Get only a single value from a specific MySQL row?
For this, use SELECT INTO variable with where clause. Let us first create a table −
mysql> create table DemoTable1896
(
StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
StudentName varchar(20),
StudentMarks int
);
Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1896(StudentName,StudentMarks) values('Chris',56);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1896(StudentName,StudentMarks) values('David',98);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1896(StudentName,StudentMarks) values('Mike',89);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1896(StudentName,StudentMarks) values('Sam',78);
Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1896;
This will produce the following output −
+-----------+-------------+--------------+
| StudentId | StudentName | StudentMarks |
+-----------+-------------+--------------+
| 1 | Chris | 56 |
| 2 | David | 98 |
| 3 | Mike | 89 |
| 4 | Sam | 78 |
+-----------+-------------+--------------+
4 rows in set (0.00 sec)
Here is the query to get value from a specific MySQL row −
mysql> set @Name:=NULL;
Query OK, 0 rows affected (0.00 sec)
mysql> select StudentName into @Name from DemoTable1896 where StudentMarks=98;
Query OK, 1 row affected (0.00 sec)
Now you can display the value of the above variable −
mysql> select @Name;
This will produce the following output −
+-------+
| @Name |
+-------+
| David |
+-------+
1 row in set (0.00 sec)
Published on 27-Dec-2019 11:32:32
