Get first date from timestamp in MySQL group by another column with duplicate value

MySQLMySQLi Database

For this, you can use aggregate function MIN() and GROUP BY. Let us first create a table −

mysql> create table DemoTable1870
     (
     Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
     Value int,
     ShippingTimestamp varchar(100)
     );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1870(Value,ShippingTimestamp) values(10,'1570645800');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1870(Value,ShippingTimestamp) values(10,'1546194600');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1870(Value,ShippingTimestamp) values(11,'1573324200');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1870(Value,ShippingTimestamp) values(11,'1557599400');
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1870;

This will produce the following output −

+----+-------+-------------------+
| Id | Value | ShippingTimestamp |
+----+-------+-------------------+
|  1 |    10 | 1570645800        |
|  2 |    10 | 1546194600        |
|  3 |    11 | 1573324200        |
|  4 |    11 | 1557599400        |
+----+-------+-------------------+
4 rows in set (0.00 sec)

Here is the query to get first date from timestamp in MySQL &Minus;

mysql> select min(ShippingTimestamp) from DemoTable1870 group by Value;

This will produce the following output −

+------------------------+
| min(ShippingTimestamp) |
+------------------------+
| 1546194600             |
| 1557599400             |
+------------------------+
2 rows in set (0.00 sec)
raja
Published on 27-Dec-2019 06:04:31
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