apache derby create table

To create a table in Apache Derby, you can use the CREATE TABLE statement. Here is the basic syntax:

CREATE TABLE table_name (
   column1 datatype [constraint],
   column2 datatype [constraint],
   ...
);

Here is an example of creating a simple table in Apache Derby:

CREATE TABLE students (
   id INT NOT NULL PRIMARY KEY,
   name VARCHAR(50) NOT NULL,
   age INT,
   email VARCHAR(100) UNIQUE
);

In this example, we are creating a table called students with four columns: id, name, age, and email. The id column is defined as an integer data type with a NOT NULL constraint and a PRIMARY KEY constraint, which ensures that each row in the table has a unique value for the id column. The name column is defined as a variable-length character data type (VARCHAR) with a maximum length of 50 characters and a NOT NULL constraint, which ensures that each row has a value for the name column. The age column is defined as an integer data type with no constraints, which means that it can have null values. The email column is defined as a variable-length character data type (VARCHAR) with a maximum length of 100 characters and a UNIQUE constraint, which ensures that each value in the email column is unique across all rows in the table.

You can customize the column definitions based on your specific needs and requirements. You can also add additional constraints, such as CHECK constraints, FOREIGN KEY constraints, or DEFAULT values, to further enforce data integrity and consistency in your table.