42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
---
|
|
title: SQL and Operator
|
|
---
|
|
## SQL AND operator
|
|
|
|
AND is used in a WHERE clause or a GROUP BY HAVING clause to limit the rows returned from the executed statement. Use AND when it's required to have more than one condition met.
|
|
|
|
We'll use the student table to present examples.
|
|
|
|
Here's the student table without a WHERE clause:
|
|
```sql
|
|
select * from student;
|
|
```
|
|
|
|
|
|
Now the WHERE clause is added to display only programming students:
|
|
```sql
|
|
select * from student
|
|
where programOfStudy = 'Programming';
|
|
```
|
|
|
|
|
|
Now the WHERE clause is updated with AND to show results for programming students that also have a SAT score greater than 800:
|
|
```sql
|
|
select * from student
|
|
where programOfStudy = 'Programming'
|
|
and sat_score > 800;
|
|
```
|
|
|
|
|
|
|
|
This is a more complex example from the campaign contributions table. This example has a GROUP BY clause with HAVING clause using an AND to restrict the returned records to candidates from 2016 with contributions between $3 Million and $18 Million in total.
|
|
```sql
|
|
select Candidate, Office_Sought, Election_Year, FORMAT(sum(Total_$),2) from combined_party_data
|
|
where Office_Sought = 'PRESIDENT / VICE PRESIDENT'
|
|
group by Candidate, Office_Sought, Election_Year
|
|
having Election_Year = 2016 and sum(Total_$) between 3000000 and 18000000
|
|
order by sum(Total_$) desc;
|
|
```
|
|
|
|
|