SQL > SQL Commands > And Or

In the previous section, we have seen that the WHERE keyword can be used to conditionally select data from a table. This condition can be a simple condition (like the one presented in the previous section), or it can be a compound condition. Compound conditions are made up of multiple simple conditions connected by AND or OR. There is no limit to the number of simple conditions that can be present in a single SQL statement.

The syntax for a compound condition is as follows:

SELECT "column_name"
FROM "table_name"
WHERE "simple condition"
{ [AND|OR] "simple condition"}+;

The { }+ means that the expression inside the bracket will occur one or more times. [AND|OR] means that either AND or OR can be used. In addition, we may use the parenthesis sign ( ) to indicate the order of the condition.

For example, we may wish to select all stores with sales greater than $1,000 or all stores with sales less than $500 but greater than $275 in Table Store_Information,

Table Store_Information

Los Angeles1500Jan-05-1999
San Diego250Jan-07-1999
San Francisco300Jan-08-1999

we key in,

SELECT Store_Name
FROM Store_Information
WHERE Sales > 1000
OR (Sales < 500 AND Sales > 275);


Los Angeles
San Francisco


For these exercises, assume we have a table called Users with the following data:

Table Users


1. Which of the following SQL statement is valid? (There can be more than one answer)
a) SELECT First_Name AND Last_Name FROM Users;
b) SELECT First_Name, Last_Name FROM Users WHERE Join_Date > 'Apr-01-2015' AND Birth_Date < 'Jan-01-1980';
c) SELECT First_Name OR User_Name FROM Users;
d) SELECT * FROM Users WHERE Last_Name = 'Brown' AND Gender = 'F';

2. How many records will be returned by the following query?
SELECT * FROM Users WHERE Gender = 'M' AND Join_Date = 'Apr-09-2015';

3. How many records will be returned by the following query?
SELECT * FROM Users WHERE Gender = 'M' OR Join_Date = 'Apr-05-2015';

Next: SQL IN

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