How to find the rank lowest for each student using a Select query?

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• How to find the child level for each table in a relational model?

  Earthlings,
  
  I need your help, and I know that, "Yes, we can change." Change this thread to a question answered.
  
  So: How to find the child level for each table in a relational model?
  
  I have a database of relacional (9.2), all right?
  

  .
       O /* This is a child who makes N references to each of the follow N parent tables (here: three), and so on. */
      /↑\ Fks
     O"O O" <-- level 2 for first table (circle)
    /↑\ Fks
  "o"o"o" <-- level 1 for middle table (circle)
     ↑ Fk
    "º"

  Tips:
  -Each circle represents a table;
  -Red no tables have foreign key
  -the picture on the front line of tree, for example, a level 3, but when 3 becomes N? How is N? That is the question.
  
  I started to think about the following:
  
  First of all, I need to know how to take the kids:

  select distinct child.table_name child
    from all_cons_columns father
    join all_cons_columns child
   using (owner, position)
    join (select child.owner,
                 child.constraint_name fk,
                 child.table_name child,
                 child.r_constraint_name pk,
                 father.table_name father
            from all_constraints father, all_constraints child
           where child.r_owner = father.owner
             and child.r_constraint_name = father.constraint_name
             and father.constraint_type in ('P', 'U')
             and child.constraint_type = 'R'
             and child.owner = 'OWNER') aux
   using (owner)
   where child.constraint_name = aux.fk
     and child.table_name = aux.child
     and father.constraint_name = aux.pk
     and father.table_name = aux.father;

  Thought...
  We will share!
  
  Thanks in advance,
  Philips
  
  Published by: BluShadow on April 1st, 2011 15:08
  formatting of code and hierarchy for readbility

  Have you looked to see if there is a cycle in the graph of dependence? Is there a table that has a foreign key to B and B has a back of A foreign key?

  SQL> create table my_emp (
    2    emp_id number primary key,
    3    emp_name varchar2(10),
    4    manager_id number
    5  );
  
  Table created.
  
  SQL> ed
  Wrote file afiedt.buf
  
    1  create table my_mgr (
    2    manager_id number primary key,
    3    employee_id number references my_emp( emp_id ),
    4    purchasing_authority number
    5* )
  SQL> /
  
  Table created.
  
  SQL> alter table my_emp
    2    add constraint fk_emp_mgr foreign key( manager_id )
    3         references my_mgr( manager_id );
  
  Table altered.
  
  SQL> ed
  Wrote file afiedt.buf
  
    1   select level lvl,
    2          child_table_name,
    3          sys_connect_by_path( child_table_name, '/' ) path
    4     from (select parent.table_name      parent_table_name,
    5                  parent.constraint_name parent_constraint_name,
    6                  child.table_name        child_table_name,
    7                  child.constraint_name   child_constraint_name
    8             from user_constraints parent,
    9                  user_constraints child
   10            where child.constraint_type = 'R'
   11              and parent.constraint_type = 'P'
   12              and child.r_constraint_name = parent.constraint_name
   13           union all
   14           select null,
   15                  null,
   16                  table_name,
   17                  constraint_name
   18             from user_constraints
   19            where constraint_type = 'P')
   20    start with child_table_name = 'MY_EMP'
   21*  connect by prior child_table_name = parent_table_name
  SQL> /
  ERROR:
  ORA-01436: CONNECT BY loop in user data
  

  If you have a cycle, you have some problems.

  (1) it is a NOCYCLE keyword does not cause the error, but that probably requires an Oracle version which is not so far off support. I don't think it was available at the time 9.2 but I don't have anything old enough to test on

  SQL> ed
  Wrote file afiedt.buf
  
    1   select level lvl,
    2          child_table_name,
    3          sys_connect_by_path( child_table_name, '/' ) path
    4     from (select parent.table_name      parent_table_name,
    5                  parent.constraint_name parent_constraint_name,
    6                  child.table_name        child_table_name,
    7                  child.constraint_name   child_constraint_name
    8             from user_constraints parent,
    9                  user_constraints child
   10            where child.constraint_type = 'R'
   11              and parent.constraint_type = 'P'
   12              and child.r_constraint_name = parent.constraint_name
   13           union all
   14           select null,
   15                  null,
   16                  table_name,
   17                  constraint_name
   18             from user_constraints
   19            where constraint_type = 'P')
   20    start with child_table_name = 'MY_EMP'
   21*  connect by nocycle prior child_table_name = parent_table_name
  SQL> /
  
