...FROM table; Here， we must enclose textual data inside either single or double quotations like 'USA'. SQL Operators The WHERE clause uses operators to construct conditions. Some of the commonly used operators are: 1. Equal to Operator (=) -- select all columns from Customers table with first name 'John'SELECT *FROM CustomersWHERE first_name = 'John'; The above SQL command selects all the customers from the Customers table having first_name John . 2. Greater than () -- select all columns from Customers table with age greater than 25SELECT *FROM CustomersWHERE age 25; The above SQL command selects all the customers from the Customers table whose age is greater than 25 . 3. AND Operator (AND) -- select all columns from Customers table with last_name 'Doe' and country 'USA'SELECT *FROM CustomersWHERE last_name = 'Doe' AND country = 'USA'; The above SQL command selects all the customers from the Customers table having last_name Doe and country USA . Note: If none of the rows meet the WHERE clause condition， the SQL command selects all columns of the Customers table. Example: SQL SELECT AllSQL SELECT WHERE Clause A SELECT statement can have an optional WHERE clause. The WHERE clause allows us to fetch records from a database table that matches specified condition(s). For example， -- select all columns from Customers table SELECT *FROM Customers; Here。

-- select all columns from the customers table with last_name 'Doe' SELECT *FROM CustomersWHERE last_name = 'Doe'; Here。

visit SQL Operators. ， last_nameFROM Customers; Here， countryFROM CustomersWHERE country = 'USA'; Here， the SQL command selects all customers from the Customers table with the last_name Doe . Example: SQL SELECT with WHERE Let's look at another example. -- select age and country columns from customers table where the country is 'USA' SELECT age， an empty result set is returned. To learn more about all the SQL operators in detail， column2， the SQL command selects the age and country columns of all the customers whose country is USA . Example: SQL SELECT with WHERE We can also use the WHERE clause with the UPDATE statement to edit existing rows in a database table. Note: In SQL， ... are the table columns table is the table name from where we select the data For example， The SQL SELECT statement is used to select (retrieve) data from a database table. Example-- select first_name from Customers table SELECT first_nameFROM Customers; The above SQL query selects the first_name of all the customers from the Customers table. SQL SELECT Syntax The syntax of the SQL SELECT statement is: SELECT column1， -- select first_name and last_name columns from Customers table SELECT first_name，。

column1， the SQL command selects the first_name and last_name of all customers in the Customers table. Example: SQL SELECTSQL SELECT ALL To select all columns from a database table， column2， we use the * character. For example。