INSERT Statement in SQL

SQL (Structured Query Language) is a programming language used for managing relational databases. The INSERT statement is one of the most important statements in SQL, as it allows you to add data to a database. The INSERT statement is used to insert new records into a table in a database. In this blog post, we will discuss everything you need to know about the INSERT statement in SQL.

The INSERT query in SQL is used to insert new records into a database table.

The syntax for the INSERT query is:

INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);

The table_name specifies the name of the table where the new records will be inserted. The column1, column2, … list specifies the names of the columns to be inserted, and the value1, value2, … list specifies the values to be inserted into each corresponding column.

It’s important to ensure that the number of columns specified in the column1, column2, … list matches the number of values specified in the value1, value2, … list, and that the data type of each value matches the data type of its corresponding column.

The INSERT query is a fundamental operation in SQL and is used to populate a database with initial data, insert new records as they are generated, and add additional records to existing tables.

What is INSERT Query in SQL?

The INSERT query in SQL is a command used to insert new records into a database table. The INSERT query specifies the name of the table and the values to be inserted into each corresponding column of the table.

The basic syntax for an INSERT query is:

INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);

Where table_name is the name of the table, column1, column2, … is a list of the column names for the new record, and value1, value2, … is a list of the corresponding values for each column.

The INSERT query is an essential operation in SQL and is used to add new data to a database table. The query can be used to insert a single record or multiple records at once, and the values can be specified explicitly or derived from other database tables or subqueries.

Here’s an example in MySQL of using the INSERT query to insert a new record into a table:

CREATE TABLE employees (
  id INT PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(50),
  age INT,
  salary FLOAT
);
INSERT INTO employees (name, age, salary)
VALUES ('John Doe', 35, 50000);
SELECT * FROM employees;
Result:
id  name           age  salary
1   John Doe       35   500

In this example, a new table named employees is created with four columns: id, name, age, and salary. A new record is then inserted into the employee’s table using the INSERT query.

The name, age, and salary columns are specified, and the values for each column are set to ‘John Doe’, 35, and 50000 respectively. Finally, a SELECT query is used to retrieve all records from the employee’s table and display the result, which shows the newly inserted record.

Using SELECT Query in INSERT INTO 

The SELECT query is used along with the INSERT INTO statement to select the data from another table. The following are the various ways to use the SELECT statement with the INSERT query in SQL:

You can use a SELECT query within an INSERT INTO statement to insert data from one or more tables into another table.

The basic syntax for this is:

INSERT INTO table1 (column1, column2, ...)
SELECT column1, column2, ...
FROM table2
WHERE conditions;

Where table1 is the name of the table that you want to insert data into, column1, column2, … is a list of the column names that you want to insert data into, and table2 is the name of the table that you want to select data from. The WHERE clause is used to specify conditions to filter the data that you want to insert into Table 1.

Here’s an example in MySQL:

CREATE TABLE employees (
  id INT PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(50),
  age INT,
  salary FLOAT
);
CREATE TABLE new_employees (
  name VARCHAR(50),
  age INT,
  salary FLOAT
);
INSERT INTO new_employees (name, age, salary)
SELECT name, age, salary
FROM employees
WHERE age >= 35;
SELECT * FROM new_employees;
Result:
name           age  salary
John Doe       35   50

In this example, two tables named employees and new_employees are created. The employee’s table contains one record with the values ‘John Doe’, 35, and 50000 for the name, age, and salary columns respectively.

The INSERT INTO statement is then used to insert data from the employee’s table into the new_employees table. The SELECT query within the INSERT INTO statement specifies selecting only the records from the employee’s table where the age column is greater than or equal to 35.

Finally, a SELECT query is used to retrieve all records from the new_employees table and display the result, which shows the newly inserted record.

With this, we come to the end of this article. I hope you understood how to use Insert Query in SQL.

The INSERT statement in SQL is used to add new records to a table. It has the following syntax:

INSERT INTO table_name (column1, column2, column3, ...)
VALUES (value1, value2, value3, ...);

Here, table_name is the name of the table you want to insert the record into. column1, column2, column3, etc. are the names of the columns in the table in that you want to insert data. value1, value2, value3, etc. are the values you want to insert into the corresponding columns.

You can also use the INSERT INTO statement to insert data from another table. The syntax for this is as follows:

INSERT INTO table_name (column1, column2, column3, ...)
SELECT column1, column2, column3, ...
FROM another_table_name;

Here, table_name is the name of the table you want to insert the data into, and another_table_name is the name of the table you want to select the data from.

Conclusion:

In conclusion, the INSERT statement in SQL is a powerful tool that allows you to add data to a database. Whether you are adding new records to a table or inserting data from another table, the INSERT statement can help you accomplish your goals. By following the syntax and examples provided in this blog post, you should be able to use the INSERT statement effectively in your own SQL queries.

FAQ’s

Q1 What is an INSERT query in SQL?

An INSERT query is used to add new records to a table in a SQL database.

Q2 How do I write an INSERT query?

Syntax: INSERT INTO table_name (column1, column2, column3, …) VALUES (value1, value2, value3, …);

Q3 Can I insert multiple rows at once?

Yes, you can insert multiple rows using a single INSERT query by using the syntax: INSERT INTO table_name (column1, column2, …) VALUES (value1, value2, …), (value1, value2, …), …;