Constraint not null in several columns

Hello

I have a following the table with defination employee: -.

CREATE TABLE EMPLOYEE)

IDENTIFICATION NUMBER,

FIRST NAME VARCHAR2 (100),

MIDDLE_NAME VARCHAR2 (10),

VARCHAR2 (100) LAST_NAME,.

DATE OF BIRTH DATE);

My requirement is that I want to have a constraint not null on all 3 columns by name.

Something like

change table employee modify NVL (name, NVL (MIDDLE_NAME LAST_NAME)) not null;

How can I achieve this?

modify used table add constraint emp_ck01 check (coalesce (first_name, middle_name, last_name) is not null);

Tags: Database

Similar Questions

Addition of constraint not Null to a column that contains null values

All,
Could you please suggest me how to add the constraint not null to an existing column that has null values?

SQL > create table nn (number n, s varchar2 (10));

Table created.

SQL > insert into nn values (1, 'test');

1 line of creation.

SQL > insert into values nn (2 '');

1 line of creation.

SQL > commit;

Validation complete.

SQL > alter table nn edit n number not null;

Modified table.

SQL > nn desc;

Name                                      Null?    Type

----------------------------------------- -------- ----------------------------

N NUMBER NOT NULL

S                                                          VARCHAR2(10)

SQL > alter table nn edit n number null.

Modified table.

SQL > nn desc;

Name                                      Null?    Type

----------------------------------------- -------- ----------------------------

N                                                  NUMBER

S                                                  VARCHAR2(10)

SQL > alter table nn change s varchar2 (10) not null;

ALTER table nn change s varchar2 (10) not null

*

ERROR on line 1:

ORA-02296: impossible to activate (SCOTT) - found null values

SQL >

Thank you

Use NOVALIDATE:

SQL > alter table nn change s varchar2 (10) not null;
ALTER table nn change s varchar2 (10) not null
*
ERROR on line 1:
ORA-02296: impossible to activate (SCOTT) - found null values

SQL >
SQL > alter table nn change s varchar2 (10) not null NOVALIDATE;

Modified table.

SQL > insert into values nn (3, null);
insert into nn values (3, null)
*
ERROR on line 1:
ORA-01400: cannot insert NULL into ('SCOTT'. "' NN '. » S »)

SQL > select * from nn;

N S
---------- ----------
1 test
2

SQL >

SY.

Please let me know how I can add a new column with a constraint not null, table already has data, without falling off the table... Please help me on this issue...

Hello
I have an emp_job_det with a, b, c columns table. Note that this TABLE ALREADY has DATA OF THESE COLUMNS
IAM now add a new column "D" with forced not null
Fistly I alter the table by adding the single column "D", if I do, the entire column would be created with alll of nulls for the column DEFAULT D
ALTER table emp_job_det Add number D; -do note not null CONSTRAINT is not added
Second... If I try to add the constraint not null, get an eoor as already conatained null values...
(GOLD)
In other words, if I put the query
ALTER table emp_job_det Add number D NOT NULL; -THROWS ERROR AS TABLE ALREADY CONTAINS DATA
So my question is how how can I add a new column with a constraint not null, table already has the data, without falling off the table
Please help me on this issue...

Add the column without constraint, then fill the column. Once all the rows in the table are given in the new column, and then add the constraint not null.

Not Null on the column of a primary key constraint
I came across a table defined in the same way to...

create table t (t_id int constraint nn_t_id not null constraint pk_t primary, data key number);

Of course, the primary key is the is not null, then is there a reason to add the redundant constraint not null?
There are two parts to your question, I think:

(1) why add a NOT NULL if a primary key is also reported.
(2) why is null is NOT a name defined by the user (in this case nn_t_id).

1 > I think you are right: there is no difference in behavior in the way that Oracle is going to reject the creation of NULL in this column (whether through the direct insert or update with a NULL value). I personally always declares the NOT NULL for columns, I know to never have null, regardless of whether the column is (member of) a PK.

It's pretty funny, btw, the SQL standard as chosen able to be the NULL default value. I think that we all type much less, if the SQL standard chose NOT NULL default value. But that's another story.

