postgressql 按符号切割字符串 从单列到多列
split_part(channel, '/', 1) AS channel1
, split_part(channel, '/', 2) AS channel2
, split_part(channel, '/', 3) AS channnel3

分完之后的结果 是这个样子
split_part(channel, '/', 1) AS channel1
, split_part(channel, '/', 2) AS channel2
, split_part(channel, '/', 3) AS channnel3

分完之后的结果 是这个样子