         LVL CHILD_TABLE_NAME               PATH
  ---------- ------------------------------ --------------------
           1 MY_EMP                         /MY_EMP
           2 MY_MGR                         /MY_EMP/MY_MGR
           1 MY_EMP                         /MY_EMP
           2 MY_MGR                         /MY_EMP/MY_MGR
  

  (2) If you try to write on a table and all of its constraints in a file and do it in a valid order, the entire solution is probably wrong. It is impossible, for example, to generate the DDL for MY_EMP and MY_DEPT such as all instructions for a table come first, and all the instructions for the other are generated second. So even if NOCYCLE to avoid the error, you would end up with an invalid DDL script. If that's the problem, I would rethink the approach.

  -Generate the DDL for all tables without constraint
  -Can generate the DDL for all primary key constraints
  -Can generate the DDL for all unique key constraints
  -Can generate the DDL for all foreign key constraints

  This is not solidarity all the DOF for a given in the file object. But the SQL will be radically simpler writing - there will be no need to even look at the dependency graph.

  Justin

• SQL - find the minimum value for each separate record...

  Hi all
  
  I have a table like this in SQL Server
  
  Date of sale of product
  A date
  A date
  A date
  B date of
  B date of
  C date
  C date
  C date
  
  I would like to write a query to find the minimum date (i.e. the date
  the first sale) for each product
  
  Thus, the expected results would be
  
  Date of sale of product
  A date min
  B date of min
  C date of min
  
  How can I do this using SQL Server?
  
  any help is greatly appreciated!
  
  Thank you!
  
  

  Product SELECTION, MIN (sale_date)
  From your_table
  GROUP BY product

  Etienne

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  Can not find the audio driver for my HP laptop...

  I bought the new elegant book, model no HP. Elegant Pavilion book 15th-b001
  
  After 2-3 months, I found my laptop speakers weren't working and its got very slow. I couldn't do so I kept using headphones.
  recently, I've run the driverpack and accidentally a few update audio driver and voice my laptop has increased incredibly, I was surprised, it was very good,
  
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  Pls how I find the 3G module in my NB200 - PLL20E?

  Thank you

  Hello

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  Hi all

  I'm new in APEX, so pls forgive my question, if it's simple, but I am struggling with this problem for days now. I have interactive report and you want to add button in each row. What I want to do with this button is the following:

  1. to execute some stored procedure in need of that particular line item values

  2. returns a (id)

  3. go in another page in the application by passing the value out of the procedure (id).

  and I'm not find the way to do it. I tried now means:

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  and I'm stuck...

  I just forms and global report and probably still think the "wrong" way .

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  Thank you!!!

  
  

  user3253917 wrote:

  Please update your forum profile with a real handle instead of 'user3253917 '.

  I request of the company: there is a customer who always orders the same standard product orders (always order the same products, fair amount is different). I want to make it simple for the user: instead of retyping the command (master and few records details every time yet) I want to copy selected command (copy of the master record and record details) so that the user will only change date order (in master record) and amount fields in record details).

  So, in order to give him:

  1. the user must be able to choose the order in which I would copy (at page 4), select it,

  2. I need to make PL/SQL procedure to insert the new master record (order) and a few record details (order_items) (copy of the order/order_items chosen in step 1)

  3. navigate the user to page 29, where the master account at stage 2 insterted appears, so that the user can change the date and quantities.

  Any solution will be highly appreciated! Thank you very much!!!

  In simple terms:

  1. Add a link to column "Command copies" in the report on page 4, which sets the COPY request and passes the order ID on page 29.
  2. On page 29, create a process before header, sequenced to be the first process executed and conditional on REQUEST be EXEMPLARY, which creates a new order as a copy of the order with the ID from page 4 and returns the ID of the new order in the PK command ID of 29 page element.

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  I have it here are four columns,
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  with All_files like)
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