greatest-n-per-group
Group by - Overriding default behaviour of deciding row under each group in result
Extending further from this question Query to find top rated article in each category - Consider the same table -[详细]
2023-01-27 11:08 分类:问答SQL command for finding the second highest salary
HI, Can u tell me the syntax of the SQL command which gives as output the second highest salary from a range of salaries stored in the employee table.[详细]
2023-01-27 02:18 分类:问答What SQL query returns the row with the most recent Date and Time (Column B and C) for each unique Column A?
What SQL query returns the row wi开发者_如何转开发th the most recent Date and Time (Column B and C) for each unique Column A?If C is actually a datetime column with date and time information set, you[详细]
2023-01-26 13:25 分类:问答How to optimize complex query?
I am developing a marketing-type system.On the front page, one of the requirements is for sales staff to see the number of sales opportunities they currently have.[详细]
2023-01-26 07:44 分类:问答Sql query to pull top 3 records with max votes in each category
Need some help with putting this query together. I\'m using Mysql I have two tables Video - contains videos uploaded by users[详细]
2023-01-25 19:47 分类:问答Optimal way to join three tables in SQLite
A (simplified) database of Internet bookmarks. I thought it\'d make sense to organize the tables logically, like so:[详细]
2023-01-24 04:40 分类:问答MySQL - Max() return wrong result
I tried this query on MySQL server (5.1.41)... SELECT max(volume), dateofclose, symbol, volume, close, market FROM daily group by market[详细]
2023-01-23 22:35 分类:问答Getting top row for each unique group in the inner joined group query
table 1 idnameclass 1abA 2cdA 3efB 4abB 5cdB table 2 nametestmarks ab190 ab270 cd280 cd385 ef385 ef460 Hi, I have 2 t开发者_JS百科ables above, my question is what is the most efficient/best or[详细]
2023-01-23 22:28 分类:问答How to use selects in join clauses in Android 2.1?
I have a query that does some magical sort-group-joining that works just fine on Android 2.2 (froyo) version of SQLite:[详细]
2023-01-23 09:46 分类:问答Replace mysql->php->mysql with nested query
I have a table with columns \'customer\' and \'location\' and I need to check top 10 locations visited by unique customers.[详细]
2023-01-22 05:12 分类:问答