Trying to alter a table in SQL Server. I want to add a unique constraint to a column called Names in table ReportingItemNames:
ALTER TABLE ReportingItemNames
ADD CONSTRAINT UC_ReportingItemNames$Name UNIQUE ([ReportingItemNames,Name])
But I am getting this error:
Column name 'ReportingItemNames,Name' does not exist in the target table or view
Where am I going wrong?
Use this:
ALTER TABLE ReportingItemNames
ADD CONSTRAINT UC_ReportingItemNames UNIQUE ([Name])
You can refer to ALTER TABLE (Transact-SQL) documentation for more information.
Shouldn't it be:
ALTER TABLE ReportingItemNames
ADD CONSTRAINT UC_ReportingItemNames$Name UNIQUE ([Name])
Related
Hey guys just wondering what i'm doing wrong in this script.
ALTER TABLE SSV_TOURS (
ADD CRUISE_ID# CHAR(5),
ADD CONSTRAINT TOURS_CRUISEID#_FK FOREIGN KEY (CRUISE_ID#) REFERENCES SSV_CRUISES(CRUISE_ID#)
);
When i do the ADD commands individually the table alters, so I'm not really sure what I'm doing wrong. Thanks in advance
In Oracle, alter table only allows one modification at a time. You can see this in the syntax diagram in the documentation: There are no back arrows.
So:
ALTER TABLE SSV_TOURS ADD CRUISE_ID# CHAR(5);
ALTER TABLE SSV_TOURS ADD CONSTRAINT TOURS_CRUISEID#_FK FOREIGN KEY (CRUISE_ID#) REFERENCES SSV_CRUISES(CRUISE_ID#);
I think you can't mix column_clause and constraint_clause in one alter table sentence. However in your case you either need to split your alter table to two (one with add column and other with add constraint) or slightly rewrite your statement as
ALTER TABLE SSV_TOURS (
ADD CRUISE_ID# CHAR(5)
CONSTRAINT TOURS_CRUISEID#_FK FOREIGN KEY (CRUISE_ID#)
REFERENCES SSV_CRUISES(CRUISE_ID#)
);
I don't understand the logic in Derby syntax.
I'm new to SQL, I'm learning now.
I needed to alter a column constraint. I needed to add "not null".
Since I already did an alter on a column for the constraint unique, I thought the syntax will be the same since they are both constraints.
I finally found for not null this link Cannot alter column in existing table in java Derby database
and as I say the same syntax doesn't work for adding a unique constraint to the same column, so my question is: how is the syntax changed for each constraint?
This works:
ALTER TABLE WALLETUSER ALTER COLUMN WALLETUSERNAME NOT NULL;
So why does this not work?
ALTER TABLE WALLETUSER ALTER COLUMN WALLETUSERNAME unique;
And why does this work:
alter table customer add constraint cu1 unique (cust_name);
but this does not:
alter table customer add constraint not null (cust_name);
I create a table
create table CARS{
CAR_ID NUMBER(10), CONSTRAINT X_CAR_ID NOT NULL
}
and now I want to change the name of the constraint, so I drop the constraint:
ALTER TABLE CARS DROP CONSTRAINT X_CAR_ID;
This works correclty but, when I tried to add new constraint I have a problem,
my query:
ALTER TABLE CARS ADD CONSTRAINT XX_CAR_ID (CAR_ID) NOT NULL;
I thought that query, will be working correctly, but I get only error report:
Error report -
SQL Error: ORA-00904:
How to add correctly this constraint ?
While I couldn't test it I believe the statement below is what you want:
ALTER TABLE CARS MODIFY CAR_ID CONSTRAINT XX_CAR_ID NOT NULL;
Oracle uses the modify keyword in this context.
To rename it without dropping first you would use:
alter table cars rename constraint x_car_id to xx_car_id;
See the reference for more info.
I'm trying to put check constraint on existing column.
Is there any way to achieve this from PostgreSQL?
Use alter table to add a new constraint:
alter table foo
add constraint check_positive check (the_column > 0);
More details and examples are in the manual:
http://www.postgresql.org/docs/current/static/sql-altertable.html#AEN70043
Edit
Checking for specific values is done in the same way, by using an IN operator:
alter table foo
add constraint check_positive check (some_code in ('A','B'));
If you are okay with (or want) Postgres to generate a constraint name you can use the following shorthand syntax.
ALTER TABLE foo
ADD CHECK (column_1 > 2);
You can add a new constraint with with alter table command. From documentation this example:
ALTER TABLE distributors
ADD CONSTRAINT zipchk CHECK (char_length(zipcode) = 5) NO INHERIT;
You will have to replace constraint name as well as table name and content by your local requirements.
This should do it:
create table test (
id serial
);
alter table test
add constraint id_not_null
check (id is not null);
I am trying to add primary key to newly added column in existing table name Product_Details.
New Column added: Product_Detail_ID (int and not null)
I am trying add primary key to Product_Detail_ID (please note: there are no other primary or foreign key assigned to this table)
I am trying with this query but getting error.
ALTER TABLE Product_Details
ADD CONSTRAINT pk_Product_Detils_Product_Detail_ID PRIMARY KEY(Product_Detail_ID)
GO
Error:
The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'dbo.Product\_Details' and the index name 'pk\_Product\_Detils'. The duplicate key value is (0).
Am I missing something here? I am using SQL Server 2008 R2. I would appreciate any help.
If you want SQL Server to automatically provide values for the new column, make it an identity.
ALTER TABLE Product_Details DROP COLUMN Product_Detail_ID
GO
ALTER TABLE Product_Details ADD Product_Detail_ID int identity(1,1) not null
GO
ALTER TABLE Product_Details
add CONSTRAINT pk_Product_Detils_Product_Detail_ID primary key(Product_Detail_ID)
GO
In mysql, I was able to achieve with following query
ALTER TABLE table_name ADD new_column int NOT NULL AUTO_INCREMENT primary key
Add Primary Key to First Position
ALTER TABLE table_name
ADD column_name INT PRIMARY KEY AUTO_INCREMENT FIRST;
Reference: Stack Overflow | Tech On The Net
You are getting the error because you have existing data that does not fullfill the constraint.
There are 2 ways to fix it:
clean up the existing data before adding the constraint
add the constraint with the "WITH NOCHECK" option, this will stop sql server checking existing data, only new data will be checked
ALTER TABLE Jaya
ADD CONSTRAINT no primary key(No);
here Jaya is table name,
no is column name,
ADD CONSTRAINT is we giving the primary key keyword
If you want to add a new column say deptId to the existing table say department then you can do it using the below code.
ALTER TABLE department ADD COLUMN deptID INT;
it will create your new column named deptID.
now if you want to add constraint also along with new column while creating it then you can do it using the below code. In the below code I am adding primary key as a constraint. you can add another constraint also instead of primary key like foreign key, default etc.
ALTER TABLE department ADD COLUMN deptID INT NOT NULL ADD CONSTRAINT PRIMARY KEY(deptID);
k. friend
command:
sql> alter table tablename add primary key(col_name);
ex: alter table pk_Product_Detils add primary key(Product_Detail_ID);