Inserting Rows (learnsqlonline.org)

Inserting rows is a critical part of working with databases, and SQL provides a straightforward way to insert data into a table. To insert data into a table in SQL, you need to use the INSERT INTO statement, followed by the name of the table and a set of values enclosed in parentheses.

#Insert Row Example
INSERT INTO table_name (column1, column2)
VALUES (value11, value12), (value21, value22), (value31, value32);

INSERT INTO table_name VALUES (value1, value2, value3, value4...);

#Incorrect INSERT method
INSERT INTO table_name VALUES (value1, value2, value3, value4...);

#Insert Query
CREATE TABLE customers (first_name NOT NULL, last_name NOT NULL, age);
INSERT INTO customers (first_name, last_name, age) VALUES ("John", "Doe", 23);
SELECT * FROM customers;

Each value corresponds to a column in the table, and the values should be in the same order as the columns in the table.

#Columb Omition
CREATE TABLE customers (first_name NOT NULL, last_name NOT NULL, age);
INSERT INTO customers VALUES ("John", "Doe", 23);
SELECT * FROM customers;

#Age not specified, will fail
CREATE TABLE customers (first_name NOT NULL, last_name NOT NULL, age);
INSERT INTO customers VALUES ("John", "Doe");
SELECT * FROM customers;

Once you have inserted rows into a table, you can use various SQL statements and operations to retrieve and manipulate the data. These operations are essential for working with databases and allow you to store and manipulate data in a structured and organized way.

#Adding More users
CREATE TABLE customers (first_name NOT NULL, last_name NOT NULL, age);

INSERT INTO customers (first_name, last_name, age)
VALUES ("John", "Doe", 23), ("Eric", "Smith", 26);

SELECT * FROM customers;

You can also insert multiple rows at once by separating the sets of values with commas.

Inserting Rows Exercise Solution

#Code Completed
CREATE TABLE customers (first_name NOT NULL, last_name NOT NULL, age);

INSERT INTO customers (first_name, last_name, age)
VALUES ("John", "Snow", 33);

SELECT * FROM customers;

In summary, inserting rows is a critical aspect of working with databases, and SQL provides a powerful and flexible way to insert data into tables. By inserting rows into tables and using SQL to manipulate the data, you can build robust and scalable applications that store and retrieve data in a structured and organized way.