SQL INSERT INTO – Add New Records to Tables

Introduction – Why Use INSERT INTO?

The INSERT INTO statement in SQL is used to add new rows of data to a table. It’s essential for populating a database with information like user registrations, product listings, orders, and any other incoming data.

Understanding how to use INSERT INTO efficiently helps maintain data integrity and supports batch data operations.

In this guide, you’ll learn how to:

• Insert a single row of data
• Insert multiple rows
• Insert with specific columns
• Use INSERT INTO SELECT to copy from other tables

1. Basic Syntax – Insert All Columns

INSERT INTO table_name
VALUES (value1, value2, ...);

All column values must match the table’s column order.

2. Specify Columns Explicitly

INSERT INTO employees (name, age, department)
VALUES ('Alice', 30, 'HR');

Always recommended to avoid column order mismatches.

3. Insert Multiple Rows

INSERT INTO employees (name, age, department)
VALUES
  ('John', 28, 'Sales'),
  ('Maria', 32, 'IT');

Efficient for bulk inserts in a single statement.

4. INSERT INTO SELECT – Copy From Another Table

INSERT INTO archive_employees (id, name, department)
SELECT id, name, department
FROM employees
WHERE status = 'resigned';

Adds selected rows from one table into another.

5. Insert NULL and Default Values

INSERT INTO employees (name, age, department)
VALUES ('Nina', NULL, DEFAULT);

Use NULL or DEFAULT based on column definitions.

Best Practices

Summary – Recap & Next Steps

INSERT INTO is a fundamental SQL statement that lets you add data into relational tables. It supports single-row, multi-row, and conditional insert operations.

Key Takeaways:

• Use INSERT INTO to populate your tables with new data
• Always match values with columns
• Use INSERT INTO SELECT for copying between tables
• Handle NULLs and defaults properly

Real-World Relevance:
Used in web apps, APIs, dashboards, form submissions, and ETL pipelines.

Next up: Learn how to modify existing data with SQL UPDATE.

FAQ – SQL INSERT INTO

Can I insert multiple rows at once?

Yes, just separate each row with commas in a single statement.

What happens if I omit a column in the INSERT?

It must have a default value or accept NULL, otherwise you’ll get an error.

How do I insert data into selected columns?

Specify the columns explicitly in the INSERT INTO clause.

Can I insert data from one table into another?

Yes, use INSERT INTO SELECT ... for this.

Can I insert data without knowing the column names?

Not recommended. It may break if table structure changes.