#453 Added PostgreSQL initial db scripts (User) (#556)

* PostgreSQL initial commit of translation from SQL Server to PostgreSQL

* snake_case added.
set search path for schema.  schema qualified name no longer needed for creation and access of functions.

* Table DDL for PostgreSQL

src/Sql/PostgreSQL/Functions/user_search.sql

@@ -0,0 +1,30 @@
+DROP FUNCTION IF EXISTS user_search;
+
+CREATE OR REPLACE FUNCTION user_search 
+(
+    _email VARCHAR(50),
+    _skip  INT DEFAULT 0,
+    _take  INT DEFAULT 25
+)
+RETURNS SETOF user_view
+LANGUAGE 'plpgsql'
+AS
+$BODY$
+DECLARE 
+    email_like_search VARCHAR(55) = _email || '%';
+
+BEGIN
+    RETURN QUERY
+    SELECT
+        *
+    FROM
+        user_view
+    WHERE
+        email IS NULL 
+    OR 
+        email LIKE email_like_search
+    ORDER BY email ASC
+    OFFSET _skip ROWS
+    FETCH NEXT _take ROWS only;
+end
+$BODY$