Please help me to have some knowledge on this

Question

Can any one give me 'a model of blue print along with some examples of gaps and it's solution in the project'? Please help me to have some knowledge on this.

Answer 1

/* Formatted on 8/27/2012 9:54:40 AM (QP5 v5.185.11230.41888) */
WITH t AS (SELECT 'a-->b-->c-->d' tree FROM DUAL),
     t1
     AS (    SELECT REGEXP_SUBSTR (tree,
                                   '[^-->]+',
                                   1,
                                   LEVEL)
                       parent,
                    REGEXP_SUBSTR (tree,
                                   '[^-->]+',
                                   1,
                                   LEVEL + 1)
                       child,
                    LEVEL lvl
               FROM t
         CONNECT BY LEVEL <= REGEXP_COUNT (tree, '-->') + 1)
    SELECT DISTINCT PRIOR parent || '-->' || parent PATH
      FROM t1
     WHERE PRIOR parent IS NOT NULL
CONNECT BY PRIOR lvl < lvl
c-->d
a-->d
a-->b
b-->d
b-->c
a-->c