2 > I don't see given nullability defined by the user of the explicit names now and then, because of some "coding guideline' which dictates that constraint names must never be generated System. This guideline is often presented as a result of the exception handling of "client-side", where the constraint name is filtered SQLERRM and then more personalized to be displayed to the end user. However for NOT NULL constraint violations, I think (does not fully to check) that you are always thrown an ORA-01400 is an ORA-01407. Who nowadays both will tell you exactly (in SQLERRM) which column of this table is currently in violation of a NOT NULL constraint.

Toon

How to add constraints not null

Data modeling Version 4.1.1.888 SQL
How to add constraints not null in sql modeling data and rename the default constraint name that is getting generated when marking column as required.

You can edit the template for the names of constraint not Null under properties-> setting->-> models naming standards. Change one marked 'not forced Null. Then, under preferences-> Data Modeler-> DDL, you must uncheck "generate short form constraint NOT NULL".

Is there a way to distinguish constraint not null null, out-of-line one online?

Dear maters,
Could you please help me to answer the question: How can we distinguish non-null online constraints (non-null column option) not null out-of-line ones (constraints, defined at the table level)? Below is an example of what I mean.
1. Create a table.
  CREATE TABLE TEST (ID NUMBER NOT NULL);
At this point, we have created a table with the constraint. The constraint was automatically created because of the option ' not null ' in the column definition. Say that the constraint name is SYS_C00699573. We can get the information about this user/all/dba_constraint or user/all/dba_cons_columns views.
1. ALTER table.
  ALTER TABLE TEST ADD CHECK ('ID' IS NOT NULL).
Here, we have created the second constraint as well. Say his name is SYS_C00699574. The only difference between them is that the first is online, and the second constraint is not. Is not only the terminology: If you file online - the 'NOT NULL' option also expires the DDL of the table. This is serious: for example, optimizer Oracle does not the id as nullable column either. If you drop the second - nothing like that happens. Oracle therefore somehow difference between online and offline constraints.
1. Drop out-of-line constraint. At this point the question arises: How can we distinguish who among the two constraints is online and who isn't? From dba_constraint/all/user or user/all/dba_cons_columns views constraints search exactly except their names.
Does anyone have an idea? Any help is very appreciated.
Thank you.

If you go here:

SELECT * FROM SYS. CDEF$ WHERE OBJ #= you_table_object_id

You can see the TYPE # is different, one is 7 (non-null) is 1 (check).

Add the constraint not NULL in the existing table that has null values

Hello
I want to add a constraint not null to and an existing table, but the table already contains values null in this column.
EMP
Emp_id name
1 axada
2
3 sdkdd
Here is already the data IE 2 empid is Null as name. I must add a fool of constraint not null which new values will not be null, but I don't want to change the data of exisitng alreadt which is null.

Hello

"The opposite": NOVALIDATE does not validate the data that is ALREADY in the table, but do not allow the insertion of a NULL value.

Have you tried my sample code?

CREATE TABLE MaTable (x NUMBER PRIMARY KEY, y NUMBER);

INSERT INTO myTable VALUES (1, 123);

INSERT INTO myTable VALUES ( 2, NULL );

INSERT INTO myTable VALUES (3, 456);

ALTER TABLE mytable MODIFY (y NOT NULL NOVALIDATE );

INSERT INTO myTable VALUES (4, 678);

INSERT INTO myTable VALUES ( 5, NULL );

SELECT * FROM MyTable;

'2' line was inserted with null before the creation of the NOT NULL constraint, this line remains "as what" at the end of the trial.

'5' line trying to insert a NULL value after creating the NOT NULL constraint, which is denied.

Best regards

Bruno.

The doc is correct on the constraint not null and scan limited index full?
Gave birth to the large [url http://forums.oracle.com/forums/thread.jspa?messageID=9313643] another thread:

Jonathan Lewis wrote:
>

I wasn't expecting to see because the doc said about scan limited index full "...". and at least one column in the index key has the NOT NULL constraint,"which would be foolish to say if the rowid was what filled that. There are currently only 2 factory codes and code 1 company (not nulls - Oracle does know that?), so I was kind of expected Oracle to reorder the predicates with an index skip scan. Take a fresh look on the doc, I wonder if I should not specify the company code in the query and maybe spend employee and job_number in the index. I hope it's obvious that this index has been added for other queries. This request could be taken out a change in the requirements of anyway, but I don't know when.
If you wear it as a separate thread, I'll take a look.
Can you give a reference to the manual - the comment you quoted may not be correct.
Just below where Hemant pointed to in the other thread, http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/indexiot.htm#sthref314

(Somehow I have the feeling that we had this conversation before, perhaps in a forum that no longer exists. "(Or was it all just a dream)."

