您可以使用

You could use SUBSTRING_INDEX twice, the second one with -1 parameter:

SELECT
  'aaaaa, bbbbb, ccccc',
  SUBSTRING_INDEX('aaaaa, bbbbb, ccccc', ',', 1) AS column_one,
  SUBSTRING_INDEX(SUBSTRING_INDEX('aaaaa, bbbbb, ccccc', ',', 2), ',', -1) AS column_two,
  SUBSTRING_INDEX(SUBSTRING_INDEX('aaaaa, bbbbb, ccccc', ',', 3), ',', -1) AS column_three

如果参数为负，则返回最终定界符右侧的所有内容(从右侧开始计数).例如

If the parameter is negative, everything to the right of the final delimiter (counting from the right) is returned. Eg.

• SUBSTRING_INDEX('aaaaa, bbbbb, ccccc', ',', 2)将返回aaaaa, bbbbb
• SUBSTRING_INDEX( aaaaa，bbbbb , ',', -1)然后将返回bbbbb

• SUBSTRING_INDEX('aaaaa, bbbbb, ccccc', ',', 2) will return aaaaa, bbbbb
• SUBSTRING_INDEX(aaaaa, bbbbb, ',', -1) will then return bbbbb

您可能还想使用'，'作为分隔符，或 TRIM 结果.

You also might want to use ', ' as a delimiter, or TRIM the result.

请在此处看到小提琴.

修改

如果您想考虑可能少于三个值的字符串，则可以使用以下内容:

If you want to consider strings that might have less than three values, you could use something like this:

SELECT
  s,
  SUBSTRING_INDEX(s, ',', 1) AS column_one,
  CASE WHEN LENGTH(s)-LENGTH(Replace(s, ',', ''))>0
       THEN SUBSTRING_INDEX(SUBSTRING_INDEX(s, ',', 2), ',', -1)
       ELSE NULL END AS column_two,
  CASE WHEN LENGTH(s)-LENGTH(Replace(s, ',', ''))>1
       THEN SUBSTRING_INDEX(SUBSTRING_INDEX(s, ',', 3), ',', -1)
       ELSE NULL END AS column_three
FROM
  strings

请在此处看到小提琴.