Create escape-single-quote.md

Author: feketegy

postgresql/escape-single-quote.md

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+# Escaping Single Quotes
+
+According to the SQL standard escaping single quotes should be done with another single quote.
+
+```sql
+INSERT INTO mytable (name) VALUES ('Shaquille O''Neal')
+```
+
+Note: See the two single quotes in `O''Neal`
+
+-----
+
+### Refs
+
+- [PostgreSQL Docs - String Constants](https://www.postgresql.org/docs/16/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS)