group-concat

问题 by followed Mysql query to dynamically convert rows to columns on the basis of two columns, I have 4 table to convert dinamiacally rows into columns as RESULT TABLE A | id | stages | -----+---------- | 1 | Stage A | | 2 | Stage B | | 3 | Stage C | TABLE B | id_b | code | lessons | -------+------+-------------- | 10 | FIS | Physics | | 11 | MAT | Mathematics | | 12 | KIM | Chemistry | | 13 | BIO | Biology | TABLE C |id_c| students | -----+------------- | 20 | student 20 | | 21 | student 21 | |

问题 options_table options_id | object_id | option_value ========================================= 1 | 1 | drink 2 | 2 | ice 3 | 1 | bath 4 | 2 | soda 5 | 2 | drink 6 | 3 | ice 7 | 4 | bath 8 | 2 | bath 9 | 1 | storm object_table object_id | object_name ============================= 1 | sun 2 | moon 3 | mars 4 | jupiter The Query SELECT object_table.object_name GROUP_CONCAT(options_table.option_value ) as object_options FROM options_table LEFT JOIN object_table ON object_table.object_id = options

问题 I have a user table from which I want all values, so I have this query: SELECT tbl_user.* FROM tbl_user Now I want one additional column in this result which shows all roles this user has, (or nothing if there are no roles for the user). The role information comes from two additional tables. The first table contains these two values: userid, roleid The second table contains roleid and role_name. So the group concat needs to get all role names based on the roleid's in table1. I have tried

问题 This is Result of two table using GROUP_CONCAT() for columns content_ids and content_titles and this data is separated with a ',' separator What i need is? Using php the values must be stored in a array and should print at using a loop. can anyone help me? thanks. 回答1: Retrieve your data usual way. Then, after reading particular comma-separated field, use explode() to get an array out of it. That's all 来源： https://stackoverflow.com/questions/15334632/retrive-data-from-table-with-has-group

问题 I need to join two MySQL tables - events & people, but I see problem when I have multiple people leading the same event. PEOPLE ================= ID|Name |Surname|.... -------------------- 1|John |Lennon 2|Paul |McCartney 3|George|Harisson 4|Ringo |Starr Is there any possible way to get concat of 1 & 2, if the event table is something like EVENTS ================= event |leader|.... ----------------- Picnic|1+2 I do want some events to have only one leader, but also some with more than 2. Is

问题 I have tried mysql ststement for dinamically rows to column by followed here with query statement: SET @sql = NULL; SELECT GROUP_CONCAT(DISTINCT CONCAT( 'MAX(CASE WHEN col = ''', col, ''' THEN val END) as `', col, '`' ) )INTO @sql FROM ( SELECT A.id_a, D.id_c id_c, C.students students, CONCAT(B.`code`, '_', A.id_a) col, CONCAT(D.value_m, ',', D.value_n) val FROM table_a A INNER JOIN table_d D ON A.id_a =D.id_a INNER JOIN table_b B ON D.id_b=B.id_b INNER JOIN table_c C ON D.id_c=C.id_c )dd;

问题 I've got a query that retrieves from tables using group_concat so that I dont have repititions. 'SELECT book_name, chapter_slug, GROUP_CONCAT(chapter_name SEPARATOR "<br/>") as ChapterNames FROM ci_books, ci_chapters WHERE ci_books.book_id = ci_chapters.book_id AND slug = ' . $conn->quote($slug). ' GROUP BY book_name;' Now the results are separated which is good because I want to add hyperlinks to each however I am only getting one row that means the hyperlink is the same for all the

问题 I'm moving our backend database from mysql to postgres and am in the process of migrating all of our old queries / functions. Most of them are trivial to do, but today I ran across one that has me scratching my head. Here it is: UPDATE k_coderound AS cr, k_coderound AS cr_m SET cr.is_correct = IF( (SELECT GROUP_CONCAT(option_id ORDER BY variable_id) AS `values` FROM k_value WHERE code_round_id=cr.id GROUP BY code_round_id) = (SELECT GROUP_CONCAT(option_id ORDER BY variable_id) AS `values`

问题 i have a data in a table, column id and column date id || datetime 1 || 2013-05-24 19:23:16 2 || 2013-05-28 19:24:20 3 || 2013-05-28 19:25:05 4 || 2013-05-30 19:25:39 5 || 2013-05-30 19:26:05 how query to show only one day with count?or one row with count. so the result is. || datetime || count 1 || 2013-05-24 19:23:16 || 1 2 || 2013-05-28 19:24:20 || 2 3 || 2013-05-30 19:25:39 || 2 i try in mysql and it works , there is my query. SELECT id, GROUP_CONCAT( datetime ) AS date, COUNT( id ) AS

问题 I have table: id, day, user, value, active And now i get SELECT day from ppl GROUP BY user but! i want to get all days in one row, not only one for example day: 1,2,3,4,5,6,7,8,9... user: myusername is it possible? Yep, SELECT user, GROUP_CONCAT(day) day FROM ppl GROUP BY 1; Is answer for my question, but i've got next, last Here is result of query http://screenshooter.net/0562655/24_05_2012__22_37_09 how to change row 3 from 8,9,10 to 8-10 row 5 from 21,22,23,24,28,29,30 to 21-24,28-30 row 6