HAVING AND
时间: 2024-02-10 17:40:09 浏览: 15
HAVING and AND are two different operators in SQL.
HAVING is used in conjunction with GROUP BY to filter the results of an aggregate function. It allows you to specify a condition that must be met by a group of rows, rather than individual rows. For example, you might use HAVING to find all groups with a count greater than a certain value:
```
SELECT category, COUNT(*) as num_products
FROM products
GROUP BY category
HAVING num_products > 5;
```
This would return all categories with more than 5 products.
AND, on the other hand, is a logical operator used to combine two or more conditions in a WHERE clause. It specifies that all conditions must be true for a row to be included in the result set. For example:
```
SELECT *
FROM customers
WHERE age > 18 AND city = 'New York';
```
This would return all customers who are over 18 years old and live in New York.
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