Home > Developer > PHP

Summary of mysql row and column conversion methods

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
To switch to bbs. csdn. nettopics310045927, cross tabulation exists in some databases, but this feature is not available in MySQL. However, many friends on the Internet want to find a solution, in a broad sense. Yes or no. Data Sample: createtabletx (idintprimarykey, c1char (2), c2char (2), c3int); inser

Turn to http://bbs.csdn.net/topics/310045927 in some databases have a cross table, but in MySQL does not have this function, but the Internet saw a lot of friends want to find a solution, thji Si broad sense. Yes or no. Data Sample: createtabletx (idintprimarykey, c1char (2), c2char (2), c3int); inser

Zookeeper

Transfer http://bbs.csdn.net/topics/310045927

In some databases, there are cross tables, but this function is not available in MySQL. However, many friends on the Internet want to find a solution in a broad sense. Yes or no.

Data sample:
Create table tx (
Id int primary key,
C1 char (2 ),
C2 char (2 ),
C3 int
);

Insert into tx values
(1, 'a1', 'b1 ', 9 ),
(2, 'a2 ', 'b1', 7 ),
(3, 'a3 ', 'b1', 4 ),
(4, 'a4 ', 'b1', 2 ),
(5, 'a1', 'b2', 2 ),
(6, 'a2 ', 'b2', 9 ),
(7, 'a3 ', 'b2', 8 ),
(8, 'a4 ', 'b2', 5 ),
(9, 'a1', 'b3', 1 ),
(10, 'a2 ', 'b3', 8 ),
(11, 'a3 ', 'b3', 8 ),
(12, 'a4 ', 'b3', 6 ),
(13, 'a1', 'b4 ', 8 ),
(14, 'a2 ', 'b4', 2 ),
(15, 'a3 ', 'b4', 6 ),
(16, 'a4 ', 'b4', 9 ),
(17, 'a1', 'b4 ', 3 ),
(18, 'a2 ', 'b4', 5 ),
(19, 'a3 ', 'b4', 2 ),
(20, 'a4 ', 'b4', 5 );

Result (excluding rows/columns)
[Code = BatchFile] + ------ + ----- + ------ +
| C1 | B1 | B2 | B3 | B4 | Total |
+ ------ + ----- + ------ +
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| Total | 22 | 24 | 23 | 40 | 109 |
+ ------ + ----- + ------ + [/Code]


Method 1:

Mysql> SELECT
-> IFNULL (c1, 'Total') AS total,
-> SUM (IF (c2 = 'b1 ', c3, 0) AS B1,
-> SUM (IF (c2 = 'b2', c3, 0) AS B2,
-> SUM (IF (c2 = 'b3', c3, 0) AS B3,
-> SUM (IF (c2 = 'b4 ', c3, 0) AS B4,
-> SUM (IF (c2 = 'Total', c3, 0) AS total
-> FROM (
-> SELECT c1, IFNULL (c2, 'Total') AS c2, SUM (c3) AS c3
-> FROM tx
-> Group by c1, c2
-> WITH ROLLUP
-> HAVING c1 IS NOT NULL
->) AS
-> Group by c1
-> With rollup;

"Total", "B1", "B2", "B3", "B4", "total"
"A1", 9, 2, 1, 11, 23
"A2", 7, 9, 8, 7, 31
"A3", 4, 8, 8, 28
"A4", 2,5, 6,14, 27
"Total", 109

5 rows in set, 1 warning (0.00 sec)


Method 2:

Static:
Select c1,
Sum (if (c2 = 'b1 ', C3, 0) AS B1,
Sum (if (c2 = 'b2', C3, 0) AS B2,
Sum (if (c2 = 'b3', C3, 0) AS B3,
Sum (if (c2 = 'b4 ', C3, 0) AS B4, SUM (C3) AS TOTAL
From tx
Group by C1
UNION
SELECT 'Total', sum (if (c2 = 'b1 ', C3, 0) AS B1,
Sum (if (c2 = 'b2', C3, 0) AS B2,
Sum (if (c2 = 'b3', C3, 0) AS B3,
Sum (if (c2 = 'b4 ', C3, 0) AS B4, SUM (C3) FROM TX



