根据多个分隔符拆分记录

Question

I am trying to prepare a query in PostgreSQL.

Below is my input:

Here you can find that in Field column has a unique value and Values column has values with multiple separators.

Now I want below output.

Here are the steps:

1. First value should be separated with ";" and generate new column with SplitFields
2. From Spitalfields we have to again separate it with ">>" and in that first value should be considered as Folder and Second Value should be considered as Value

How can I prepare the query?

I have prepared the same query in SQL server but in PostgreSQL, it didn't work for me as I have no idea about PostgreSQL.

Here is the query for SQL Server:

DECLARE @String varchar(1000)
SELECT
  @String = 'AV»ABC1; AC»ACTag; BB»BB1Tag; SampleInner»STag1; Not Privileged (RS)»Priv1tag; Winter 2015 Review»Windter1Tag'
SELECT
  *,
  LEFT(VALUE, CHARINDEX('»', VALUE) - 1) AS firstname,
  SUBSTRING(VALUE, CHARINDEX('»', VALUE) + 1, LEN(VALUE) - (CHARINDEX('»', VALUE) - 1)) AS lastname
FROM (SELECT
  SUBSTRING(';' + @String + ';', Number + 1,
  CHARINDEX(';', ';' + @String + ';', Number + 1) - Number - 1) AS VALUE
FROM master..spt_values
WHERE Type = 'P'
AND Number <= LEN(';' + @String + ';') - 1
AND SUBSTRING(';' + @String + ';', Number, 1) = ';') AS A

Answer 1

This is way easier in Postgres. You first need to split the string by ; to create the rows, then use string_to_array() to split up the second level

select field, 
       elements[1] as folder, 
       elements[2] as value
from (
   select t.field, "values", string_to_array(x.elements, '»') as elements
   from the_table t
      cross join unnest(string_to_array(t."values", ';')) as x(elements)
) x;

Or if you need to preserve the first level of "splitting":

select field, 
       splitfields,
       split_part(splitfields, '»', 1) as folder, 
       split_part(splitfields, '»', 2) as value 
from (
   select t.field, "values", x.splitfields
   from the_table t
      cross join unnest(string_to_array(t."values", ';')) as x(splitfields)
) x;

Online example: https://rextester.com/IOW62752