Add Two Ways To Escape A Quote In A String as a Postgres til

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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@@ -630,6 +630,7 @@ _1141 TILs and counting..._
 - [Truncate Tables With Dependents](postgres/truncate-tables-with-dependents.md)
 - [Turning Timing On](postgres/turn-timing-on.md)
 - [Two Ways To Compute Factorial](postgres/two-ways-to-compute-factorial.md)
+- [Two Ways To Escape A Quote In A String](postgres/two-ways-to-escape-a-quote-in-a-string.md)
 - [Types By Category](postgres/types-by-category.md)
 - [Union All Rows Including Duplicates](postgres/union-all-rows-including-duplicates.md)
 - [Use A psqlrc File For Common Settings](postgres/use-a-psqlrc-file-for-common-settings.md)

postgres/two-ways-to-escape-a-quote-in-a-string.md

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+# Two Ways To Escape A Quote In A String
+
+String literals in PostgreSQL have to be wrapped in single quotes. This can be
+tricky if you are faced with writing out a query using a string that contains a
+single quote.
+
+```sql
+> select 'who's on first?';
+...
+```
+
+The query won't execute because it is waiting for you to close the second set
+of quotes.
+
+I know of two ways to handle this situation.
+
+The first is to put two single quotes back to back. The first will cause the
+second to be escaped so that the quote shows up in the string.
+
+```sql
+> select 'who''s on first?';
+    ?column?
+-----------------
+ who's on first?
+(1 row)
+```
+
+The second is to prepend the string with [the `E`
+character](https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS)
+to allow escape sequences in strings.
+
+```sql
+> select E'who\'s on first?';
+    ?column?
+-----------------
+ who's on first?
+(1 row)
+```
+
+[source](https://stackoverflow.com/a/12320729)