Edit: Also seen in
http://download.Oracle.com/docs/CD/B28359_01/server.111/b28274/optimops.htm#i52044
http://download.Oracle.com/docs/CD/B14117_01/server.101/b10752/optimops.htm#51111
http://download.Oracle.com/docs/CD/F49540_01/doc/server.815/a67781/c20b_ops.htm#11004
http://download.Oracle.com/docs/CD/B19306_01/server.102/b14211/optimops.htm#i52044

and everything on the net.

Edited by: jgarry 26 January 2011 17:41
2nd edition: link fix that edit may 1 have ransacked.

Edited by: jgarry January 27, 2011 10:40
Joel,

I just had this 'already seen' (new) sense to speak of it.

Mentioning the reference 11.1 gave you:
This so obviously must be bad that I couldn't decide if I was proven wrong or was amazed to find that I couldn't he show the falsity. (Just because something is obvious, it does not mean it is true – Terry Pratchett.)

However, here is the obvious counter-example - that I came across 8.1.7.4 because it's the oldest version of Oracle that I have now:
```
create table t1
as
select
     rownum               id1,
     rownum               id2,
     rownum               id3,
     lpad(rownum,10,'0')     small_vc,
     rpad('x',100)          padding
from
     all_objects
where
     rownum <= 10000
;

create index t1_i1 on t1(id1, id2, id3);

begin
     dbms_stats.gather_table_stats(
          ownname           => user,
          tabname           =>'T1',
          cascade           => true

     );
end;
/

set autotrace traceonly explain

select
     /*+ index_ffs(t1) */
     id1, id3
from
     t1
where
     id2 = 99
;
```
No 'NOT NULL columns". But any line I will have a (non-null) value for id2, then it should be in the index - then Oracle should be able to do a full scan and get the right answer. Here is the map (I have no need of Council - but your configuration may be different):
```
Execution Plan
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=4 Card=1 Bytes=12)
   1    0   INDEX (FAST FULL SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=4 Card=1 Bytes=12)
```
If you change the predicate to: "id2 is zero", then the only legal path is an analysis.

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
http://www.jlcomp.demon.co.UK

+ "I believe in the evidence. I believe in observation, measurement and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wildest and most ridiculous something is, however, the firmer and more solid, the evidence should be. » +
Isaac Asimov

Count values not null for each column in a database
Hello

I need to write a routine that counts how many values a not null for each column in a database.
The first idea would be to loop on all_tables / all_tab_cols and write a select statement as
```
EXECUTE IMMEDIATE 'SELECT COUNT(*) FROM '||table_name||' WHERE '||column_name||' IS NOT NULL' INTO v_count;
```
However, this would mean a complete table for all columns not indexed scan. It's about when I have a maximum of 59 columns for a table with millions of rows.

A better idea? I don't have the exact number. For example, for the number of rows in a table, I just use all_tables.num_rows.

Concerning
Marcus
Ask the NUM_NULLS of the ALL_TAB_COLS column (and subtracting the total of the lines).

Constraint Unique NOT NULL in Data Modeling
I created unique constraints in the relational model and I am trying to figure out how to make a NOT NULL constraint.

Let's say the name of the table's category with cat_id, cat_name, sort columns.

I create in SQL 'category ALTER TABLE MODIFY (category CONSTRAINT NOT NULL xxx_cat_name_nn);', but there is no data entry point inside the Modeler in the [properties unique key - xxx_cat_name_nn] dialog box, that I can find, that allows me to tell him that it is a NOT NULL constraint. I'm sure that there is a way, but I just fall over my own feet, trying to find.

Any help would be greatly appricated.

Published by: 991065 on February 28, 2013 13:40
Hello

You can make the column NOT NULL by disabling the "Allow nulls" property for the column.
If you want a named STEP forced to NULL value, you must also set the property "Not Null Constraint Name" (under the default tab and the constraint of the column properties dialog box).

