg
  FROM Patient AS pat
  WHERE pat.yob IS NOT NULL AND pat.regstartdate IS NOT NULL
) AS subquery
INNER JOIN Observation AS obs ON subquery.id = obs.id
WHERE obs.obsdate > '2004-12-31' AND obs.obsdate <= '2018-12-31'
  AND ((YEAR(obs.obsdate))-subquery.yob) > 15 AND ((YEAR(obs.obsdate))-subquery.yob) < 45

尝试将yob转换为int，只是为了它，只是为了防止某些类型的冲突情况。 YEAR转换为int，应该由它决定结果的大小，但您永远不知道。。 regstartdate也可以为空，我认为年份将在1900年转换它。我现在没有SQLServer可供试用。

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试着运行几个查询，看看是否有用户插入了疯狂的日期，比如12-31-9999或01-01-1753，显然datetime走得那么远

什么是表模式？你能给我们提供一些样本数据和预期结果吗？欢迎来到Stack Overflow，Katie。为了帮助我们帮助您，请阅读下面的内容。看看这个，然后是您的问题以及创建所需的详细信息。您是否检查过yob字段是否有任何空值，并最终将其从查询中排除？yob的数据类型？@DaleK抱歉，我使用的是SQL Server。感谢帮助@devtech不幸地仍然给出了相同的错误。我明白了，那么到错误必须在别处我正在编辑答案