NOT HAVING
子句是 SQL 中用于过滤分组后的结果集的一种方式。与 HAVING
子句相反,NOT HAVING
用于排除满足特定条件的分组。HAVING
子句通常与 GROUP BY
子句一起使用,用于对分组后的数据进行条件过滤。
NOT HAVING
提供了在分组后对数据进行更精细的过滤能力。NOT HAVING
,可以排除那些虽然满足某些聚合条件但不符合特定业务逻辑的分组。NOT HAVING
子句本身没有多种类型,它只是一个逻辑操作符,用于否定 HAVING
子句的条件。
假设你有一个销售数据表,你想找出那些总销售额低于某个阈值的分组(例如,低于 1000 的销售员):
SELECT salesperson_id, SUM(sales_amount) AS total_sales
FROM sales
GROUP BY salesperson_id
HAVING total_sales < 1000;
如果你想找出那些总销售额不低于 1000 的销售员,可以使用 NOT HAVING
:
SELECT salesperson_id, SUM(sales_amount) AS total_sales
FROM sales
GROUP BY salesperson_id
NOT HAVING total_sales < 1000;
NOT HAVING
子句没有生效?原因:
NOT HAVING
子句的语法不正确。NOT HAVING
子句的条件逻辑不正确。NOT HAVING
子句的条件。解决方法:
NOT HAVING
子句的语法正确。NOT HAVING
子句的语法正确。NOT HAVING
子句的条件逻辑正确。NOT HAVING
子句的条件逻辑正确。假设你有一个销售数据表 sales
,结构如下:
CREATE TABLE sales (
salesperson_id INT,
sales_amount NUMBER
);
插入一些示例数据:
INSERT INTO sales (salesperson_id, sales_amount) VALUES (1, 500);
INSERT INTO sales (salesperson_id, sales_amount) VALUES (1, 600);
INSERT INTO sales (salesperson_id, sales_amount) VALUES (2, 1500);
INSERT INTO sales (salesperson_id, sales_amount) VALUES (3, 800);
查询总销售额不低于 1000 的销售员:
SELECT salesperson_id, SUM(sales_amount) AS total_sales
FROM sales
GROUP BY salesperson_id
NOT HAVING total_sales < 1000;
希望这些信息对你有所帮助!
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