SELECT DISTINCT t.town, ( SELECT SQL_CACHE DISTINCT GROUP_CONCAT( p1.postcode SEPARATOR ', ' ) FROM coverage_postcodes AS p1 WHERE p1.id = tp.postcode_id ) AS 'postcode', ( SELECT SQL_CACHE DISTINCT GROUP_CONCAT( b1.borough SEPARATOR ', ' ) FROM coverage_boroughs AS b1 WHERE b1....
In the query below, I can select the 'path' to a product, but not the product name SELECT GROUP_CONCAT(parent.name SEPARATOR '/') AS my_path FROM categories AS node, categories AS parent WHERE node.left_node BETWEEN parent.left_node AND parent.right_node AND node.name ...
GROUP_CONCAT(purchase.date, ',', sales.date) AS date
The default maximum length of the result is 1024, but you can set the value higher by running this command: SET [GLOBAL | SESSION] group_concat_max_len = val; Need a good GUI Tool for MySQL? TablePlus is a modern, native tool with an elegant UI that allows you to simultaneously manag...
In MySQL, there is a function, GROUP_CONCAT(), which allows you to concatenate the values from multiple rows. Example: SELECT 1 AS a, GROUP_CONCAT(name ORDER BY name ASC SEPARATOR ', ') AS people FROM users WHERE id IN (1,2,3) GROUP BY a Works basically. Two things to conside...
If this column is short, reasonably unique, and indexed, it might be faster than a “wide” index on many columns. In MySQL, it is very easy to use this extra column: SELECT * FROM tbl_name WHERE hash_col=MD5(CONCAT(val1,val2)) AND col1=val1 AND col2=val2;...
Loose Index Scan can also be used in the absence ofGROUP BYunder some conditions. SeeSkip Scan Range Access Method. The most efficient way to processGROUP BYis when an index is used to directly retrieve the grouping columns. With this access method, MySQL uses the property of some index ty...
group_concat in SQL Server 2012 with ORDER BY another column Grouping by first four characters Grouping Records into buckets of 15 minutes ... GUIA - Como buscar una columna en todas las tablas / GUIDE - How to search a column in all tables Handle Date Time with Null Values Handling Datet...
Another way of doing this is by generating the select query. Play with this fiddle....
I have view that coverts above table to horizontal form using group_concat function Converting above data in horizontal form :- 1, (A,B) 2, (A,B,A) 3, (A) 4, (A,B,C,D) 5, (A,A,Z) 6, (B,A) Is it better to store data in table with 2 columns Key_id and attr (json...