Method 3:

Dynamic:
SET @ EE = '';
SELECT @ EE: = CONCAT (@ EE, 'sum (IF (C2 = \ '', C2, '\'',', C3, 0) AS ', C2, ',') FROM
(Select distinct C2 from tx);
SET @ QQ = CONCAT ('select ifnull (c1, \ 'total \ '),', LEFT (@ EE, LENGTH (@ EE)-1 ),', SUM (C3) as total from tx group by C1 with rollup ');
PREPARE stmt2 FROM @ QQ;
EXECUTE stmt2;


Method 4:


-- Wood has a total, passed the test under SQL Server

If object_id ('tempdb .. # tx ') is not null drop table # tx
Go
Create table # tx (
Id int primary key,
C1 char (2 ),
C2 char (2 ),
C3 int
);

Insert into # tx (id, c1, c2, c3) values (1, 'a1', 'b1 ', 9)
Insert into # tx (id, c1, c2, c3) values (2, 'a2 ', 'b1', 7)
Insert into # tx (id, c1, c2, c3) values (3, 'a3 ', 'b1', 4)
Insert into # tx (id, c1, c2, c3) values (4, 'a4 ', 'b1', 2)
Insert into # tx (id, c1, c2, c3) values (5, 'a1', 'b2', 2)
Insert into # tx (id, c1, c2, c3) values (6, 'a2 ', 'b2', 9)
Insert into # tx (id, c1, c2, c3) values (7, 'a3 ', 'b2', 8)
Insert into # tx (id, c1, c2, c3) values (8, 'a4 ', 'b2', 5)
Insert into # tx (id, c1, c2, c3) values (9, 'a1', 'b3', 1)
Insert into # tx (id, c1, c2, c3) values (10, 'a2 ', 'b3', 8)
Insert into # tx (id, c1, c2, c3) values (11, 'a3 ', 'b3', 8)
Insert into # tx (id, c1, c2, c3) values (12, 'a4 ', 'b3', 6)
Insert into # tx (id, c1, c2, c3) values (13, 'a1', 'b4 ', 8)
Insert into # tx (id, c1, c2, c3) values (14, 'a2 ', 'b4', 2)
Insert into # tx (id, c1, c2, c3) values (15, 'a3 ', 'b4', 6)
Insert into # tx (id, c1, c2, c3) values (16, 'a4 ', 'b4', 9)
Insert into # tx (id, c1, c2, c3) values (17, 'a1', 'b4 ', 3)
Insert into # tx (id, c1, c2, c3) values (18, 'a2 ', 'b4', 5)
Insert into # tx (id, c1, c2, c3) values (19, 'a3 ', 'b4', 2)
Insert into # tx (id, c1, c2, c3) values (20, 'a4 ', 'b4', 5)


SELECT c1
, Sum (CASE
WHEN c2 = 'b1 'THEN c3
ELSE 0
END) AS [b1]
, Sum (CASE
WHEN c2 = 'b2' THEN c3
ELSE 0
END) AS [b2]
, Sum (CASE
WHEN c2 = 'b3' THEN c3
ELSE 0
END) AS [b3]
, Sum (CASE
WHEN c2 = 'b4 'THEN c3
ELSE 0
END) AS [b4]
FROM # tx
Group by c1



Method 5:


-- Dynamic words

If object_id ('tempdb .. # tx ') is not null drop table # tx
Go
Create table # tx (
Id int primary key,
C1 char (2 ),
C2 char (2 ),
C3 int
);

