GROUP BY and display only non-empty column values in MySQL

Let us first create a table −

mysql> create table DemoTable
   -> (
   -> Id varchar(100),
   -> Message varchar(200)
   -> );
Query OK, 0 rows affected (1.17 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('1','');
Query OK, 1 row affected (0.23 sec)

mysql> insert into DemoTable values('1','Hi');
Query OK, 1 row affected (0.21 sec)

mysql> insert into DemoTable values('2','Hello');
Query OK, 1 row affected (0.15 sec)

mysql> insert into DemoTable values('3','Awesome');
Query OK, 1 row affected (0.18 sec)

mysql> insert into DemoTable values('3','Good Morning');
Query OK, 1 row affected (0.11 sec)

mysql> insert into DemoTable values('2',NULL);
Query OK, 1 row affected (0.15 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Output

+------+--------------+
| Id   | Message      |
+------+--------------+
| 1    |              |
| 1    | Hi           |
| 2    | Hello        |
| 3    | Awesome      |
| 3    | Good Morning |
| 2    | NULL         |
+------+--------------+
6 rows in set (0.00 sec)

Following is the query to group by and select first non-empty columns −

mysql> select Id,min(Message) from DemoTable
   -> where Message IS NOT NULL and  length(Message) > 0
   -> group by Id;

Output

+------+--------------+
| Id   | min(Message) |
+------+--------------+
| 1    | Hi           |
| 2    | Hello        |
| 3    | Awesome      |
+------+--------------+
3 rows in set (0.06 sec)

Rama Giri

Published on 10-Jul-2019 12:00:08

• Related Questions & Answers
• Return only the non-empty and non-null values from a table and fill the empty and NULL values with the corresponding column values in MySQL?
• MySQL query to display only the empty and NULL values together?
• Need help selecting non-empty column values from MySQL?
• MySQL query to group by column and display the sum of similar values in another column
• Display the record with non-duplicate Id using MySQL GROUP BY and HAVING
• Find and display duplicate values only once from a column in MySQL
• How to select only non - numeric values from varchar column in MySQL?
• Group by one column and display corresponding records from another column with a separator in MySQL
• MySQL query to group by names and display the count in a new column
• MySQL query to display only the column values with corresponding column having whitespace
• Looping in JavaScript to count non-null and non-empty values
• Query non-empty values of a row first in ascending order and then display NULL values
• MySQL query to group results by date and display the count of duplicate values?
• Python – Display only non-duplicate values from a DataFrame
• MySQL query to select rows where column value is only 0, group by another column?