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Selecting a single row in MySQL?
If you want to select a single row on the basis of primary key, use the WHERE clause. The syntax is as follows −
SELECT * FROM yourTableName WHERE yourPrimaryKeyColumnName = someValue;
To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table selectWithPrimaryKey -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> Age int, -> Marks int, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.78 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('Larry',24,98);
Query OK, 1 row affected (0.15 sec)
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('John',23,89);
Query OK, 1 row affected (0.21 sec)
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('Mike',21,85);
Query OK, 1 row affected (0.18 sec)
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('Sam',26,56);
Query OK, 1 row affected (0.18 sec)
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('Carol',21,59);
Query OK, 1 row affected (0.18 sec)
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('Bob',20,91);
Query OK, 1 row affected (0.21 sec)
mysql> insert into selectWithPrimaryKey(Name,Age,Marks) values('David',28,93);
Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement. The query is as follows −
mysql> select *from selectWithPrimaryKey;
The following is the output −
+----+-------+------+-------+ | Id | Name | Age | Marks | +----+-------+------+-------+ | 1 | Larry | 24 | 98 | | 2 | John | 23 | 89 | | 3 | Mike | 21 | 85 | | 4 | Sam | 26 | 56 | | 5 | Carol | 21 | 59 | | 6 | Bob | 20 | 91 | | 7 | David | 28 | 93 | +----+-------+------+-------+ 7 rows in set (0.00 sec)
The following is the query to select a single row from the table −
mysql> select *from selectWithPrimaryKey where Id = 6;
Here is the output −
+----+------+------+-------+ | Id | Name | Age | Marks | +----+------+------+-------+ | 6 | Bob | 20 | 91 | +----+------+------+-------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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