Insert into # tx (id, c1, c2, c3) values (1, 'a1', 'b1 ', 9)
Insert into # tx (id, c1, c2, c3) values (2, 'a2 ', 'b1', 7)
Insert into # tx (id, c1, c2, c3) values (3, 'a3 ', 'b1', 4)
Insert into # tx (id, c1, c2, c3) values (4, 'a4 ', 'b1', 2)
Insert into # tx (id, c1, c2, c3) values (5, 'a1', 'b2', 2)
Insert into # tx (id, c1, c2, c3) values (6, 'a2 ', 'b2', 9)
Insert into # tx (id, c1, c2, c3) values (7, 'a3 ', 'b2', 8)
Insert into # tx (id, c1, c2, c3) values (8, 'a4 ', 'b2', 5)
Insert into # tx (id, c1, c2, c3) values (9, 'a1', 'b3', 1)
Insert into # tx (id, c1, c2, c3) values (10, 'a2 ', 'b3', 8)
Insert into # tx (id, c1, c2, c3) values (11, 'a3 ', 'b3', 8)
Insert into # tx (id, c1, c2, c3) values (12, 'a4 ', 'b3', 6)
Insert into # tx (id, c1, c2, c3) values (13, 'a1', 'b4 ', 8)
Insert into # tx (id, c1, c2, c3) values (14, 'a2 ', 'b4', 2)
Insert into # tx (id, c1, c2, c3) values (15, 'a3 ', 'b4', 6)
Insert into # tx (id, c1, c2, c3) values (16, 'a4 ', 'b4', 9)
Insert into # tx (id, c1, c2, c3) values (17, 'a1', 'b4 ', 3)
Insert into # tx (id, c1, c2, c3) values (18, 'a2 ', 'b4', 5)
Insert into # tx (id, c1, c2, c3) values (19, 'a3 ', 'b4', 2)
Insert into # tx (id, c1, c2, c3) values (20, 'a4 ', 'b4', 5)

Select * from # tx

Declare @ SQL varchar (8000)
Set @ SQL = 'select c1 ,'
Select @ SQL = @ SQL + 'sum (case when c2 = ''' + cast (c2 as varchar (10) + ''' then c3 else 0 end) ['+ cast (c2 as varchar (10) +'],'
From (select distinct c2 from # tx)
Print (@ SQL)

Set @ SQL = left (@ SQL, len (@ SQL)-1) + 'from # tx group by c1'
Exec (@ SQL)
If object_id ('tempdb .. # tx ') is not null drop table # tx

/*
A1 9 2 1 11
A2 7 9 8 7
A3 4 8 8 8
A4 2 5 6 14
*/



Test

1,

Mysql> SELECT
-> IFNULL (c1, 'Total') AS total,
-> SUM (IF (c2 = 'b1 ', c3, 0) AS B1,
-> SUM (IF (c2 = 'b2', c3, 0) AS B2,
-> SUM (IF (c2 = 'b3', c3, 0) AS B3,
-> SUM (IF (c2 = 'b4 ', c3, 0) AS B4,
-> SUM (IF (c2 = 'Total', c3, 0) AS total
-> FROM (
-> SELECT c1, IFNULL (c2, 'Total') AS c2, SUM (c3) AS c3
-> FROM tx
-> Group by c1, c2
-> WITH ROLLUP
-> HAVING c1 IS NOT NULL
->) AS
-> Group by c1
-> With rollup;
+ ------- + ------ + ------- +
| Total | B1 | B2 | B3 | B4 | total |
+ ------- + ------ + ------- +
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| Total | 22 | 24 | 23 | 40 | 109 |
+ ------- + ------ + ------- +
5 rows in set, 1 warning (0.00 sec)


