Creating MySQL Table

MySQLi — Create Table

Now, we will create the following table in the TUTORIALS database.

create table tutorials_tbl( tutorial_id INT NOT NULL AUTO_INCREMENT, tutorial_title VARCHAR(100) NOT NULL, tutorial_author VARCHAR(40) NOT NULL, submission_date DATE, PRIMARY KEY ( tutorial_id ) );

Here, a few items need explanation −

• Field Attribute NOT NULL is being used because we do not want this field to be NULL. So, if a user will try to create a record with a NULL value, then MySQL will raise an error.
• Field Attribute AUTO_INCREMENT tells MySQL to go ahead and add the next available number to the id field.
• Keyword PRIMARY KEY is used to define a column as a primary key. You can use multiple columns separated by a comma to define a primary key.

Creating Tables from Command Prompt

It is easy to create a MySQL table from the mysql> prompt. You will use the SQL command CREATE TABLE to create a table.

Example

Here is an example, which will create tutorials_tbl −

root@host# mysql -u root -p Enter password:******* mysql> use TUTORIALS; Database changed mysql> CREATE TABLE tutorials_tbl( → tutorial_id INT NOT NULL AUTO_INCREMENT, → tutorial_title VARCHAR(100) NOT NULL, → tutorial_author VARCHAR(40) NOT NULL, → submission_date DATE, → PRIMARY KEY ( tutorial_id ) → ); Query OK, 0 rows affected (0.16 sec) mysql>

NOTE − MySQL does not terminate a command until you give a semicolon (;) at the end of SQL command.

Creating Tables Using PHP Script

PHP uses mysqli query() or mysql_query() function to create a MySQL table. This function takes two parameters and returns TRUE on success or FALSE on failure.

Syntax

Required — SQL query to create a MySQL table.

Optional — Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.

Example

Try the following example to create a table −

Copy and paste the following example as mysql_example.php −

    ", $mysqli→connect_error); exit(); > printf('Connected successfully.
'); $sql = "CREATE TABLE tutorials_tbl( ". "tutorial_id INT NOT NULL AUTO_INCREMENT, ". "tutorial_title VARCHAR(100) NOT NULL, ". "tutorial_author VARCHAR(40) NOT NULL, ". "submission_date DATE, ". "PRIMARY KEY ( tutorial_id )); "; if ($mysqli→query($sql)) < printf("Table tutorials_tbl created successfully.
"); > if ($mysqli→errno) < printf("Could not create table: %s
", $mysqli→error); > $mysqli→close(); ?>  

Output

Access the mysql_example.php deployed on apache web server and verify the output.

Connected successfully. Table tutorials_tbl created successfully.

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Php how to add column in sql table

After the data type, you can specify other optional attributes for each column: NOT NULL — Each row must contain a value for that column, null values are not allowed DEFAULT value — Set a default value that is added when no other value is passed UNSIGNED — Used for number types, limits the stored data to positive numbers and zero AUTO INCREMENT — MySQL automatically increases the value of the field by 1 each time a new record is added PRIMARY KEY — Used to uniquely identify the rows in a table. We will create a table named «MyGuests», with five columns: «id», «firstname», «lastname», «email» and «reg_date»: CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50), reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP

How to add new column to MYSQL table?

ALTER TABLE yourtable ADD q6 VARCHAR( 255 ) after q5 

 $table = 'your table name'; $column = 'q6' $add = mysql_query("ALTER TABLE $table ADD $column VARCHAR( 255 ) NOT NULL"); 

you can change VARCHAR( 255 ) NOT NULL into what ever datatype you want.

• You can add a new column at the end of your table ALTER TABLE assessment ADD q6 VARCHAR( 255 )
• Add column to the begining of table ALTER TABLE assessment ADD q6 VARCHAR( 255 ) FIRST
• Add column next to a specified column ALTER TABLE assessment ADD q6 VARCHAR( 255 ) after q5

SQL INSERT INTO SELECT Statement, WHERE condition;. Copy only some columns from one table into another table: INSERT INTO table2 (column1, column2,

PHP Tutorial for Beginners — Adding and removing columns

In this video we will review how to add and remove columns from your table.SQL code:ALTER Duration: 2:59

Adding a column to a database table in phpMyAdmin

5 Migrations -Part 3 How to add new columns to existing tables

Adding new columns to a table using php/sql

I think your mistake is that your select tag doesn’t have a name attribute. Remember that a form when is submitted, it takes the value of elements with the name attribute.

So, if you put in your HTML code , you will be able to catch its value in your sql.php query with $_POST[«category»] ; maybe the $_POST[«category»] is arriving empty, and therefore you cannot execute the $query1 sentence.

PHP Tutorial for Beginners — Adding and removing columns, In this video we will review how to add and remove columns from your table.SQL code:ALTER Duration: 2:59

PHP MySQL Create Table

A database table has its own unique name and consists of columns and rows.

Create a MySQL Table Using MySQLi and PDO

The CREATE TABLE statement is used to create a table in MySQL.

