Question

任何人都可以帮助我理解使用AND的语法4次。

我有这段代码

WHERE (ListPrice >= 400) and (ListPrice <= 800) AND (Color = 'Red') OR (Color = 'Black')

一旦评估，它会提供许多其他没有红色或黑色的列。请帮忙

Answer 1

WHERE (ListPrice BETWEEN 400 and 800) AND (Color in ('Red','Black'))

Answer 2

您需要单独评估OR，然后AND评估其他条件。见这个

WHERE (ListPrice >= 400) and (ListPrice <= 800) AND (Color = 'Red' OR Color = 'Black')

Answer 3

您可以尝试以下

select * from t1 where pr >=400 and pr<=800 and (co='Red' or co='Black' );

以下是测试 -

create table t1 (pr number(10),co varchar2(10));

insert  into t1 values (700,'Red');
insert  into t1 values (500,'Black');
insert  into t1 values (200,'Black');
insert  into t1 values (900,'Red');
commit;

select * from t1 where pr >=400 and pr<=800 and (co='Red' or co='Black' );

输出 -

PR  CO

700 Red

500 Black

SQL多个AND和OR

3 个答案: