检测MySQL中的值是否为数字

2021-11-20 00:00:00 sql where-clause mysql

有没有办法检测一个值是否是 MySQL 查询中的数字?比如

Is there a way to detect if a value is a number in a MySQL query? Such as

SELECT * 
FROM myTable 
WHERE isANumber(col1) = true

推荐答案

这应该适用于大多数情况.

This should work in most cases.

SELECT * FROM myTable WHERE concat('',col1 * 1) = col1

它不适用于非标准数字，例如

It doesn't work for non-standard numbers like

  • 1e4
  • 1.2e5
  • 123.(尾随十进制)
  • 1e4
  • 1.2e5
  • 123. (trailing decimal)

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