David

force a view column not null
I can't create a view with a column not null. Using this script, you can see that the resulting table is a constraint not null for the first column, even if the two columns of the source of this line are not null. Is anyway to force the view on the occasion of this first column as not null? (I need to ODP.NET if I get an error here)

DROP TABLE MYTABLE;

CREATE the table MYTABLE
(COL1 NUMBER (2) NOT NULL,)
col2 number (2));

drop table mytable2;

CREATE the MYTABLE2 table
(THE NUMBER (2) COLA NOT NULL,)
colB number (2));

create or replace view MYVIEW as select col1, col2 from mytable union select cola, colb from mytable2;

Bird DESC;
>
Is anyway to force the view on the occasion of this first column as not null?
>
No--and there's a related problem if you create a table with a view. For example, the table emp has empno as NOT NULL. I have a copy of the named emp1 emp where empno is also NOT NULL.
```
create or replace view v_emp as select empno from emp
```
A view on the highest describe statement shows empno as NOT NULL. But, as you've discovered if you ask another Union column will become NULLABLE in the view described.

The question is that if I use the view (on the single table of emp - no union or the second query) to create a table
```
create table t_emp as select * from v_emp
```
A describe on this table statement will show empno as NULLABLE.

SDDM EA1 named not null constraint
When I try to use named constraints not null in 3.1 EA1, they are not generated in the DDL export.
They are appointed in the physical model column properties dialog box, but they are not included in the generated DDL. Instead of the name, a line break seems to be generated.

When I try this in 3.0 named constraints are correctly generated in the DDL.

Is this a bug or something has changed between versions?
Hello

I suspect that the option 'generate short form of NOT NULL' is defined constraints (on the Data Modeler/DDL tools/preferences page) in your EA1 3.1 installation?

This option is selected, the name of the constraint to be omitted from the DDL.

David

Columns not null showing that nullable in the table grid
I use 2.1.0.63 sql developer.
I ran the following in my diagram
```
  CREATE TABLE EXCLUDE_DATA 
   (OWNER       VARCHAR2(30), 
    TABLE_NAME  VARCHAR2(30), 
       COLUMN_NAME VARCHAR2(30), 
       CONSTRAINT CK_OWNER CHECK (owner IS NOT NULL) ENABLE, 
       CONSTRAINT CK_TABLE_NAME CHECK (table_name IS NOT NULL) ENABLE
   );
 
 COMMENT ON TABLE EXCLUDE_DATA IS 'Tables and Columns to exclude from the column checker';
 COMMENT ON COLUMN EXCLUDE_DATA.OWNER IS 'The schema that contains the table';
 COMMENT ON COLUMN EXCLUDE_DATA.TABLE_NAME IS 'The table name to be excluded from the column checker';
 COMMENT ON COLUMN EXCLUDE_DATA.COLUMN_NAME IS 'The column on the table to be excluded.  If null then the whole table is excluded';

  CREATE UNIQUE INDEX UK_EXCLUDE_DATA ON EXCLUDE_DATA (OWNER, TABLE_NAME, COLUMN_NAME);
```
When the name of the table is selected, and the tab for the column that is selected in the main window it's showng columns as nullable (see below)
```
OWNER     VARCHAR2(30 BYTE)     Yes          1     The schema that contains the table
TABLE_NAME     VARCHAR2(30 BYTE)     Yes          2     The table name to be excluded from the column checker
COLUMN_NAME     VARCHAR2(30 BYTE)     Yes          3     The column on the table to be excluded.  If null then the whole table is excluded
```
The constraints are there however, it looks like a potential problem with just this window.
CeeJay

Adding a not null to a column check constraint does not have the non-nullable column.

Try instead this statement

CREATE TABLE EXCLUDE_DATA
(THE VARCHAR2 (30) IN OWNER NOT NULL,)
TABLE-NAME VARCHAR2 (30) NOT NULL,
COLUMN_NAME VARCHAR2 (30)
);

COMMENT on TABLE EXCLUDE_DATA IS "Tables and columns to exclude from the audit of the column;
COMMENT ON THE EXCLUDE_DATA COLUMN. OWNER IS 'of the schema that contains the table.
COMMENT ON THE EXCLUDE_DATA COLUMN. Table_name IS "the name of table to be excluded from the audit of the column;
COMMENT ON THE EXCLUDE_DATA COLUMN. Column_name IS ' column on the table to be excluded. If set to null, then the entire table is excluded. "

CREATE A UNIQUE UK_EXCLUDE_DATA ON EXCLUDE_DATA (OWNER, TABLE_NAME, COLUMN_NAME) INDEX;

The database AUTOMATICALLY adds check for columns NOT NULL constraints.

