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How to compare the first date and the last date from a MySQL column with date records?
To compare the first date with the last date, use TIME_TO_SEC() along with MAX() and MIN(). Let us first create a table −
mysql> create table DemoTable ( UserName varchar(100), UserPostDatetime datetime ); Query OK, 0 rows affected (0.65 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Adam','2019-08-24 11:10:00');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Adam','2019-08-24 11:20:00');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable values('Adam','2019-08-24 11:50:00');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----------+---------------------+ | UserName | UserPostDatetime | +----------+---------------------+ | Adam | 2019-08-24 11:10:00 | | Adam | 2019-08-24 11:20:00 | | Adam | 2019-08-24 11:50:00 | +----------+---------------------+ 3 rows in set (0.00 sec)
Following is the query to compare the first date and the last date −
mysql> select UserName,sec_to_time(max(time_to_sec(UserPostDatetime))-min(time_to_sec(UserPostDatetime)))t from DemoTable group by UserName;
This will produce the following output −
+----------+----------+ | UserName | t | +----------+----------+ | Adam | 00:40:00 | +----------+----------+ 1 row in set (0.03 sec)
Updated on 30-Sep-2019 07:49:45
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