Add Word Count for a Column as a postgres til.

README.md

@@ -44,6 +44,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 
 - [Timestamp Functions](postgres/timestamp-functions.md)
 - [Turning Timing On](postgres/turning-timing-on.md)
+- [Word Count for a Column](postgres/word-count-for-a-column.md)
 
 ### rails
 

postgres/word-count-for-a-column.md

@@ -0,0 +1,21 @@
+# Word Count for a Column
+
+Assuming I have a database with a posts table:
+
+```
+> select * from posts where id = 1;
+ id |  title   |              content               
+----+----------+------------------------------------
+  1 | My Title | This is the content of my article. 
+```
+
+I can compute the word count of the content of a given post like so:
+
+```
+> select sum(array_length(regexp_split_to_array(content, '\s+'), 1)) from posts where id = 1;
+ sum 
+-----
+   7 
+```
+
+[source](http://blog.lingohub.com/2013/07/sql-word-count-character-count-postgres/)