sql - Single text value which get unique value from all rows -


assume have these rows:

row 1 apple,watermelon,pineapple

row 2 apple,pineapple,orange

row 3 apple,blue berry

i want create single text value unique value rows.

how query?

expected result:

apple,watermelon,pineapple,orange,blue berry

try this:

select array_agg(val) (   select distinct unnest(string_to_array(my_column, ',')) val my_table) x

a breakdown of what's going on:

  • string_to_array() splits string, using specified delimiter, true array
  • unnest() turns array separate rows - 1 each element
  • distinct removes duplicate rows
  • array_agg() joins rows single csv string (typically group by clause, no need here there's 1 group)

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