Answer / amith

The front layer takes care of network connections and
security authentications, the middle layer does the SQL
query parsing, and then the query is handled off to the
storage engine.

A storage engine could be either a default one supplied
with MySQL (MyISAM) or a commercial one supplied by a third-
party vendor (ScaleDB, InnoDB, etc.)

mysql> select * from store; +------+-------+-------+ | id | month | sales | +------+-------+-------+ | 1 | 1 | 100 | | 1 | 2 | 100 | | 1 | 3 | 200 | | 1 | 4 | 300 | | 1 | 5 | NULL | | 1 | 6 | 200 | | 1 | 7 | 800 | | 1 | 8 | 100 | | 1 | 9 | 240 | | 1 | 10 | 140 | | 1 | 11 | 400 | | 1 | 12 | 300 | | 2 | 1 | 300 | | 2 | 2 | 300 | | 2 | 3 | 300 | | 2 | 4 | 200 | | 2 | 5 | 200 | | 2 | 6 | 200 | | 2 | 7 | 100 | | 2 | 8 | 100 | | 2 | 9 | 300 | | 2 | 10 | 100 | | 2 | 11 | 150 | | 2 | 12 | 150 | +------+-------+-------+ this is my table. i need to display output like this. +------+----------+----------+----------+----------+ | id | quarter1 | quarter2 | quarter3 | quarter4 | +------+----------+----------+----------+----------+ | 1 | 400 | 500 | 1140 | 840 | | 2 | 900 | 600 | 500 | 400 | +------+----------+----------+----------+----------+ what single query i have to write for this. i tried this query and it displays like the below mysql> select id,sum(sales) as quarter1,(select sum(sales) from store where mont h>3 and month<7 ) as quarter2,(select sum(sales) from store where month>6 and mo nth<10)as quarter3 from store where month>0 and month<4 group by id; +------+----------+----------+----------+ | id | quarter1 | quarter2 | quarter3 | +------+----------+----------+----------+ | 1 | 400 | 1100 | 1640 | | 2 | 900 | 1100 | 1640 | +------+----------+----------+----------+ 2 rows in set (0.00 sec) tel me how to rectify it.

2 Answers  

---

Write a query to retrieve a hundred books starting from 20th.

0 Answers  

---

Is postgresql better than mysql?

0 Answers  

---

How can we know the number of days between two given dates using MySQL?

2 Answers   Base2 Infotech, Webworks,

---

How do I setup a mysql database?

0 Answers  

---

How to add a new column to an existing table in mysql?

0 Answers  

---

Does mysql support sequence?

0 Answers  

---

How do I rename a table in mysql workbench?

0 Answers  

---

What is the insert?

0 Answers  

---

Which software is used for mysql?

0 Answers  

---

What is root password?

0 Answers  

---

Why does mysql have so many connections?

0 Answers  

---