How to use the WHERE AND keyword in SQL

Overview

We use the AND keyword with WHERE in SQL when we want to filter based on many conditions.

The WHERE AND keyword selects data from the table based on multiple conditions.

Note: We can have any number of AND conditions, but we must specify the column name separately for every AND condition.

Syntax

SELECT column_name
FROM table_name
WHERE condition
AND condition;

Code

Let’s assume we have a table called Person with the columns ID, name, age, state, and gender.

Now, we want to get the name and ages of all female persons in the state of Lagos.

How do we get this information from our table?

The following code shows how to do this using the WHERE AND keyword in SQL.

CREATE TABLE Person (
    ID int,
    name varchar(100),
    age int,
    gender varchar(10),
    state varchar(15)
);
-- Insert data
INSERT INTO Person
VALUES (1,'Sharon Peller','16','Female','Kogi');
INSERT INTO Person
VALUES (2,'Paul Dons','20','Male','Lagos');
INSERT INTO Person
VALUES (3,'Ameera Abedayo','28','Female','Ibadan');
INSERT INTO Person
VALUES (4,'Maria Elijah','25','Female','Lagos');
INSERT INTO Person
VALUES (5,'David Hassan','30','Male','Abuja');
INSERT INTO Person
VALUES (6,'Niniola Disu','28','Female','Lagos');
INSERT INTO Person
VALUES (7,'Praise Dominion','16','Female','Ibadan');
INSERT INTO Person
VALUES (8,'Joe Smith','16','Male','Lagos');
-- Query 
SELECT name, age
FROM Person
WHERE gender = 'Female'
AND state = 'Lagos';

Explanation

  • Lines 1–7: We create a table called Person with the columns ID, name, age, gender, and state.
  • Lines 10–25: We insert data into the Person table.
  • Lines 28–31: We filter the data based on some conditions using the WHERE AND keyword.

Note: For every AND condition, we must specify the column name.

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