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How to group by column name and ensure the query retrieves the last update in MySQL?
Let us first create a table −
mysql> create table DemoTable621 (UserName varchar(100),UserEmailId varchar(100),UserLastPost datetime); Query OK, 0 rows affected (0.59 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable621 values('John','John@gmail.com','2019-04-10 11:01:10'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable621 values('John','John@gmail.com','2019-07-14 13:07:10'); Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable621;
This will produce the following output −
+----------+----------------+---------------------+ | UserName | UserEmailId | UserLastPost | +----------+----------------+---------------------+ | John | John@gmail.com | 2019-04-10 11:01:10 | | John | John@gmail.com | 2019-07-14 13:07:10 | +----------+----------------+---------------------+ 2 rows in set (0.00 sec)
Following is the query to group by column name and ensure the query retrieves the last update −
mysql> select UserName,UserEmailId,max(UserLastPost) from DemoTable621 group by UserName,UserEmailId;
This will produce the following output −
+----------+----------------+---------------------+ | UserName | UserEmailId | max(UserLastPost) | +----------+----------------+---------------------+ | John | John@gmail.com | 2019-07-14 13:07:10 | +----------+----------------+---------------------+ 1 row in set (0.19 sec)
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