Mysql Nested Select
Mysql Nested Select is a SELECT query that is nested within a Select, Update,
Insert or Delete SQL query.
Understand with Example:
The Tutorial illustrate an example from 'MySQL Nested Select'. To understand
and elaborate example we create a table 'MyTable' that has the required
fieldnames and datatypes respectively.
Query for creating table:
mysql> CREATE TABLE MyTable (
-> Empid int(10),
-> Empname varchar(60)
-> Salary int(90)
-> );
Query OK, 0 rows affected (0.13 sec)
|
Query for inserting data in table:
The Query insert into adds the records to the table 'MyTable'.
mysql> insert into MyTable values(01,'Girish','20000');
Query OK, 1 row affected (0.02 sec)
mysql> insert into MyTable values(02,'A','21000');
Query OK, 1 row affected (0.01 sec)
mysql> insert into MyTable values(03,'C','22000');
Query OK, 1 row affected (0.00 sec)
mysql> insert into MyTable values(04,'V','23000');
Query OK, 1 row affected (0.00 sec)
mysql> insert into MyTable values(05,'B','24000');
Query OK, 1 row affected (0.00 sec)
mysql> insert into MyTable values(06,'E','25000');
Query OK, 1 row affected (0.00 sec)
mysql> insert into MyTable values(07,'Q','26000');
Query OK, 1 row affected (0.01 sec)
mysql> insert into MyTable values(08,'W','27000');
Query OK, 1 row affected (0.01 sec)
mysql> insert into MyTable values(09,'AS','28000');
Query OK, 1 row affected (0.00 sec)`
|
Query to view data inserted in table:
The Query is used to return the detail of the records from table 'mytable'.
mysql> select * from mytable;
+-------+---------+--------+
| Empid | Empname | Salary |
+-------+---------+--------+
| 1 | Girish | 20000 |
| 2 | A | 21000 |
| 3 | C | 22000 |
| 4 | V | 23000 |
| 5 | B | 24000 |
| 6 | E | 25000 |
| 7 | Q | 26000 |
| 8 | W | 27000 |
| 9 | AS | 28000 |
+-------+---------+--------+
9 rows in set (0.01 sec)
|
Query for creating table name Employee:
We create another table 'Employee' that has the required fieldnames
and datatypes respectively.
mysql> CREATE TABLE Employee(
-> Empid int(10),
-> Empname varchar(60),
-> Salary int(90),
-> DOB date
-> );
Query OK, 0 rows affected (0.01 sec)
|
Query for insertion of data in table:
The Query insert into adds the records or rows to the table
'Employee'.
mysql> INSERT INTO Employee (Empid,Empname,Salary,DOB) VALUES
-> (01,'Habib',2014,20041202),
-> (02,'Karan',4021,20030411),
-> (03,'Samia', 22,20080223),
-> (04,'Hui Ling', 25,20081015),
-> (05,'Yumie', 29,19990126);
Query OK, 5 rows affected (0.00 sec)
Records: 5 Duplicates: 0 Warnings: 0
|
Query to view data inserted in table:
mysql> select * from employee;
|
Output:
+-------+----------+--------+------------+
| Empid | Empname | Salary | DOB |
+-------+----------+--------+------------+
| 1 | Habib | 2014 | 2004-12-02 |
| 2 | Karan | 4021 | 2003-04-11 |
| 3 | Samia | 22 | 2008-02-23 |
| 4 | Hui Ling | 25 | 2008-10-15 |
| 5 | Yumie | 29 | 1999-01-26 |
+-------+----------+--------+------------+
5 rows in set (0.00 sec)
|
Query for Mysql nested select:
The Nested Query is used to return those records from 'mytable' which
are nested select query of table employee in the Where Clause.
mysql> SELECT * FROM mytable WHERE Empid in(SELECT Empid FROM employee);
|
Output:-
+-------+---------+--------+
| Empid | Empname | Salary |
+-------+---------+--------+
| 1 | Girish | 20000 |
| 2 | A | 21000 |
| 3 | C | 22000 |
| 4 | V | 23000 |
| 5 | B | 24000 |
+-------+---------+--------+
5 rows in set (0.00 sec)
|
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