My Configuration file:
# H2
spring.h2.console.enabled=true
spring.h2.console.path=/h2
# Datasource
spring.datasource.url=jdbc:h2:file:~/test
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
my data.sql script is something like :
CREATE TABLE IF NOT EXISTS people (
ID INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
vname varchar(255) not null
);
INSERT INTO people(vname) VALUES ('Chuck Norris');
When this is executed, INSERT fails with error :
cannot find 'VNAME' column.
Why is the column name auto all capsed? does that affect my INSERT command?
I just created the table, why cant INSERT find vname column?
Did you perhaps already create the table PEOPLE without the VNAME column? Your SQL won't touch it if the table already exists. Remove the database files and try again...
Related
I've got a bunch of tables with the 'serial' keyword on a primary key so that auto-increment will work. The problem is that I can make a query to insert a row using any id number which overrides the auto-increment. Is there a reason for this? Or, is there a way to prevent a user from adding/changing this value?
Here's an example of my table config:
create table if not exists departments (
department_id serial primary key,
name varchar(64) not null unique
);
if I run the following query, I can add any number to primary key:
insert into departments (department_id, name) values (9001, 'FooBar')
I think I want to prevent this from happening. I'd like to get some opinions.
Use an identity column:
create table if not exists departments (
department_id integer primary key generated always as identity,
name varchar(64) not null unique
);
This will prevent an insert to override the generated value. You can still circumvent that by specifying OVERRIDING SYSTEM VALUE as part of your INSERT statement. But unless you specify that option, providing a value for the column will result in an error.
Related: PostgreSQL: serial vs identity
Unless '9001' isn't already in the registers, it shouldn't cause any trouble.
If the filed 'department_id' is already auto increment you can just run your insert statement like
INSERT INTO departments (name) VALUES ('FooBar')
I'm using Microsoft sql server and you can control the insert of value in identity column by below sql command
SET IDENTITY_INSERT [ [ database_name . ] schema_name . ] table_name { ON | OFF }
By setting it to 'OFF' you cannot insert a value in identity column.
For more info refer: https://learn.microsoft.com/en-us/sql/t-sql/statements/set-identity-insert-transact-sql?view=sql-server-ver15
Hello and sorry for newbie question.
I have a very simple SSIS project that imports customer names from file. It all works now fine, however there are multiple entries of same name and I dont want duplicates.
This works just fine, however it populates duplicates:
CREATE TABLE [SLSales].[dbo].[Customer] (
id BIGINT IDENTITY NOT NULL PRIMARY KEY,
name NVARCHAR(100) NOT NULL
);
However, when I try to use this:
CREATE TABLE [SLSales].[dbo].[Customer] (
id BIGINT IDENTITY NOT NULL PRIMARY KEY,
name NVARCHAR(100) NOT NULL UNIQUE
);
All records fail and I get a mysterious -1071607685 error code.
The SSIS way is to:
Load the data from Source
GROUP BY [name] in your case because you can have same name in file
Run through a Lookup (Match and NoMatch outputs)
Insert No Match
Update matches (or in your case you might want to just ignore)
I have a Table A with 5 columns in DEV env and I want to copy 3 columns from that table into an existing (truncated) table in TEST env. How can i do this using Toad in Oracle database?
First create the database link. Following is the syntax :-
--Create database link
CREATE DATABASE LINK <dblinkname>
CONNECT TO <username> IDENTIFIED BY <password>
USING '(DESCRIPTION=
(ADDRESS=(PROTOCOL=TCP)(HOST=<hostname>)(PORT=<port_no>))
(CONNECT_DATA=(SERVICE_NAME=<servicename>)))';
Now i will demonstrate this by giving you one example
create table temp0
(
id number,
name varchar2(10)
);
--to be created in different environment
create table temp00
(
id number,
name varchar2(10)
);
insert into temp00 values(1,'roy');
insert into temp00 values(2,'nick');
Now,
insert into temp0(id) select(id) from temp00#dblinkname; --this will insert all the values of id in temp0 table from temp00 table
Now depending on your requirement, you can insert whatever columns you want by passing column names
I have a table viz. expenses with three columns as under
ExpenseId int NOT NULL,
ExpenseName varchar(50) NOT NULL,
Invalid bit NOT NULL
To add a new column (OldCode char(4) not null), I used design feature for tables in Microsoft SQL Server Management Studio. But I get following error
'Expenses' table
- Unable to modify table. Cannot insert the value NULL into column 'OldCode', table 'TransportSystemMaster.dbo.Tmp_Expenses'; column does not allow nulls. INSERT fails. The statement has been terminated.
Incidentally I have been able to add same column with same specifications to other tables of the same database.
Any help?
Your Table Consist of Existing Records
and you are pushing a new column of type NOT NULL.
so for older records the data have to be something.
try something like this
ALTER TABLE MY_TABLE ADD Column_name INT NULL
GO
UPDATE MY_TABLE <set valid not null values for your column>
GO
ALTER TABLE MY_TABLE ALTER COLUMN Column_name INT NOT NULL
GO
Since OldCode is NOT NULL, you should specify a default value for it.
when you have some rows on your table you can't add a column that is not nullable you should provide a default value for it
Alter Table table_name add OldCode int not null DEFAULT(0);
You have to specify values for all the 4 fields of the table, its purely because, while designing the table you set the definition of the columns to be not null. Again you are adding a new column called OldCode and setting to be not null, all ready existing records hasn't got a value. So that is the reason its complains
I'm attempting to alter a Derby database that has a table like this:
CREATE TABLE sec_merch_categories (
category_id int NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
packageName VARCHAR(100) NOT NULL,
name VARCHAR(100) NOT NULL,
primary key(category_id)
);
I'd like to change the category_id column to be:
category_id int NOT NULL GENERATED BY DEFAULT AS IDENTITY (START WITH 1, INCREMENT BY 1),
The only place I've seen that documents this is IBM's DB2, which advises dropping the expression, changing the integrity of the table, and adding the expression back. Is there anyway of doing this in Derby?
Thanks,
Andrew
You can create a new table with the schema you want (but a different name), then use INSERT INTO ... SELECT FROM ... to copy the data from the old table to the new table (or unload the old table and reload it into the new table using the copy-data system procedures), then use RENAME TABLE to rename the old table to an alternate name and rename the new table to its desired name.
And, as #a_horse_with_no_name indicated in the above comment, all of these steps are documented in the Derby documentation on the Apache website.