如何通过TSQL中的空值检查将值设置为true或false?

问题描述:

如果字段不为NULL,返回TRUE的正确语法是什么?如果TSQL中为空,则返回FALSE?

What is the right syntax to return TRUE if the field is not NULL and to return FALSE if it is NULL in TSQL?

SELECT -- here return TRUE if table.Code IS NOT NULL. And FALSE otherwise
FROM table


 select case 
           when code IS NULL then 'false'
           else 'true'
        end as result
 from the_table