Use COALESCE instead of CASE for more concise query.

pg/fill-abook.sql

@@ -4,14 +4,8 @@ CREATE TABLE
     abook (count, name, address)
 AS SELECT
     DISTINCT ON(lower(address))
-    CASE WHEN
-        named.count IS NULL THEN 1
-        ELSE named.count
-    END,
-    CASE WHEN
-        named.name IS NULL THEN lower(unnamed.address)
-        ELSE named.name
-    END,
+    COALESCE(named.count, 1),
+    COALESCE(named.name, lower(unnamed.address)),
     lower(unnamed.address)
 FROM
     contact unnamed
@@ -26,7 +20,8 @@ LEFT OUTER JOIN (
     WHERE
         name != ''
     GROUP BY
-        lower(address), name
+        lower(address),
+        name
     ORDER BY
         lower(address),
         count DESC,