MySQL SELECT only not null values

Question

Is it possible to do a select statement that takes only NOT NULL values   Right now I am using this   SELECT   FROM table   And then I have to filter out the null values with a php loop   Is there a way to do   SELECT    that are NOT NULL  FROM table      Right now when I select   I get val1 val2 val3 null val4 val5 null null etc     but I just want to get the values that are not null in my result  Is this possible without filtering with a loop

User · Answer

Following query working for me

when i have set default value of column 'NULL' then

select * from table where column IS NOT NULL

and when i have set default value nothing then

select * from table where column <>''

User · Answer

You should use IS NOT NULL   The comparison operators   and  lt  gt  both give UNKNOWN with NULL on either side of the expression    SELECT    FROM table  WHERE YourColumn IS NOT NULL    Just for completeness I ll mention that in MySQL you can also negate the null safe equality operator but this is not standard SQL   SELECT   FROM table  WHERE NOT  YourColumn  lt   gt  NULL     Edited to reflect comments  It sounds like your table may not be in first normal form in which case changing the structure may make your task easier  A couple of other ways of doing it though     SELECT val1 AS val FROM  your table WHERE val1 IS NOT NULL UNION ALL SELECT val2  FROM  your table WHERE val2 IS NOT NULL   And so on for all your columns     The disadvantage of the above is that it scans the table multiple times once for each column  That may possibly be avoided by the below but I haven t tested this in MySQL   SELECT CASE idx          WHEN 1 THEN val1          WHEN 2 THEN val2        END AS val FROM   your table           CROSS JOIN          JOIN  SELECT 1 AS idx                    UNION ALL                    SELECT 2  t HAVING val IS NOT NULL    Can reference alias in Having in MySQL

User · Answer

Select   from your table  WHERE col1 and col2 and col3 and col4 and col5 IS NOT NULL    The only disadvantage of this approach is that you can only compare 5 columns  after that the result will always be false  so I do compare only the fields that can be NULL

User · Answer

Yes use NOT NULL in your query like this below   SELECT    FROM table WHERE col IS NOT NULL

User · Answer

You can filter out rows that contain a NULL value in a specific column   SELECT col1  col2       coln FROM yourtable WHERE somecolumn IS NOT NULL   If you want to filter out rows that contain a null in any column then try this   SELECT col1  col2       coln FROM yourtable WHERE col1 IS NOT NULL AND col2 IS NOT NULL --     AND coln IS NOT NULL     Update  Based on your comments  perhaps you want this   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   And I agre with Martin that if you need to do this then you should probably change your database design

User · Answer

I use the    command within MySQL to grep out NULL values from the shell      mysql -e  SELECT   FROM table WHERE column   123456 G    grep -v NULL   It works best with a proper  my cnf where your database username password are specified  That way you just have to surround your select with    mysql e and   grep -v NULL

User · Answer

SELECT   FROM TABLE NAME where COLUMN NAME  lt  gt

User · Answer

I found this solution   This query select last not null value for each column   Example    If you have a table   id title body 1  t1    b1 2  NULL  b2 3  t3    NULL   you get   title body t3    b2   Query    SELECT DISTINCT      SELECT title   FROM test   WHERE title IS NOT NULL    ORDER BY id DESC    LIMIT 1   title       SELECT body   FROM test   WHERE body IS NOT NULL    ORDER BY id DESC    LIMIT 1   body FROM test   I hope help you

User · Answer

MYSQL IS NOT NULL WITH JOINS AND SELECT  INSERT INTO  DELETE  amp  LOGICAL OPERATOR LIKE OR   NOT  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

[mysql] MySQL SELECT only not null values

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