Add Escaping String Literals With Dollar Quoting as a postgres til

postgres/escaping-string-literals-with-dollar-quoting.md

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+# Escaping String Literals With Dollar Quoting
+
+String literals in PostgreSQL are defined by surrounding the content with
+the `'` character. For string literals that contain the `'` character, you
+may have seen it escaped with a preceding `'`.
+
+```sql
+> select 'Isn''t this nice?';
+     ?column?
+------------------
+ Isn't this nice?
+```
+
+This is easy enough to do, but can be error prone and doesn't work well if
+SQL is being programmatically generated. A great workaround is to escape
+string literals using what is called dollar quoting.
+
+```sql
+> select $$Isn't this even nicer?$$;
+        ?column?
+------------------------
+ Isn't this even nicer?
+```
+
+Just wrap both ends in `$$` instead of `'`.
+
+[source](https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html)