2,

Mysql> select c1,
-> Sum (if (c2 = 'b1 ', C3, 0) AS B1,
-> Sum (if (c2 = 'b2', C3, 0) AS B2,
-> Sum (if (c2 = 'b3', C3, 0) AS B3,
-> Sum (if (c2 = 'b4 ', C3, 0) AS B4, SUM (C3) AS TOTAL
-> From tx
-> Group by C1
-> UNION
-> SELECT 'Total', sum (if (c2 = 'b1 ', C3, 0) AS B1,
-> Sum (if (c2 = 'b2', C3, 0) AS B2,
-> Sum (if (c2 = 'b3', C3, 0) AS B3,
-> Sum (if (c2 = 'b4 ', C3, 0) AS B4, SUM (C3) FROM TX
->;
+ ------- + ------ + ------- +
| C1 | B1 | B2 | B3 | B4 | TOTAL |
+ ------- + ------ + ------- +
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| TOTAL | 22 | 24 | 23 | 40 | 109 |
+ ------- + ------ + ------- +
5 rows in set (0.00 sec)

Mysql>


3,

Mysql> select ifnull (c1, 'Total '),
-> Sum (if (c2 = 'b1 ', C3, 0) AS B1,
-> Sum (if (c2 = 'b2', C3, 0) AS B2,
-> Sum (if (c2 = 'b3', C3, 0) AS B3,
-> Sum (if (c2 = 'b4 ', C3, 0) AS B4, SUM (C3) AS TOTAL
-> From tx
-> Group by C1 with rollup;
+ -------------------- + ------ + ------- +
| Ifnull (c1, 'Total') | B1 | B2 | B3 | B4 | total |
+ -------------------- + ------ + ------- +
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| Total | 22 | 24 | 23 | 40 | 109 |
+ -------------------- + ------ + ------- +
5 rows in set (0.00 sec)

Mysql>



4,
Mysql> SET @ EE = '';
Mysql> SELECT @ EE: = CONCAT (@ EE, 'sum (IF (C2 = \ '', C2, '\'',', C3, 0) ', c2, ',') FROM (select distinct C2 from tx);


Mysql> SET @ QQ = CONCAT ('select ifnull (c1, \ 'total \ '),', LEFT (@ EE, LENGTH (@ EE)-1 ),', SUM (C3) as total from tx group by C1 with rollup ');
Query OK, 0 rows affected (0.00 sec)

Mysql> PREPARE stmt2 FROM @ QQ;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

Mysql> EXECUTE stmt2;
+ -------------------- + ------ + ------- +
| Ifnull (c1, 'Total') | B1 | B2 | B3 | B4 | total |
+ -------------------- + ------ + ------- +
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| Total | 22 | 24 | 23 | 40 | 109 |
+ -------------------- + ------ + ------- +
5 rows in set (0.00 sec)

Mysql>




5,


Mysql> SET @ EE = '';
Mysql> SELECT @ EE: = CONCAT (@ EE, 'sum (IF (C2 = \ '', C2, '\'',', C3, 0) ', c2, ',') FROM (select distinct C2 from tx);


Mysql> SET @ QQ = CONCAT ('select ifnull (c1, \ 'total \ '),', LEFT (@ EE, LENGTH (@ EE)-1 ),', SUM (C3) as total from tx group by C1 with rollup ');
Query OK, 0 rows affected (0.00 sec)

Mysql> PREPARE stmt2 FROM @ QQ;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

Mysql> EXECUTE stmt2;
+ -------------------- + ------ + ------- +
| Ifnull (c1, 'Total') | B1 | B2 | B3 | B4 | total |
+ -------------------- + ------ + ------- +
| A1 | 9 | 2 | 1 | 11 | 23 |
| A2 | 7 | 9 | 8 | 7 | 31 |
| A3 | 4 | 8 | 8 | 8 | 28 |
| A4 | 2 | 5 | 6 | 14 | 27 |
| Total | 22 | 24 | 23 | 40 | 109 |
+ -------------------- + ------ + ------- +
5 rows in set (0.00 sec)

Mysql>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
database row column array row column oracle row to column column to row oracle sql row column shadow and claw summary row to column in oracle

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More