DDL generation gets the CHECK constraint on each column in each table

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  Hi Experts,

  I have obligation to create a check on a column constraint (Number (6.2)) is where in the max value must be less than 4000.

  But the column already has the data of more than 4000. Also, I can't delete the data that is already present in the table.

  I'm just using an alter command

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  Can you suggest me work around him?

  Kind regards

  RV

  Hello

  RV says:

  Hi Experts,

  I have obligation to create a check on a column constraint (Number (6.2)) is where in the max value must be less than 4000.

  But the column already has the data of more than 4000. Also, I can't delete the data that is already present in the table.

  I'm just using an alter command

  SQL > alter table test add constraint CC_A (one check<>

  Error is:

  SQL error: ORA-02293: cannot validate (CC_A) - violated check constraint

  02293 00000 - "can't validate (s.%s) - violated check constraint.

  * Cause: an alter table operation tried to validate a check constraint to

  populated table that has nocomplying values.

  Can you suggest me work around him?

  Kind regards

  RV

  You can specify NOVALIDATE ACTIVATE when you create the constraint.

  ALTER TABLE test

  ADD CONSTRAINT cc_a CHECK (one<>

  ENABLE NOVALIDATE

  ;

  The constraint does not apply to the values already in the table, but if you update a column where the condition is violated, the constraint applies to the new value.

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  Hello
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  create table 
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  Chanchal Wankhade wrote:
  Hello

  SQL> create table table_name (id number, tdate date check (jdate < sysdate));
  create table table_name (id number, tdate date check (jdate < sysdate))
  *
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  There are some workaround solutions...

  And to add, that your mistake here is different - you're talking about another column JDATE (typo..?) in the check constraint... The actual column name is ADATE... :)

  Published by: JAC on December 5, 2012 19:15

• modify the check constraint

  Hello friends...
  I want to edit the check constraint... It is possible to modify the check constraint?
  
  
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  name of the constraint that is already in use
  
  
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  Check the document.

  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14200/statements_3001.htm#i2103997

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  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

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