Interface: HeidiSQL
Database: SQL Server
I'm trying to create table keeping ID (int) column as primary key as well as Auto_Increment.
But SQL Server is throwing Error 102:
Incorrect Syntax near 'Auto_increment'.
Please Help. Thanks.
The problem is that HeidiSQL will use the keyword AUTO_INCREMENT instead of IDENTITY. However AUTO_INCREMENT is not a valid specification for SQL Server CREATE TABLE statements. Here is how you do it:
CREATE TABLE "YourTableName"
(
"ID" INT NOT NULL IDENTITY(1,1)
PRIMARY KEY ("ID")
);
I didn't find a way to generate the CREATE TABLES with IDENTITY specification by using HeidiSQL. If someone does, please tell us.
In SQL Server, it's called an IDENTITY:
CREATE TABLE dbo.YourTAble
(
ID INT NOT NULL IDENTITY(1,1),
.............
)
The official MSDN documentation on CREATE TABLE contains all the possible options - that should always be your first place to look for answers like this ....
If you can use the SSMS (SQL Server Management Studio) as the GUI for database management tasks, you can change the ID column as an auto increment column by setting its Identity Specification attributes as follows
the problem is you forgot to add 'key' keyword.
the correct syntax is:
create table mytable (
first_col int primary key AUTO_INCREMENT
);
select * from mytable
Related
I have made multiple attempts at creating a SQL Server table to link to an Access front-end with 'disallow zero length value' constraints on the table but when I link the table up to my front-end the design of the table shows Allow Zero Length = Yes
Now I have tried various methods of trying to change this to No (I need it to be No for a migration project I am working on). I am not sure what needs to be done on the SQL Server to ensure that upon linking this table to my access front-end, this constraint is a No.
This is the Create script for my table:
Create Table Riku(
ID int NOT NULL PRIMARY KEY,
testtext varchar(255),
CONSTRAINT DissalowNulls
CHECK (testtext <> ''),
CONSTRAINT DissalowNull2
CHECK (LEN(testtext) = 0)
);
Neither of these two constraints work. I have tried using Nvarchar, Varchar, and Text as SQL Data Type all of which yielded this same result (Yes).
Any ideas?
You must indicate to the column that does not allow null
Create Table Riku(
ID int NOT NULL PRIMARY KEY,
testtext varchar(255) NOT NULL,
CONSTRAINT DissalowNulls
CHECK (testtext <> '')
);
I am interpreting your question as:
"Why is it when I create a constraint in SQL Server to 'DisalowNulls'
does it not appear that way when viewing the table properties in
Access?"
My answer to that questions is, "they are not syntax equivalent features". When Access interprets the design of the linked table it is not perceiving these as the same property. The constraint you created in SQL Server is more equivalent to an Access Validation Rule although that will also not appear in the Access table designer.
It would be nice if Access would disable properties that aren't relevant to the database type of the linked table. Other properties like Format, Input Mask, and Caption could also be in that category.
I want to make a query in witch it creates a simple table, In SQL that would be:
CREATE TABLE RealInventry (ID int IDENTITY(1,1) NOT NULL,PartNumber varchar(255),QTY varchar(255),Locator varchar(255))
I'm trying to do the same it Access DB, but I'm getting an error in "IDENTITY" syntax. How can I make this SQL query work on Access, I'm currently using Access 2013
Any help is appreciated.
Try Autoincrement instead of Identity:
CREATE TABLE test (ID AUTOINCREMENT NOT NULL,PartNumber varchar(255),QTY varchar(255),Locator varchar(255))
I have a test application coded in Java for creating an indexed and non indexed table in a MySQL, PostgreSQL, Oracle and Firebird database (Amongst other things).
Is it simply a case that PostgreSQL doesnt allow the auto increment feature? If not, what is the normal procedure for having an indexed coloumn?