Hope this helps

Concerning
Chris

Not Null constraint question
Hello

I have an interface with 9 columns so the constraint not Null.
I use the SQL command Append, LKM SQL for SQL and Oracle CKM IKM for my execution.

In case one of the columns violate the constraint not null interface don't is not wrong on however the error message is entered in the error table.

My requirement is that, in the case where one of the lines violated the constraint not null all the interface must be wrong on and data must be entered in error or table SNP_CHECK_TAB table.

Kindly help me to solve this problem.

Thank you
Hello Nidhi,

You must also keep the constraints of primary for the columns at the database level, and then maintain control of flow in IKM
Then, interface will receive error

For example:
1400: 23000: java.sql.SQLException: ORA-01400: cannot insert NULL into ('SCOTT'. "" "" EMP_TEST_TGT '. "" EMPNO")

Flow control is used to identify records that are not valid and must be removed from circulation. 'Rejected' records are then inserted into the table to store data associated with errors (E$). Interface will not get IT just error here
capture files in the error table and inserts a valid records in the target table.

When you keep the flow control, yes it runs successfully and he traks records that violate the constraint rules
in the table "E$ _XYZ.

Thank you
katukota

Published by: katukota on September 8, 2009 19:07

Distinguish NOT NULL constraints Check constraints

Join user_constraints to user_cons_columns for constraint_type = 'C' indicates the Check constraints, and NOT NULL constraints, but also (because those are implemented as Check constraints).

My question is how to filter constraints NOT NULL to let only the 'normal Check constraints '?

I tried WHERE SUBSTR(search_condition,-12,12) & LT; & GT; 'IS NOT NULL '.
but as search_condition is of type LONG, I can't use substring.

Has anyone already found it? Thank you!!

ByronBarton wrote:

Has anyone already found it?

Well, there is no easy way. Simple, if you always create named* validation constraints. If so, online NOT NULL constraint will get name generated and forced check no:

SQL> create table test_tbl(
  2                        c1 number not null,
  3                        c2 number,
  4                        constraint test_tbl_chk1
  5                          check(
  6                                c2 is not null
  7                               )
  8                       )
  9  /

Table created.

SQL> select  constraint_name,
  2          generated
  3    from  user_constraints
  4    where table_name = 'TEST_TBL'
  5  /

CONSTRAINT_NAME                GENERATED
------------------------------ --------------
SYS_C008666                    GENERATED NAME
TEST_TBL_CHK1                  USER NAME

SQL>

However, if the check constraint is not named we:

SQL> create table test_tbl(
  2                        c1 number not null,
  3                        c2 number,
  4                        check(
  5                              c2 is not null
  6                             )
  7                       )
  8  /

Table created.

SQL> select  constraint_name,
  2          generated
  3    from  user_constraints
  4    where table_name = 'TEST_TBL'
  5  /

CONSTRAINT_NAME                GENERATED
------------------------------ --------------
SYS_C008668                    GENERATED NAME
SYS_C008669                    GENERATED NAME

SQL>

Then, the only way I know is:

SQL> column owner format a10
SQL> column table_name format a10
SQL> column column_name format a10
SQL> select  u.name owner,
  2          t.name table_name,
  3          a.name column_name,
  4          c.name constraint_name,
  5          decode(k.type#,7,'NOT NULL',1,'CHECK CONSTRAINT','UNKNOWN') type
  6    from  sys.USER$ u,
  7          sys.CON$  c,
  8          sys.CDEF$ k,
  9          sys.OBJ$ t,
 10          sys.COL$ a,
 11          sys.CCOL$ r
 12    where u.name   = user
 13      and c.owner# = u.user#
 14      and k.con#   = c.con#
 15      and t.obj#   = k.obj#
 16      and t.name   = 'TEST_TBL'
 17      and a.obj#   = t.obj#
 18      and r.col#   = a.col#
 19      and r.con#   = k.con#
 20      and r.obj# = k.obj#
 21  /

OWNER      TABLE_NAME COLUMN_NAM CONSTRAINT_NAME                TYPE
---------- ---------- ---------- ------------------------------ ----------------
SCOTT      TEST_TBL   C1         SYS_C008668                    NOT NULL
SCOTT      TEST_TBL   C2         SYS_C008669                    CHECK CONSTRAINT

SQL>

SY.