I am working with a TABLE, need logical help.
Check the below URL for the table structure and sample data.
http://sqlfiddle.com/#!2/ece06/2
Table Schema:
JavaScript
x
CREATE TABLE test (
ID INTEGER,
NAME VARCHAR (50),
VALUE INTEGER
);
Inserted Data:
JavaScript
INSERT INTO test VALUES (1, 'A', 4);
INSERT INTO test VALUES (1, 'B', 5);
INSERT INTO test VALUES (1, 'C', 8);
INSERT INTO test VALUES (2, 'D', 9);
INSERT INTO test VALUES (2, 'E', 9);
INSERT INTO test VALUES (3, 'F', 9);
INSERT INTO test VALUES (3, 'G', 9);
INSERT INTO test VALUES (3, 'H', 9);
INSERT INTO test VALUES (3, 'I', 9);
Query:
JavaScript
SELECT ID, GROUP_CONCAT(NAME) AS CODE
FROM test
GROUP BY ID;
OutPUT:
JavaScript
ID CODE
1 A,B,C
2 D,E
3 F,G,H,I
Expected OUTPUT:
JavaScript
ID CODE CODE CODE CODE
1 A B C NULL
2 D E NULL NULL
3 F G H I
As you can see the output of the query has concat with comma. And currently we are doing string concat using PHP which splits while displaying!!
Is there any other way to split the RESULT and show each value in column and same ROW? In same result?
Note: The CODE might vary for each ROW.
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Answer
With Help from my colleague We arrived at a point to solve this senario. Hope some one might needed it.. It is welcome if some one make it much simpler.
JavaScript
BEGIN
SET @v=0;
SET @v1=0;
SELECT tmp.cnt INTO @v
FROM
(SELECT Id,
count(ID) AS cnt,
GROUP_CONCAT(name)
FROM test
GROUP BY id) tmp
ORDER BY tmp.cnt DESC LIMIT 1;
SET @str=' ';
WHILE(@v>@v1) DO
SET @v1=@v1+1;
IF(@str='') THEN
SET @str=CONCAT(@str,'ID, REPLACE(SUBSTRING(SUBSTRING_INDEX(GROUP_CONCAT(NAME), '','',', @v1,'),LENGTH(SUBSTRING_INDEX(GROUP_CONCAT(NAME),'','',', @v1,'-1)) + 1),'','','''') AS Code' ,@v1);
ELSE
SET @str= CONCAT(@str,',REPLACE(SUBSTRING(SUBSTRING_INDEX(GROUP_CONCAT(NAME),'','',', @v1,'),LENGTH(SUBSTRING_INDEX(GROUP_CONCAT(NAME),'','',' , @v1,' -1)) + 1),'','','''') AS Code',@v1);
END IF;
END WHILE;
SET @str=CONCAT('SELECT ' , @str, ' FROM test GROUP BY ID');
PREPARE MYSQLQUERY
FROM @str;
EXECUTE MYSQLQUERY;
DEALLOCATE PREPARE MYSQLQUERY;
END