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In PostgreSQL, strings can be quoted very flexibly using a pair of dollar signs ($) with a tag in between. For example,

SELECT $f$ Hi $f$;

Is this quoting mechanism a part of any SQL standard, or is it postgres specific?

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NO its postgresql specific many programing languages offer a way to write text that avoids having to be escaped

consider

Select $$";"'\e\r\n$$ 

vs

select '\";\"\'\\e\\r\\n'

Also keep in mind Postgtesql from version 9.1 by default no longer allows passing escape string in a query, it has to have a leading E

select E'\r\n'  

to be escaped now see standard conforming string

  • consider vetting & sharing your code samples and expected output. I can't figure out what you're meaning to do with the 2nd example. perhaps start here and edit your answer with the updated link once it reflects the output you mean to show? – Peter Vandivier Dec 11 '19 at 14:40
  • the 2nd example is example is C style escaped string postgresql.org/docs/12/… with standard_conforming_string off – zsheep Dec 11 '19 at 15:31
  • I'm getting the same syntax error both locally and on shareable code with that set option. Might just be me borking it, but in general providing a rigorous minimal reproducible example will improve an answer – Peter Vandivier Dec 11 '19 at 15:43
  • it should work not sure why not Because doing select E'\' \r\n' does work of course doing the other method to escape ' works yet it did not escape slashes correctly either it returned double slashes. wonder if this behavior changed at some point and i missed it – zsheep Dec 11 '19 at 16:02

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