subquery

问题 The following query is working absolutely fine for me: SELECT * From Customers WHERE Customers.ContactName = (SELECT FirstName FROM Employees as E, orders as O WHERE <condition> LIMIT 1); However, if i use LIKE instead of = to compare with the result of the subquery, I'm not getting any results. How do I use LIKE '%%' in the above query? 回答1: First, this query should not be working fine: SELECT * From Customers WHERE Customers.ContactName = (SELECT FirstName from Employees as E, orders as O

问题 The following query is working absolutely fine for me: SELECT * From Customers WHERE Customers.ContactName = (SELECT FirstName FROM Employees as E, orders as O WHERE <condition> LIMIT 1); However, if i use LIKE instead of = to compare with the result of the subquery, I'm not getting any results. How do I use LIKE '%%' in the above query? 回答1: First, this query should not be working fine: SELECT * From Customers WHERE Customers.ContactName = (SELECT FirstName from Employees as E, orders as O

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 Is it possible to set/read variables from within the query? pseudo code: SELECT animal_name, @tallest_animal = (select top 1 height from animal order by height desc) as tallest, @smallest_animal = (select top 1 height from animal order by height asc) as smallest FROM animals WHERE height BETWEEN @smallest_animal AND @tallest_animal I know the result can be achieved by making the query different, my question's real use is too difficult to explain. It's Microsoft SQL Server in question. :) 回答1:

问题 I have two tables. Table 1: +------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------+-------------+------+-----+---------+-------+ | ID | varchar(255)| NO | PRI | NULL | | | Sex | int(20) | YES | | NULL | | | Age | varchar(255)| YES | | NULL | | +------------+-------------+------+-----+---------+-------+ Table 2: +-----------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------

问题 I have data: query url score a www.google.com 3 a www.facebook.com 2 a www.google.com 1 I want to 'group' entries by their domain, and then order (desc) the domain groups by each group's highest score so I get: query url score a www.google.com 3 a www.google.com 1 a www.facebook.com 2 Trying: select * from table order by score desc, url asc doesnt work. It gives (no apparent change): query url score a www.google.com 3 a www.facebook.com 2 a www.google.com 1 回答1: You can use window functions -

问题 I am trying to create a sublist using Linq but don't understand the error in this. I don't think i am doing wrong but i think others eye will help me to sort this issue. var dataList = File.ReadAllLines(inputFile); dataList = from line in dataList let temp = from data in line.Split(';').ToList() where line.Split(';').ToList().IndexOf(data) != 0 ||line.Split(';').ToList().IndexOf(data) != 1 select data select string.Join(",",temp); I am getting error saying that IEnumerable list cannot be