We will create a table named «MyGuests», with five columns: «id», «firstname», «lastname», «email» and «reg_date»:

CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)

Notes on the table above:

The data type specifies what type of data the column can hold. For a complete reference of all the available data types, go to our Data Types reference.

After the data type, you can specify other optional attributes for each column:

• NOT NULL — Each row must contain a value for that column, null values are not allowed
• DEFAULT value — Set a default value that is added when no other value is passed
• UNSIGNED — Used for number types, limits the stored data to positive numbers and zero
• AUTO INCREMENT — MySQL automatically increases the value of the field by 1 each time a new record is added
• PRIMARY KEY — Used to uniquely identify the rows in a table. The column with PRIMARY KEY setting is often an ID number, and is often used with AUTO_INCREMENT

Each table should have a primary key column (in this case: the «id» column). Its value must be unique for each record in the table.

The following examples shows how to create the table in PHP:

Example (MySQLi Object-oriented)

$servername = «localhost»;
$username = «username»;
$password = «password»;
$dbname = «myDB»;

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) <
die(«Connection failed: » . $conn->connect_error);
>

// sql to create table
$sql = «CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)»;

if ($conn->query($sql) === TRUE) <
echo «Table MyGuests created successfully»;
> else <
echo «Error creating table: » . $conn->error;
>

Example (MySQLi Procedural)

$servername = «localhost»;
$username = «username»;
$password = «password»;
$dbname = «myDB»;

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) <
die(«Connection failed: » . mysqli_connect_error());
>

// sql to create table
$sql = «CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)»;

if (mysqli_query($conn, $sql)) <
echo «Table MyGuests created successfully»;
> else <
echo «Error creating table: » . mysqli_error($conn);
>

Example (PDO)

$servername = «localhost»;
$username = «username»;
$password = «password»;
$dbname = «myDBPDO»;

try <
$conn = new PDO(«mysql:host=$servername;dbname=$dbname», $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// sql to create table
$sql = «CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)»;

// use exec() because no results are returned
$conn->exec($sql);
echo «Table MyGuests created successfully»;
> catch(PDOException $e) <
echo $sql . «
» . $e->getMessage();
>

Mysql — mysqli and php adding columns in, mysqli and php adding columns in I want to add a column to a table inside MySQL. I am using MySQLi and in the code below, I wrote a code I saw

(php)import .sql and add columns if table exists or create new table

you get that message because column id already exist and has KEY, if its PRIMARY KEY and AUTOINCREMENTED then it can not be duplicated, try this:

ALTER TABLE Table1 ADD COLUMN Gender varchar(10) NOT NULL DEFAULT 'none'; ALTER TABLE Table2 ADD COLUMN coloum1 varchar(100) NOT NULL DEFAULT 'none'; ALTER TABLE Table2 ADD COLUMN coloum2 varchar(255) NOT NULL DEFAULT 'none'; 

or just import the new columns

Add new column to wordpress database, $sql = «CREATE TABLE ( say_id int(11) not null AUTO_INCREMENT, customer_mail text not null, customer_name text not null,

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How to Add a Column to a MySQL Table Using PHP

In this article, we show how to add a new column to a MySQL table using PHP.

We add a new column to a MySQL table using PHP to write the MySQL query to add the column the table.

So the above is the PHP code to add a column to a MySQL table at the end of table, meaning it will be the last column.

So a column named email is added to the last column of the table. So if the table had 2 columns named first name and last name. It will now contain first name, last name, and email, in that order.

We’ll now show how to tie this in completely with the full PHP code to add a column to a MySQL table.

So, first, we must connect to the database.

After we do this, we create a variable named $add. This $add variable is set equal to a mysql_query() function that has the parameter «ALTER TABLE customers ADD email VARCHAR(50) NOT NULL». This adds the column, email, to the customers table. PHP.

The email column is of type VARCHAR(50) NOT NULL. This makes it a variable string up to 50 characters in length.

How to Add a Column After a Specified Column

So the code above shows how to add a column to the end of a table. The column you add will be the last column of the table.

However, you may not want to add the column to the end of a table. You may want to add it after a specific column.

The MySQL query below is the general format to add a column after a specified column.

So the code above adds a column named email of type VARCHAR(50) after the column firstname to the table customers.

We’ll now show how to tie this in completely with the full PHP code to add a column to a MySQL table after a specified column.

So the code above adds a column named email of type VARCHAR(50) after the column named firstname.

So the MySQL keyword AFTER can enable us to add columns after a specified column in a table.

How to Add a Column to the Beginning of a Table

Now we show how to add a column to the beginning of a MySQL table.

The MySQL query below is the general format to add a column to the beginning of a table is shown below.

So the code above adds a column named email of type VARCHAR(50) after the column firstname to the table customers.

We’ll now show how to tie this in completely with the full PHP code to add a column to a MySQL table after a specified column.

So this code shows how to add a column to the beginning of a MySQL table using PHP.

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