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Selecting and displaying only some rows from a column in a MySQL table
Let us first create a table −
mysql> create table DemoTable625 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,StudentFirstName varchar(100),StudentScore int ); Query OK, 0 rows affected (1.01 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable625(StudentFirstName,StudentScore) values('John',98); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable625(StudentFirstName,StudentScore) values('Chris',39); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable625(StudentFirstName,StudentScore) values('Bob',41); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable625(StudentFirstName,StudentScore) values('David',40); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable625(StudentFirstName,StudentScore) values('Robert',52); Query OK, 1 row affected (0.18 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable625;
This will produce the following output −
+-----------+------------------+--------------+ | StudentId | StudentFirstName | StudentScore | +-----------+------------------+--------------+ | 1 | John | 98 | | 2 | Chris | 39 | | 3 | Bob | 41 | | 4 | David | 40 | | 5 | Robert | 52 | +-----------+------------------+--------------+ 5 rows in set (0.00 sec)
Here is the query to select and display only some rows −
mysql> select *from DemoTable625 where StudentFirstName NOT IN( select StudentFirstName from DemoTable625 where StudentScore < 50 );
This will produce the following output −
+-----------+------------------+--------------+ | StudentId | StudentFirstName | StudentScore | +-----------+------------------+--------------+ | 1 | John | 98 | | 5 | Robert | 52 | +-----------+------------------+--------------+ 2 rows in set (0.00 sec)
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