SQL Query将字放在字段而不是0？

Question

当我运行 sql query 时，如;

Select 
    F1 as name, 
    F2 as phone 
from Table where condition = true

如果F2 = 0 我需要将该字段设为No Phone Number而不是null或0

Answer 1

您可以使用CASE语句执行此操作：

SELECT
CASE WHEN F2 = '0' THEN '(No Phone Number)' ELSE F2 END AS Phone
...

Answer 2

SELECT
CASE WHEN F2 = '0' OR F2 IS NULL THEN '(No Phone Number)' ELSE F2 END AS Phone 

Answer 3

您需要使用CASE作为;

SELECT 
    F1 As name, 
    CASE WHEN F2 IS NULL OR F2 = '0' THEN 'No Phone Number' ELSE F2 END As phone
FROM Table
WHERE condition = 'true'