The task indicated this:
Create a table named automagic with the following fields:
An id field is an auto-incrementing serial field.
A name field that allows up to 32 characters but no more This field is required.
A height field is a floating-point number that is required.
And my code was:
CREATE TABLE automatic (
id SERIAL PRIMARY KEY NOT NULL,
name CHAR (32),
height numeric);
However, the self-rater answered this Expecting an INSERT without a height to fail, it did not fail.
After that, I tried this
CREATE TABLE automatic (
id int not null auto_increment primary key,
name varchar(32) not null,
height float not null);
And got
ERROR: syntax error at or near "auto_increment"
LINE 1: CREATE TABLE automagic (id int not null auto_increment prima...\
SQL state: 42601
Character: 41
You can try something like this:
CREATE TABLE automagic (
id int NOT NULL,
name varchar(32) NOT NULL,
height float NOT NULL
);
CREATE SEQUENCE automagic_id_seq
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1;
ALTER SEQUENCE automagic_id_seq OWNED BY automagic.id;
ALTER TABLE ONLY automagic ALTER COLUMN id SET DEFAULT nextval('automagic_id_seq'::regclass);
EDIT:
As pointed out by #a_horse_with_no_name, this is better:
CREATE TABLE automagic (
id int GENERATED ALWAYS AS IDENTITY,
name varchar(32) NOT NULL,
height float NOT NULL
);
maybe try this:
CREATE TABLE automagic (
id SERIAL,
name VARCHAR(32) NOT NULL,
height FLOAT NOT NULL)
Use primary key.
CREATE TABLE automagic (
id SERIAL primary key,
name VARCHAR(32) NOT NULL,
height FLOAT NOT NULL)
Related
CREATE TABLE identity (
empid VARCHAR(255) PRIMARY KEY,
entry VARCHAR(255)
);
-- Table: vectors
CREATE TABLE vectors (
f_id INTEGER PRIMARY KEY IDENTITY(1,1),
label STRING NOT NULL,
empid STRING REFERENCES identity (empid)
NOT NULL,
vector BLOB NOT NULL
);
I tried to run the above query but it gives me error
Incorrect syntax near expected '.', ID or QUOTED_ID.
I don't understand why it is giving me this error, is it because IDENTITY is a keyword in SQL Server. Kindly help!
Try this:
CREATE TABLE [identity] (
empid VARCHAR(255) PRIMARY KEY,
entry VARCHAR(255)
);
-- Table: vectors
CREATE TABLE vectors (
f_id INTEGER PRIMARY KEY IDENTITY(1,1),
label VARCHAR(255) NOT NULL,
empid VARCHAR(255) REFERENCES [identity] (empid)
NOT NULL,
vector VARCHAR(255) NOT NULL
);
Also, if you are working with SQL Server Management Studio, you can see that some words are colored in blue. It will be better to avoid them using in your code as names of tables, variables and other objects. For example, identity is such word.
Table example :
Table T1(
ID int primary key,
n1 int
)
How can I add a trigger to check if n1 is between 0 and 10 before inserting?
Answer by #500-InternalServerError (will delete if they post):
There is no need for a trigger. Use a CHECK constraint instead.
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int CHECK (Age>=18)
);
db<>fiddle
hi please how do i give sql column maximum input example if i want max_num column to take only three(3) result sets or inputs
It's mostly the same in other rdbms. You need to specify right after the column type
MYSQL
CREATE TABLE TestTable(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
three_char_demo VARCHAR(3) NOT NULL,
)
PostgreSQL
CREATE TABLE TestTable(
ID INT PRIMARY KEY NOT NULL,
three_char_demo CHAR(3) NOT NULL,
);
I am trying to make a simple database with an number generator but why do I get the error below?
ERROR: syntax error at or near "AUTO_INCREMENT"
LINE 2: IDNumber int NOT NULL AUTO_INCREMENT,
Code:
CREATE TABLE Finance
(
IDNumber int NOT NULL AUTO_INCREMENT,
FinName varchar(50) NOT NULL,
PRIMARY KEY(IDNumber)
);
The subject of the question mentions pgAdmin 4, so here's how to do it there.
First, add a column to your table, then click the little edit icon:
Then go to Constraints and select the Identity type:
This generates SQL similar to this:
CREATE TABLE public.my_table_name
(
id integer NOT NULL GENERATED ALWAYS AS IDENTITY,
PRIMARY KEY (id)
);
For Postgres you have to use SERIAL
CREATE TABLE Finance
(
IDNumber SERIAL PRIMARY KEY,
FinName varchar(50) NOT NULL
);
IN pgadmin-2.
step 01:
create seq:
and set info:
step 02: go to ID in table and set constraints
if it is sql the syntax is the following
CREATE TABLE Persons (
ID int IDENTITY(1,1) PRIMARY KEY,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int
);
You are using a MySQL syntax which won't work in SQL Server.
CREATE TABLE Finance
(
IDNumber int NOT NULL IDENTITY(1,1) PRIMARY KEY,
FinName varchar(50) NOT NULL
);
The following code should work for SQL Server.
IDENTITY(1,1) is SQL Server's way of saying "auto increment".
The starting value for IDENTITY is 1, and it will increment by 1 for each new record.
So : IDENTITY(startvalue, incrementvalue)
there are two options; one is to use the "datatype" serial or create a sequence and use this sequence as a default value for your integer as follows:
CREATE SEQUENCE your_seq;
CREATE TABLE foo(
id int default nextval('your_seq'::regclass),
other_column TEXT);
INSERT INTO foo(other_column) VALUES ('bar') RETURNING *;
It is important to note that specifying a table as follows:
CREATE TABLE tablename (
colname SERIAL);
is equivalent to:
CREATE SEQUENCE tablename_colname_seq AS integer;
CREATE TABLE tablename (
colname integer NOT NULL DEFAULT nextval('tablename_colname_seq'));
ALTER SEQUENCE tablename_colname_seq OWNED BY tablename.colname;
More information about serial can be found here.
Objective: Have postgres generate ids automatically
CREATE TABLE user_privilege (
id bigint NOT NULL,
name character varying(255) NOT NULL,
version integer
);
CREATE TABLE
INSERT INTO user_privilege (name, version) values ('XYZ', 1);
ERROR: null value in column "id" violates not-null constraint
ALTER TABLE user_privilege ALTER COLUMN id SET DEFAULT nextval('user_privilege_id_seq'::regclass);
ERROR: relation "user_privilege_id_seq" does not exist
Thanks!
EDIT:
I want to keep my id as bigint as all other tables have id as bigint.
You need to use either SERIAL or BIGSERIAL, not BIGINT.
CREATE TABLE user_privilege (
id BIGSERIAL NOT NULL,
It's not clear whether your table has a PRIMARY KEY or UNIQUE constraint. But it should.
You have to create the sequence at first:
CREATE SEQUENCE user_privilege_id_seq
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1;
and after you can use it:
ALTER TABLE ONLY user_privilege ALTER COLUMN id SET DEFAULT nextval('user_privilege_id_seq'::regclass);
Here is the create sequence documentation