SQL,如何将VARCHAR转换为bigint？

Question

我有一个字段,VARCHAR(6)我试图将其插入另一个类型的表,bigint 它给我一个错误

(错误从数据类型varchar转换为bigint

这就是我在做的事情

CONVERT(bigint, seconds) as seconds

任何人都可以帮助解决这个问题吗？

Answer 1

这就是答案

(CASE
  WHEN
    (isnumeric(ts.TimeInSeconds) = 1) 
  THEN
    CAST(ts.TimeInSeconds AS bigint)
  ELSE
    0
  END) AS seconds

Answer 2

另一种选择是执行以下操作：

SELECT
   CAST(P0.seconds as bigint) as seconds
FROM
   (
   SELECT
      seconds
   FROM
      TableName
   WHERE
      ISNUMERIC(seconds) = 1
   ) P0