c# - 如何进行sql查询将数据库字符串分成3个不同的部分并比较它们？

Question

我想做的是:在出生日期(nvarchar，不是日期类型)之后对数据库中的人员进行排序，日期采用以下字符串格式:dd-MM-yyyy 并按排序，我的意思是返回所有内容的列表人，但在出生日期之后排序，以填充 datagridview。

我有一列包含出生日期，它是 nvarchar。我想在 sql 查询中将日、月和年存储在 3 个变量中，并测试它们以便将它们按顺序排列。

我尝试的是:

SELECT SUBSTRING(date_of_birth,0,2) FROM people AS zi;
SUBSTRING(date_of_birth,3,2) AS luna
SUBSTRING(date_of_birth,6,4) AS an
SELECT [id], [specie], [sex], [date_of_birth], [greutate] FROM [people] WHERE

但我真的不知道从现在起如何解决......

Answer 1

SELECT
  [id], [specie], [sex], [date_of_birth], [greutate],
  SUBSTRING(date_of_birth,6,4)  AS [an],
  SUBSTRING(date_of_birth,3,2)  AS [luna],
  SUBSTRING(date_of_birth,0,2)  AS [zi]
FROM
  [people]
ORDER BY
  SUBSTRING(date_of_birth,6,4),
  SUBSTRING(date_of_birth,3,2),
  SUBSTRING(date_of_birth,0,2)

许多 RDBMS 也允许这样做...

SELECT
  [id], [specie], [sex], [date_of_birth], [greutate],
  SUBSTRING(date_of_birth,6,4)  AS [an],
  SUBSTRING(date_of_birth,3,2)  AS [luna],
  SUBSTRING(date_of_birth,0,2)  AS [zi]
FROM
  [people]
ORDER BY
  [an], [luna], [zi]