Updating rows in a SQL database is a crucial task that allows you to modify existing data in a table. SQL provides a straightforward way to update rows using the UPDATE statement, which allows you to change the values of one or more columns in a table.
#UPDATE syntax
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE key = value
To update a row in a SQL table, you need to use the UPDATE statement, followed by the name of the table you want to update. You then need to specify the new values for the columns you want to update using the SET keyword.
#Example UPDATE Syntax
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;
UPDATE customers SET last_name = "Heart" WHERE first_name = "John";
SELECT * FROM customers;
Updating rows in a SQL table is a critical part of working with databases and allows you to modify existing data to reflect changes in your application. By using the UPDATE statement and specifying the columns and values you want to change, you can update rows efficiently and with ease.
Updating 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", "Doe", 23), ("Eric", "Smith", 26);
SELECT * FROM customers;
UPDATE customers SET age = 27 WHERE first_name = "Eric";
SELECT * FROM customers;
In summary, updating rows in a SQL table is an essential task that allows you to modify existing data in a database. Using the UPDATE statement and the SET keyword, you can update one or more columns in a table with ease. By updating rows in a SQL table, you can keep your database up-to-date and ensure that your application is working with the latest information.
