split_part(channel, '/', 1) AS channel1 , split_part(channel, '/', 2) AS channel2 , split_part(channel, '/', 3) AS channnel3
分完之后的結果 是這個樣子
split_part(channel, '/', 1) AS channel1 , split_part(channel, '/', 2) AS channel2 , split_part(channel, '/', 3) AS channnel3
分完之后的結果 是這個樣子
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