Combining different conditions in the WHERE clause of SQL is really important. It helps you get specific data from a database.

You can use the words AND and OR to connect these conditions.

• AND means that all the conditions must be true for a record to appear in your results.
• OR means that if any of the conditions are true, the record will show up.

Example:

Let’s say you want to find students who are majoring in Computer Science and have a GPA greater than 3.0. Your query would look like this:

SELECT * 
FROM Students 
WHERE Major = 'Computer Science' AND GPA > 3.0;

Now, if you want to find students who are either in Computer Science or have a GPA above 3.5, you would write:

SELECT * 
FROM Students 
WHERE Major = 'Computer Science' OR GPA > 3.5;

You can also use parentheses to group conditions and decide the order in which they are checked. For example:

SELECT * 
FROM Students 
WHERE (Major = 'Computer Science' OR Major = 'Mathematics') AND GPA > 3.0;

In this case, this query will return students who are either studying Computer Science or Mathematics, as long as their GPA is greater than 3.0.

Things to Remember:

• Always make sure your conditions are clear. This will help avoid getting unexpected results.
• Use parentheses wisely. They help keep your query easy to read and show which conditions to check first.