用逗号将一个字符串拆分成列

Split one string with commas into columns

例如,我有以下table:

| Block                       |
| abcdefgh,12kjkjkj,231wewoxyz|

如何将其转换为:

| Block1   | Block2   | Block3     |
| abcdefgh | 12kjkjkj | 231wewoxyz |

注意: - 每个 "Block" 最多有 8 个逗号(因此可以分成 9 个较小的块)。逗号的数量各不相同;有些有 8 个逗号,有些有 4 个,有些有 7 个,等等。每个较小的块将占据一列。

顺便说一句,我使用 Presto。

谢谢!

在我看来,您只需使用 split_part 函数来创建您的列,如下所示:

SELECT
    split_part(Block, ',', 1) AS Block1,
    split_part(Block, ',', 2) AS Block2,
    split_part(Block, ',', 3) AS Block3,
    split_part(Block, ',', 4) AS Block4,
    split_part(Block, ',', 5) AS Block5,
    split_part(Block, ',', 6) AS Block6,
    split_part(Block, ',', 7) AS Block7,
    split_part(Block, ',', 8) AS Block8,
    split_part(Block, ',', 9) AS Block9
FROM
    your_table