Add Constructing A Range Of Dates as a postgres til

Author: jbranchaud

README.md

@@ -132,6 +132,7 @@ _310 TILs and counting..._
 - [Checking The Type Of A Value](postgres/checking-the-type-of-a-value.md)
 - [Compute Hashes With pgcrypto](postgres/compute-hashes-with-pgcrypto.md)
 - [Configure The Timezone](postgres/configure-the-timezone.md)
+- [Constructing A Range Of Dates](postgres/constructing-a-range-of-dates.md)
 - [Count Records By Type](postgres/count-records-by-type.md)
 - [Create A Composite Primary Key](postgres/create-a-composite-primary-key.md)
 - [Create hstore From Two Arrays](postgres/create-hstore-from-two-arrays.md)

postgres/constructing-a-range-of-dates.md

@@ -0,0 +1,17 @@
+# Constructing A Range Of Dates
+
+PostgreSQL offers a number of range types including the `daterange` type.
+This can be constructed using the `daterange()` function with two strings
+representing the lower and upper bounds of the date range respectively.
+
+```sql
+> select daterange('2015-1-1','2015-1-5');
+        daterange
+-------------------------
+ [2015-01-01,2015-01-05)
+```
+
+The lower bound is inclusive -- indicated by the `[` character -- and the
+upper bound is exclusive -- indicated by the `)` character.
+
+[source](http://www.postgresql.org/docs/current/static/rangetypes.html)