我用\!命令从shell中grep出NULL值:

\! mysql -e "SELECT * FROM table WHERE column = 123456\G" | grep -v NULL

使用正确的.my.cnf(其中指定了数据库/用户名/密码)效果最好。这样你只需要用\!mysql e和| grep -v NULL。

是的，在你的查询中像下面这样使用NOT NULL。

SELECT * 
FROM table
WHERE col IS NOT NULL;

你可以过滤掉特定列中包含NULL值的行:

SELECT col1, col2, ..., coln
FROM yourtable
WHERE somecolumn IS NOT NULL

如果你想过滤掉任何列中包含null的行，那么试试这个:

SELECT col1, col2, ..., coln
FROM yourtable
WHERE col1 IS NOT NULL
AND col2 IS NOT NULL
-- ...
AND coln IS NOT NULL

更新:根据你的评论，也许你想要这个?

SELECT * FROM
(
    SELECT col1 AS col FROM yourtable
    UNION
    SELECT col2 AS col FROM yourtable
    UNION
    -- ...
    UNION
    SELECT coln AS col FROM yourtable
) T1
WHERE col IS NOT NULL

我同意Martin的观点，如果你需要这样做，那么你可能应该改变你的数据库设计。

SELECT duration,id FROM `tickets` WHERE duration !=""

Mysql不是空的连接和选择，插入，删除和逻辑操作符像或，不是

Using IS NOT NULL On Join Conditions

 SELECT * FROM users 
 LEFT JOIN posts ON post.user_id = users.id 
 WHERE user_id IS NOT NULL;

 Using IS NOT NULL With AND Logical Operator

 SELECT * FROM users 
 WHERE email_address IS NOT NULL 
 AND mobile_number IS NOT NULL;

Using IS NOT NULL With OR Logical Operator

 SELECT * FROM users 
 WHERE email_address IS NOT NULL 
 OR mobile_number IS NOT NULL;

哪里的coalesce(所有的列)不是空的