PostgreSQL从空行查询打印结果

Question

我写了这个查询，但结果是空行满。如何打印没有空行的结果。我将附上结果的屏幕截图。

SELECT user_data.alternative_mail 
FROM user_data 
JOIN users_map 
ON users_map.user_id = user_data.user_id 
WHERE users_map.service_id = 1 AND 
    users_map.service_user_id = 0 AND 
    user_data.alternative_mail NOT LIKE '%@abv.bg' 

Answer 1

你可以检查电子邮件IS NOT NULL和空字符串：

SELECT user_data.alternative_mail 
FROM user_data 
JOIN users_map 
    ON users_map.user_id = user_data.user_id 
WHERE users_map.service_id = 1 
    AND users_map.service_user_id = 0 
    AND user_data.alternative_mail NOT LIKE '%@abv.bg' 
    AND user_data.alternative_mail IS NOT NULL 
    AND user_data.alternative_mail <> '';