Get the maximum exam date using a user-defined variable in SQL
To get the maximum exam date with a user-defined variable, the code is as follows −
select date(max(yourColumnName )) into @yourVariableName from yourTableName;
To understand the above syntax, let us first create a table −
mysql> create table DemoTable2001
(
ExamDate date
);
Query OK, 0 rows affected (0.60 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2001 values('2019-01-10');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable2001 values('2018-12-31');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable2001 values('2018-11-18');
Query OK, 1 row affected (0.39 sec)
mysql> insert into DemoTable2001 values('2019-07-25');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select * from DemoTable2001;
This will produce the following output −
+------------+
| ExamDate |
+------------+
| 2019-01-10 |
| 2018-12-31 |
| 2018-11-18 |
| 2019-07-25 |
+------------+
4 rows in set (0.00 sec)
Here is the query to get the maximum date. We will first create a user-defined variable −
mysql> set @comingExamDate:=null;
Query OK, 0 rows affected (0.00 sec)
mysql> select date(max(ExamDate)) into @comingExamDate from DemoTable2001;
Query OK, 1 row affected (0.00 sec)
mysql> select @comingExamDate;
This will produce the following output −
+------------------+
| @commingExamDate |
+------------------+
| 2019-07-25 |
+------------------+
1 row in set (0.00 sec)
Published on 02-Jan-2020 10:08:55
