42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
---
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title: SQL and Operator
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---
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## SQL AND operator
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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.
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We'll use the student table to present examples.
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Here's the student table without a WHERE clause:
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```sql
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select * from student;
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```
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![image-1](https://github.com/SteveChevalier/guide-images/blob/master/and_operator01.JPG?raw=true)
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Now the WHERE clause is added to display only programming students:
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```sql
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select * from student
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where programOfStudy = 'Programming';
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```
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![image-1](https://github.com/SteveChevalier/guide-images/blob/master/and_operator02.JPG?raw=true)
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Now the WHERE clause is updated with AND to show results for programming students that also have a SAT score greater than 800:
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```sql
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select * from student
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where programOfStudy = 'Programming'
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and sat_score > 800;
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```
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![image-1](https://github.com/SteveChevalier/guide-images/blob/master/and_operator03.JPG?raw=true)
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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 $18 Million in total.
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```sql
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select Candidate, Office_Sought, Election_Year, FORMAT(sum(Total_$),2) from combined_party_data
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where Office_Sought = 'PRESIDENT / VICE PRESIDENT'
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group by Candidate, Office_Sought, Election_Year
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having Election_Year = 2016 and sum(Total_$) between 3000000 and 18000000
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order by sum(Total_$) desc;
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```
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![image-1](https://github.com/SteveChevalier/guide-images/blob/master/and_operator06.JPG?raw=true)
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