Sql 选择具有最高ID和指定列值的行
我对sql查询有问题。我有下表:Sql 选择具有最高ID和指定列值的行,sql,sql-server,Sql,Sql Server,我对sql查询有问题。我有下表: ╔════╦═══════════════╦═════════════╦══════════╗ ║ ID ║ NAME ║ CITY ║ PCNUMBER ║ ╠════╬═══════════════╬═════════════╬══════════╣ ║ 1 ║ John Doe ║ New York ║ 42 ║ ║ 2 ║ John Doe ║ New York ║
╔════╦═══════════════╦═════════════╦══════════╗
║ ID ║ NAME ║ CITY ║ PCNUMBER ║
╠════╬═══════════════╬═════════════╬══════════╣
║ 1 ║ John Doe ║ New York ║ 42 ║
║ 2 ║ John Doe ║ New York ║ 42 ║
║ 3 ║ John Doe ║ New York ║ 42 ║
║ 4 ║ John Doe ║ Los Angeles ║ 42 ║
║ 5 ║ Ellen Ripley ║ Nostromo ║ 2092 ║
║ 6 ║ James T. Kirk ║ Riverside ║ 2233 ║
║ 7 ║ Henry Jones ║ Chicago ║ 1899 ║
╚════╩═══════════════╩═════════════╩══════════╝
现在,我想获取具有指定PCNUMBER(可以大于1)的行,但它只能为每个唯一PCNUMBER返回1个结果
假设我要的是PCNUMBER 42和2092的数据。结果将是:
╔════╦══════════════╦═════════════╦══════════╗
║ ID ║ NAME ║ CITY ║ PCNUMBER ║
╠════╬══════════════╬═════════════╬══════════╣
║ 4 ║ John Doe ║ Los Angeles ║ 42 ║
║ 5 ║ Ellen Ripley ║ Nostromo ║ 2092 ║
╚════╩══════════════╩═════════════╩══════════╝
我尝试了很多东西,但我似乎无法做到这一点:(希望你们能帮助我
很抱歉,如果有人已经有了类似的问题,但我找不到。SQL Server支持
公共表表达式和窗口函数
WITH records
AS
(
SELECT ID, Name, City, PCNUMBER,
ROW_NUMBER() OVER(PARTITION BY PCNUMBER ORDER BY ID DESC) rn
FROM TableName
)
SELECT ID, Name, City, PCNUMBER
FROM records
WHERE rn = 1 AND
PCNUMBER IN (42, 2092)
输出
╔════╦══════════════╦═════════════╦══════════╗
║ ID ║ NAME ║ CITY ║ PCNUMBER ║
╠════╬══════════════╬═════════════╬══════════╣
║ 4 ║ John Doe ║ Los Angeles ║ 42 ║
║ 5 ║ Ellen Ripley ║ Nostromo ║ 2092 ║
╚════╩══════════════╩═════════════╩══════════╝
单向
select T.* from T
inner join (
select
max(id) id
from T
where PCNUMBER in (42, 2092)
group by PCNUMBER
) mx on mx.id = T.id
你将如何决定使用哪个城市的价值,即John Doe拥有纽约和洛杉矶。洛杉矶,因为它拥有最高的ID,我认为title@tomasmcguinness字体在标题中:“ID最高”非常感谢。这正是我想要的。