Select clause with condition : Select « Select Clause « SQL / MySQL

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SQL / MySQL » Select Clause » Select 
Select clause with condition
  
/*mysql> select * from employee;
+----+-----------+----------+----------------------------+------+---------------+--------+-------+---------------------+
| id | firstname | lastname | title                      | age  | yearofservice| salary | perks | email               |
+----+-----------+----------+----------------------------+------+---------------+--------+-------+---------------------+
|  1 | John      | Chen     | Senior Programmer          |   31 |             3| 120000 | 25000 | [email protected]       |
|  2 | Jan       | Pillai   | Senior Programmer          |   32 |             4| 110000 | 20000 | [email protected]         |
|  3 | Ane       | Pandit   | Web Designer               |   24 |             3|  90000 | 15000 | [email protected]         |
|  4 | Mary      | Anchor   | Web Designer               |   27 |             2|  85000 | 15000 | [email protected]          |
|  5 | Fred      | King     | Programmer                 |   32 |             3|  75000 | 15000 | [email protected]           |
|  6 | John      | Mac      | Programmer                 |   32 |             4|  80000 | 16000 | [email protected]       |
|  7 | Arthur    | Sam      | Programmer                 |   28 |             2|  75000 | 14000 | [email protected]         |
|  8 | Alok      | Nanda    | Programmer                 |   32 |             3|  70000 | 10000 | [email protected]         |
|  9 | Susan     | Ra       | Multimedia Programmer      |   32 |             4|  90000 | 15000 | [email protected]         |
| 10 | Paul      | Simon    | Multimedia Programmer      |   23 |             1|  85000 | 12000 | [email protected]        |
| 11 | Edward    | Parhar   | Multimedia Programmer      |   30 |             2|  75000 | 15000 | [email protected]       |
| 12 | Kim       | Hunter   | Senior Web Designer        |   32 |             4| 110000 | 20000 | [email protected]    |
| 13 | Roger     | Lewis    | System Administrator       |   32 |             3| 100000 | 13000 | [email protected]      |
| 14 | Danny     | Gibson   | System Administrator       |   31 |             2|  90000 | 12000 | [email protected]   |
| 15 | Mike      | Harper   | Senior Marketing Executive |   36 |             1| 120000 | 28000 | [email protected]         |
| 16 | Mary      | Sunday   | Marketing Executive        |   31 |             5|  90000 | 25000 | [email protected]  |
| 17 | Jack      | Sim      | Marketing Executive        |   27 |             1|  70000 | 18000 | [email protected]       |
| 18 | Joe       | Irvine   | Marketing Executive        |   27 |             1|  72000 | 18000 | [email protected]  |
| 19 | Henry     | Ali      | Customer Service Manager   |   32 |             3|  70000 |  9000 | [email protected] |
| 20 | Peter     | Champion | Finance Manager            |   32 |             2| 120000 | 25000 | [email protected]     |
+----+-----------+----------+----------------------------+------+---------------+--------+-------+---------------------+
20 rows in set (0.00 sec)

mysql> SELECT firstname, lastName from employee where age > 32;
+-----------+----------+
| firstname | lastName |
+-----------+----------+
| Mike      | Harper   |
+-----------+----------+
1 row in set (0.00 sec)

*/
Drop table employee;

CREATE TABLE employee (
    id int unsigned not null auto_increment primary key,
    firstname varchar(20),
    lastname varchar(20),
    title varchar(30),
    age int,
    yearofservice int,
    salary int,
    perks int,
    email varchar(60)
)



INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("John""Chen""Senior Programmer"31312000025000"[email protected]");

INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Jan""Pillai""Senior Programmer"32411000020000"[email protected]");

INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Ane""Pandit""Web Designer"2439000015000"[email protected]");

INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Mary""Anchor""Web Designer"2728500015000"[email protected]");

INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Fred""King""Programmer"3237500015000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("John""Mac""Programmer"3248000016000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Arthur""Sam""Programmer"2827500014000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Alok""Nanda""Programmer"3237000010000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Susan""Ra""Multimedia Programmer"3249000015000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Paul""Simon""Multimedia Programmer"2318500012000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Edward""Parhar""Multimedia Programmer"3027500015000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Kim""Hunter""Senior Web Designer"32411000020000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Roger""Lewis""System Administrator"32310000013000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Danny""Gibson""System Administrator"3129000012000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Mike""Harper""Senior Marketing Executive"36112000028000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Mary""Sunday""Marketing Executive"3159000025000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Jack""Sim""Marketing Executive"2717000018000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Joe""Irvine""Marketing Executive"2717200018000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Henry""Ali""Customer Service Manager"323700009000"[email protected]");
INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, emailvalues ("Peter""Champion""Finance Manager"32212000025000"[email protected]");

select from employee;
  
SELECT firstname, lastName from employee where age > 32;
           
         
    
  
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2.Use defined variable in new select clause
3.Choose specific columns
4.Reference column in select command
5.Performing Mathematics
6.Simple Retrieval:Returning Multiple Columns
7.Simple Retrieval:Returning a Single Column
8.Simple Retrieval: Returning All Columns
9.Performing a Single Row INSERT
10.Retrieve all columns in a table
11.Using constant string value as comment message for aggregate function
12.Calculation
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