如何将表达式转换为sql查询

Question

我有任何表达式现在我需要在我的sql数据库记录上运行请帮我用sql这里是代码

if (( (gpa == edu.gpa || gpa <= 0) && (edu.gpa.Equals(gpa) || string.IsNullOrEmpty(gpa))

我尝试过类似的转换为SQL查询，如

SELECT *
FROM education
WHERE (gpa >= somevalue OR gpa =0 )
AND (degree = 'somevalue' OR degree is NULL)

如果用户在过滤器中输入空值，则此查询不会返回正确的结果。

Answer 1

试试这个：

SELECT *
FROM education
WHERE (gpa IS NULL OR gpa >= somevalue OR gpa =0 )
AND (degree is NULL OR degree = 'somevalue' OR TRIM(degree) = '')

试试this SQL Fiddle并告诉我们。

Answer 2

试试这个

 SELECT *
 FROM education
 WHERE (degree = 'somevalue' OR degree is NULL)
 HAVING gpa >= somevalue OR gpa =0