T-SQL中的If-Else语句

Question

我正在尝试更改当前显示的Transact-SQL(MS SQL Server)报告的结果:

CompanyA     DVCE3
CompanyB     DVCE2
CompanyC     DVCE3
CompanyD     NULL 
CompanyE     DVCE3

而我希望它显示:

CompanyA     36
CompanyB     24
CompanyC     36
CompanyD      
CompanyE     36

我确定这个问题的答案是使用某种if/else语句或case语句,但我不确定T-SQL中的语法或它应该放在我的查询中.

我的基本查询如下所示:

SELECT
   companyName
   , term
FROM tableA a
   JOIN tableB b on a.id = b.id ...
WHERE 
   customerNumber IS NOT NULL
   AND companyName != 'TEST'... ;

谢谢你的帮助.

Answer 1

用以下内容替换"term"字段:

CASE WHEN term='DVCE3' THEN '36' WHEN term='DVCE2' THEN '24' ELSE '' END as term

为了便于阅读,我会重写它:

CASE
    WHEN term='DVCE3' THEN '36'
    WHEN term='DVCE2' THEN '24'
    ELSE ''
END as term