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?
I have the following query: SELECT AVG(time) FROM (SELECT UNIX_TIMESTAMP(max(datelast)) - UNIX_TIMESTAMP(min(datestart)) AS time
I\'m trying to string concatenate multiple row values from one table using \"Coalesce\", separated by comma and list it as a column in a subquery.
The title pretty much says it all.Under \"standard-compliant\" SQL I mean SQL constructs allowed in any of SQL 开发者_如何学Pythonstandards.
There\'s a strange behaviour that is drive me crazy. I\'ve a table of users and a table of permissions in an old SQL Server 2000 database.
I have a problem with the partitioning and subqueries (mysql 5.1). Exactly when I\'m executing select with subselect mysql skips partitioning. And I don\'t understand why. Exactl开发者_如何学Goy, I ha
I apologize in advance for the length, the solution may well be trivial, just wanted to be as informative as I could.
Given this table structure and example data (t3 should not be used in the query, it is only here to show the relation between t1 and t2):
In a MySql select statement involving aggregation, is it possible to select just the grouped by column without the aggregate?
I have an SQL script (currently running against SQLite, but it should probably work against any DB engine) that uses the same subquery twice, and since it might be fetching a lot of records (the table
加载中,请稍侯......