إلى أعضاء المنتدي الكرام

محتاج مساعدة في شرح هذا الكود


Copy specific columns (and rows) from one table to another:

Insert into postables
 (postable_id, postable_name, dept, auth_name) 
VALUES( 
 (Select postables_seq.nextval),
 (Select 'some static text' postable_name),
 (Select dept      From cost_centres Where cc_code = 123), 
 (Select auth_name From authorisers Where auth_code = 'Z5f')
)
[b]
-- The same as above written to select alias names:[/b]

insert into postables
 (postable_id, postable_name, dept, auth_name)
 (select AA,BB,CC,DD 
 from (Select postables_seq.nextval AA), 
   (Select 'some static text'    BB),
   (Select dept                  CC From cost_centres Where cc_code = 123),
   (Select auth_name             DD From authorisers Where auth_code = 'Z5f'));

معقول الكود صعب لدرجة دي
بس أعتقد انه مش بالصعوبة على محترفي أوركل بالموقع ولكن أعتقد أنهم مشغولين........... منتظر الردود

1- First the insert statements must be wrote as next to run successfully:

INSERT INTO postables
           (postable_id,
            postable_name,
            dept, auth_name
           )
    VALUES ((SELECT postables_seq.NEXTVAL
               FROM DUAL),
            (SELECT 'some static text' postable_name
               FROM DUAL),
            (SELECT dept
               FROM cost_centres WHERE cc_code = 123), (SELECT auth_name
                                       FROM authorisers WHERE auth_code = 'Z5f')
           );

INSERT INTO postables
           (postable_id, postable_name, dept, auth_name)
  (SELECT aa, bb, cc, dd
     FROM (SELECT postables_seq.NEXTVAL aa
             FROM DUAL),
          (SELECT 'some static text' bb
             FROM DUAL),
          (SELECT dept cc
             FROM cost_centres WHERE cc_code = 123),
          (SELECT auth_name dd
             FROM authorisers WHERE auth_code = 'Z5f'));

2-It is no difference between the 2 statements, their job is one and its inserting rows into a table.