greatest-n-per-group
Mysql ORDER BY RAND() LIMIT 1 problem
The problem is the bellow query. SELECT RSV.Value FROM tblsubmitedservice SS LEFT JOIN (SELECT ServiceID, Value[详细]
2023-03-07 16:24 分类:问答select specific tranactions for a member
I want to be able to select for a member their first transaction for each day and only for the first 3 days and them place an \"order\" against each as shown in exam开发者_Go百科ple?[详细]
2023-03-04 18:09 分类:问答Using MySQL to SELECT the MAX of a SUM of the last 5 entries?
Hey, I\'m not the biggest expert with MySQL but here is what I have so far to get the MAX entery SELECT DISTINCT[详细]
2023-03-03 20:39 分类:问答A query to pick out the highest ten values, or the highest 10%, from groups within a table
I have a database of a large number of users, logging where they live and how many times they have logged into the site. I\'m looking to find out the most active users in each city.[详细]
2023-02-25 09:41 分类:问答ten cheapest room for each city
I have 3 table Room, Hotel, City, how can i select ten cheapest roomand its hotel_id for each city possible to execute the subquery for each city?[详细]
2023-02-24 04:16 分类:问答Order result form Mysql group by
Ok i got this table +-----+-----------------------------+-------------+-------------+----------+---------+[详细]
2023-02-21 23:20 分类:问答Make random groups of students from database based on grades
I have table with 30 students with grades from 1 to 5. How to make 6 different students group which contains five randomly selected students? Each group must have five students and each of those five[详细]
2023-02-21 08:30 分类:问答how to sort order of LEFT JOIN in SQL query?
OK I tried googling for an answer like crazy, but I couldn\'t resolve this, so I hope someone will be able to help.[详细]
2023-02-18 12:55 分类:问答Join first valid row from another table in innodb
I have 2 tables, one that holds records with some data related to it and another that holds historic data for first table.开发者_运维技巧[详细]
2023-02-17 16:03 分类:问答How do I join 4 tables on mysql select statement?
I have 4 tables in MySQL to join. Example $select = $db->query(\"SELECT * FROM ads WHERE ad_pic=\'1\'[详细]
2023-02-15 05:06 分类:问答