Most of the RA stuff works now.

Need to fix up the compilation to return a query ready for value substitution
by the jdbc stuff, or something (rather than embedding parameters in the
query).

Also need to add insert!, update! and delete! functions.

1 files changed, 28 insertions, 2 deletions

diff --git a/README.md b/README.md
index 7b454a1..5e58b6b 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,36 @@
 # clojure-sql
 
-A Clojure library designed to ... well, that part is up to you.
+A DSL for [Clojure][1] to compose queries using the constructs of [Relational
+Algebra][2]. The RA constructs are then compiled into an SQL query to be run on
+a DBMS.
+
+`clojure-sql` provides some utility functions beyond strict RA to allow for
+data to be inserted, updated and deleted.
+
+`clojure-sql` provides no mechanism to create database schemas.
+
+[1]: http://clojure.org/
+[2]: http://en.wikipedia.org/wiki/Relational_Algebra
 
 ## Usage
 
-FIXME
+    (require '[clojure.sql :as s])
+
+    (-> (s/table :users)
+        (s/project [:id :username])
+        deref)
+    ; => "SELECT \"users\".\"id\", \"users\".\"username\" FROM \"users\""
+
+    (-> (s/table {:users :u})
+        (s/project [:id :username])
+        (s/rename {:id :uid})
+        (s/join (-> (s/table {:people :p})
+                    (s/project {:id :pid, :fname :first})
+                    (s/select '(= :first "Henry")))
+                '(= :uid :pid))
+        (s/project [:username])
+        deref)
+    ; => "SELECT \"u\".\"username\" FROM \"users\" AS \"u\" JOIN \"people\" AS \"p\" ON (\"u\".\"id\" = \"p\".\"id\") WHERE (\"p\".\"fname\" = 'Henry')"
 
 ## License