SQL BETWEEN 逆序运算符条件值

SQL BETWEEN Operator conditional value in Reverse Order(SQL BETWEEN 逆序运算符条件值)

问题描述

为什么下面的 SQL 查询会显示结果?

Why the following SQL query show results?

     SELECT * FROM Products
     WHERE Price BETWEEN 10 AND 20;

但是当我们改变值的顺序时，它不会显示任何结果?

but when we change the order of value it will not show any result?

     SELECT * FROM Products
     WHERE Price BETWEEN 20 AND 10;

推荐答案

如果 test_expression 的值大于或等于 begin_expression 的值且小于或等于 end_expression 的值，则 BETWEEN 返回 TRUE.如果 test_expression 的值小于 begin_expression 的值或大于 end_expression 的值，则 NOT BETWEEN 返回 TRUE.

BETWEEN returns TRUE if the value of test_expression is greater than or equal to the value of begin_expression and less than or equal to the value of end_expression. NOT BETWEEN returns TRUE if the value of test_expression is less than the value of begin_expression or greater than the value of end_expression.

在您的情况下，您的语句评估为大于等于20且小于等于10

In your case, your statement evaluates to greater than or equal to 20 AND less than or equal to 10

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