group-concat

问题 I have a join query where I left join 2 tables say tab_sector and tab_sector_subdivisions . I have records in first table which may or may not have corresponding records in 2nd table. I am joining these tables in such a way that Its should return all row from first table and matching row from 2nd table. Also if a row in first table has multiple record in 2nd table, it should return as GROUP_CONCAT(field_name) . But my query doesn't return the way I need. Here is the query without GROUP_CONCAT

问题 I have a query that searches through several tables and returns one row for every value in one specific column of one of the queried tables. The table returns multiple rows for one unique identifier. What I want to do is combine those rows that have the same unique identifier and combine 2 of the column's value separated by commas and return those values as a unique column. Example: Museum MuseumID Country City Paintings Sculptures Louvre 345 France Paris Mona Lisa NULL Louvre 345 France

问题 I have a query that searches through several tables and returns one row for every value in one specific column of one of the queried tables. The table returns multiple rows for one unique identifier. What I want to do is combine those rows that have the same unique identifier and combine 2 of the column's value separated by commas and return those values as a unique column. Example: Museum MuseumID Country City Paintings Sculptures Louvre 345 France Paris Mona Lisa NULL Louvre 345 France

问题 I have a query that searches through several tables and returns one row for every value in one specific column of one of the queried tables. The table returns multiple rows for one unique identifier. What I want to do is combine those rows that have the same unique identifier and combine 2 of the column's value separated by commas and return those values as a unique column. Example: Museum MuseumID Country City Paintings Sculptures Louvre 345 France Paris Mona Lisa NULL Louvre 345 France

问题 I am trying to find the number of coauthors who are common between certain authors - When the first name and the last name of the authors is the same and one of the authors has no middle name. In such scenarios, we are interested to find the number of coauthors who are common to the author with no middle name with the authors with middle names. For example, [link] http://www.sqlfiddle.com/#!9/75243/1 In this table, we have authors with multiple middle names but the same first and last names i

问题 I have this query (and results): select articles.article_id, articles.article_text, article_photos.photo_filename from articles left join article_photos on article_photos.article_id=articles.article_id >>> results 1,some_text,photo1.jpg 1,some_text,photo2.jpg 1,some_text,photo3.jpg How do I incorporate GROUP_CONCAT to this so that I get: >>> results 1,some_text,photo1.jpg NULL,NULL,photo2.jpg NULL,NULL,photo3.jpg Basically, I have a table with articles, and related table with images. An

问题 I have this query (and results): select articles.article_id, articles.article_text, article_photos.photo_filename from articles left join article_photos on article_photos.article_id=articles.article_id >>> results 1,some_text,photo1.jpg 1,some_text,photo2.jpg 1,some_text,photo3.jpg How do I incorporate GROUP_CONCAT to this so that I get: >>> results 1,some_text,photo1.jpg NULL,NULL,photo2.jpg NULL,NULL,photo3.jpg Basically, I have a table with articles, and related table with images. An

问题 Is there a limit on a value string in php Associative array? I have a query that returns value of GROUP_CONCAT as CSV for an array element. When I run the query directly, I see all values being returned. When I print the array in PHP, the string is truncated. Not sure how get around it? Any ideas? More info: I just var_dump the results I got from query. Here it is. It shows 1024. Looks like there is a limit. What is it? array(5) { ["FIELD_ID"]=> string(3) "232" ["answers"]=> string(1024) "48

问题 I don't think that I can use ORDER BY clause inside the GROUP_CONCAT function. Does anyone know a tricky way to accomplish this behavior in SQLite ? I saw this question before. But I have a complex query . My statement looks like this: SELECT c.col1, c.col3, m.col3, m.col4, count(m.col1), count(re.col2) AS cnt, GROUP_CONCAT(p.col1 ORDER BY p.col1) AS "Group1", GROUP_CONCAT(p.col2 ORDER BY p.col1) AS "Group2", GROUP_CONCAT(CASE WHEN con.col3 is null THEN p.col1 ELSE con.col3 END), con.col4,

问题 please I want to use group_concat in a query using eloquent and not raw queries. here is the code which i tried to execute and did't work for me: commands::join('products', 'products.id', '=','commands.idproduct') ->select('commands.username','**group_concat(products.name)**') ->group by ('commands. username') ->get(); Thanks in advance :) 回答1: I just used use DB; and in my query I used DB::raw('group_concat(products.name)') !! 回答2: This worked for me $list = TableName::where('user_id', 'user