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SQL is a powerful language used to manage and manipulate relational databases. To create a new relation in SQL, you use the `CREATE TABLE` command. The syntax is `CREATE TABLE (column1 datatype1, column2 datatype2, column3 datatype3, …);`. This command creates a new table with the specified columns and data types.
The `CREATE TABLE` command is used to create a new table in SQL. The table can have any number of columns and each column can have a different data type. The syntax for the `CREATE TABLE` command is as follows:
“`sql
CREATE TABLE table_name (
column1 datatype1,
column2 datatype2,
column3 datatype3,
….
);
“`
Here’s an example of how to create a new table called employees with three columns: id, name, and age:
“`sql
CREATE TABLE employees (
id INT PRIMARY KEY,
name VARCHAR(50),
age INT
);
“`
To create a relationship between two tables, you create a foreign key constraint. You have a parent table and a child table. The parent contains the primary key, and the child table contains a foreign key that references the primary key of the parent table.
Here’s an example of how to create a foreign key constraint:
“`sql
CREATE TABLE orders (
order_id INT PRIMARY KEY,
customer_id INT,
order_date DATE,
FOREIGN KEY (customer_id) REFERENCES customers(customer_id)
);
“`
This creates a new table called orders with three columns: order_id, customer_id, and order_date. The customer_id column is a foreign key that references the customer_id column in the customers table.
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