Thanks in advance
You may use SERIAL in PostgreSQL to generate auto increment field,
For eg:-
CREATE TABLE user (
userid SERIAL PRIMARY KEY,
username VARCHAR(16) UNIQUE NOT NULL
)
This will create userid as auto-increment primary key indexed.
If you don't want this as primary key, just remove PRIMARY KEY.
Use a column of type SERIAL. It works the same way as AUTOINCREMEMT on some other DBs. (Check the docs for other features you can use with it.)
With current Postgres, you can just use SERIAL for the column type.
With older versions of Postgres, you can implement this using SEQUENCE; the relevant procedure is:
CREATE SEQUENCE mytable_myid_seq;
ALTER TABLE mytable ALTER COLUMN myid SET DEFAULT NEXTVAL('mytable_myid_seq');
A good article on this is MySQL versus PostgreSQL: Adding an Auto-Increment Column to a Table
I want to build an employees table using SQL SERVER 2008 , and in my table I want to have an ID for each employee .
I heared about GUID and I kind of understood that its a data type , But I couldn't use it
could you please show me the way to use it ...
by the way , lets say I want something like this :
CREATE TABLE Employees (
ID guid PRIMARY KEY,
Name NVARCHAR(50) NOT NULL
)
How can I do it ?? because I want to benefit from it , but I couldn't find out how to do that
It's not called GUID in SQL Server. It's called uniqueidentifier
The type is called UNIQUEIDENTIFIER as others have pointed out already. But I think you absolutely must read this article before proceeding: GUIDs as PRIMARY KEYs and/or the clustering key
They are called uniqueidentifier
Don't use uniqueidentifier as primary key if clustered (which is the default for PKs)
Seriously: use a standard IDENTITY instead
You can also consider using NEWSEQUENCIALID as the default value for your ID column as it would be faster than using NEWID() generate the GUIDs.
BUT (from the same link above):-
If privacy is a concern, do not use this function. It is possible to guess the value of the next generated GUID and, therefore, access data associated with that GUID.
Practical demo, FWIW
DECLARE #guid1 AS uniqueidentifier
SET #guid1 = NEWID()
SELECT #guid1
The GUID in sql server is known by UNIQUEIDENTIFIER data type. below is the desired code.
CREATE TABLE Employees
(
Id UNIQUEIDENTIFIER PRIMARY KEY,
Name NVARCHAR (50) not null
)
GO
In all my searching I see that you essentially have to copy the existing table to a new table to chance to identity column for pre-2008, does this apply to 2008 also?
thanks.
most concise solution I have found so far:
CREATE TABLE Test
(
id int identity(1,1),
somecolumn varchar(10)
);
INSERT INTO Test VALUES ('Hello');
INSERT INTO Test VALUES ('World');
-- copy the table. use same schema, but no identity
CREATE TABLE Test2
(
id int NOT NULL,
somecolumn varchar(10)
);
ALTER TABLE Test SWITCH TO Test2;
-- drop the original (now empty) table
DROP TABLE Test;
-- rename new table to old table's name
EXEC sp_rename 'Test2','Test';
-- see same records
SELECT * FROM Test;
we cannot add identity to an existing column using sql command but we can do it using GUI.
Right click on the table - design - select the column on which you want to add identity.
go to the properties available below. find the identity specification and set it to yes.
save the table.
if it is not saved the go to tools from the menu - options - table designer - uncheck the checkbox prevent saving changes. now you can save the table modifications.
now your existing table had identity.
In all of the new feature documents I read about 2008, adding identity to an existing column was not a feature I recall. The solution you've found is correct and I think the process of adding identity increment to a column automatically would be only rarely useful.
Well you can do something like this.
ALTER TABLE my_table ADD ID_COLUMN INT IDENTITY (1,1) NOT NULL
You can add the IDENTITY property to an existing column using the GUI of Enterprise Manager / Management Studio.
In SQL 2005 and earlier, you could not modify an existing column to become an identity column. I deem it very very unlikely that MS changed that in 2008.