sqliteHow can I ensure my SQLite database columns do not have null values?

The best way to ensure that your SQLite database columns do not have null values is to use the NOT NULL constraint when creating the table. This will prevent any null values from being inserted into the table.

For example:

CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY,
    name TEXT NOT NULL,
    email TEXT NOT NULL
);

This code will create a table called users with three columns: id, name, and email. The name and email columns will not accept any null values.

You can also use the DEFAULT keyword to specify a default value for a column. This will ensure that the column will always have a value, even if no value is provided when inserting a new row.

For example:

CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY,
    name TEXT NOT NULL,
    email TEXT NOT NULL,
    active INTEGER DEFAULT 1
);

This code will create a table called users with four columns: id, name, email, and active. The active column will always have a value of 1 if no value is provided when inserting a new row.

Finally, you can also use the CHECK constraint when creating the table to ensure that the values inserted into a column are valid.

For example:

CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY,
    name TEXT NOT NULL,
    email TEXT NOT NULL,
    active INTEGER DEFAULT 1,
    CHECK (active IN (0, 1))
);

This code will create a table called users with four columns: id, name, email, and active. The active column will only accept values of 0 or 1.

Helpful links

• SQLite Documentation - NOT NULL Constraint
• SQLite Documentation - DEFAULT Constraint
• SQLite Documentation - CHECK Constraint

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