Sql server 如何使用T-SQL确定SQL Server列中的数据分布
有人能告诉我如何用T-SQL编译代码，让我可以查看数据在列中的分布情况吗 例如，在示例表中，有一列名为Sql server 如何使用T-SQL确定SQL Server列中的数据分布,sql-server,tsql,Sql Server,Tsql,有人能告诉我如何用T-SQL编译代码，让我可以查看数据在列中的分布情况吗 例如，在示例表中，有一列名为model。在该列中，50%的值是节日。我想创建一个查询，帮助确定列中数据的分布 我提供了一些示例代码来帮助您： CREATE TABLE #tmpTable ( registration varchar(50), make varchar(50), model varchar(50), engine_size float ) INSERT I
modelCREATE TABLE #tmpTable
(
registration varchar(50),
make varchar(50),
model varchar(50),
engine_size float
)
INSERT INTO #tmpTable VALUES
('JjFw5a0','SKODA','OCTAVIA',1.8),
('VkfCDpZ','FORD','FIESTA',1.7),
('5E93ZEq','SKODA','OCTAVIA',1.3),
('L2PPN0m','FORD','FIESTA',1.1),
('9xKghxp','FORD','FIESTA',1.5),
('WHShdBm','FORD','FIESTA',1.4),
('TNRHyy7','NISSAN','QASHQAI',1.2),
('6RNX0XG','SKODA','OCTAVIA',1.4),
('tJ9bOD8','FORD','FIESTA',1.1),
('ablFUSC','FORD','FIESTA',1),
('4B7RLYL','MERCEDED_BENZ','E CLASS',1.3),
('tlJiwVY','FORD','FIESTA',1),
('Fb9lcvG','FORD','FIESTA',1.4),
('nW4lqBC','FORD','FIESTA',1.6),
('LggTmL5','HYUNDAI','I20',1),
('2mGgSjS','FORD','FIESTA',1.1),
('IDvOzcM','FORD','FIESTA',1.3),
('JefpXK2','FORD','FIESTA',1.5),
('0h1uWfZ','MERCEDED_BENZ','E CLASS',1.4),
('ylBoGbV','MERCEDED_BENZ','E CLASS',1.7),
('XzoILDK','VAUXHALL','CORSA',1.8),
('Xhocs1Z','FORD','FIESTA',1.5),
('Lh2yWGa','KIA','RIO',1.5),
('hM5GWA0','FORD','FIESTA',1.3),
('PbpxkFt','FORD','FIESTA',1.7),
('SDHWV2r','FORD','FIESTA',1.2),
('n83Je2D','FORD','FIESTA',1.8),
('sDN0gex','FORD','FIESTA',1.2),
('7EICOZY','KIA','RIO',1.5),
('PUuMmIH','FORD','FIESTA',1),
('HiBwSg2','FORD','FIESTA',1.8),
('1yk1vDm','KIA','RIO',1.7),
('cMpH72R','HYUNDAI','I20',1.1),
('ZgQL0gt','MERCEDED_BENZ','E CLASS',1.3),
('jhpamQG','KIA','RIO',1.1),
('pk0lU2F','VAUXHALL','CORSA',1.4),
('fDCUeq1','FORD','FIESTA',1.1),
('ono5QFC','FORD','FIESTA',1.7),
('VohWwGR','FORD','FIESTA',1.5),
('Hih8dKc','SUZUKI','SWIFT',1.2),
('D2RNn3h','SUZUKI','SWIFT',1.2),
('QaYQulE','FORD','FIESTA',1.1),
('xmQPxAG','FORD','FIESTA',1.8),
('vmTqkTO','FORD','FIESTA',1.2),
('lvUtVUA','MERCEDED_BENZ','E CLASS',1),
('SFoj00d','FORD','FIESTA',1),
('9S6wrWV','MERCEDED_BENZ','E CLASS',1),
('0SBnW0z','FORD','FIESTA',1.1),
('HnDHdfj','MERCEDED_BENZ','E CLASS',1),
('RV7q947','FORD','FIESTA',1.4),
('JZqCtTg','FORD','FIESTA',1.7),
('XVgBwgi','FORD','FIESTA',1.8),
('iqJDsIF','FORD','FIESTA',1.6),
('CMbpRFa','FORD','FIESTA',1.6),
('vF7K5Xg','SUZUKI','SWIFT',1.1),
('3j6XGDH','FORD','FIESTA',1.5),
('ommqugM','FORD','FIESTA',1.1),
('LMQkPnw','NISSAN','QASHQAI',1.4),
('1dKgcdd','FORD','FIESTA',1.5),
('hC8BxiP','MERCEDED_BENZ','E CLASS',1.1),
('wLTWol7','FORD','FIESTA',1.6),
('TY8ChYN','FORD','FIESTA',1.6),
('Gw1CpI8','FORD','FIESTA',1.4),
('L4OPAJq','FORD','FIESTA',1.1),
('6TyYpfi','NISSAN','QASHQAI',1.6),
('ozoOcGL','FORD','FIESTA',1.4),
('6IME19U','FORD','FIESTA',1.4),
('BxpmJO5','FORD','FIESTA',1.4),
('0zc2n5A','FORD','FIESTA',1.3),
('FqbBZE2','FIAT','500',1.7),
('2EkTOTz','FORD','FIESTA',1.4),
('fNBvIvg','MERCEDED_BENZ','E CLASS',1.2),
('u5j4R4S','KIA','RIO',1.4),
('zpWaUZo','FORD','FIESTA',1.1),
('FQPVQYc','NISSAN','QASHQAI',1.7),
('8RBQADq','KIA','RIO',1.7),
('TOz2bcT','HYUNDAI','I20',1.7),
('jebhCex','FORD','FIESTA',1.3),
('cdHA1gL','FORD','FIESTA',1.2),
('FoaN4AT','FORD','FIESTA',1.7),
('atGn288','FORD','FIESTA',1.5),
('es8VNdW','FIAT','500',1.3),
('hDWoMXa','KIA','RIO',1.4),
('Q9C6Br1','KIA','RIO',1.5),
('mFSy4aF','FORD','FIESTA',1.6),
('bbbKnrM','SKODA','OCTAVIA',1.5),
('qY7lz6I','FORD','FIESTA',1),
('8Ch2OeU','VAUXHALL','CORSA',1.3),
('dcWsjJv','VAUXHALL','CORSA',1.3),
('bnnoBPg','SKODA','OCTAVIA',1.8),
('mvDyYkK','FORD','FIESTA',1.4),
('KpWDYap','FORD','FIESTA',1.3),
('7EK9K4z','FORD','FIESTA',1.3),
('ZPLHtlP','FORD','FIESTA',1.6),
('4EpYeSB','FORD','FIESTA',1.6),
('O1eZ20M','FORD','FIESTA',1),
('WfVntKk','FORD','FIESTA',1.7),
('6VlkBdi','FORD','FIESTA',1.1),
('hFQfKjk','KIA','RIO',1.4),
('3Y4njNP','KIA','RIO',1),
('3UuNqG0','FORD','FIESTA',1.7),
('qpvMYAu','FORD','FIESTA',1.1),
('NCYJUqx','FORD','FIESTA',1.3),
('M0AvWzg','FORD','FIESTA',1.6),
('XbVmtFf','FORD','FIESTA',1.3),
('l8qZy0H','SKODA','OCTAVIA',1.3),
('EDUbxaU','MERCEDED_BENZ','E CLASS',1.6),
('nWLd82o','FORD','FIESTA',1.7),
('4AkoyWx','FORD','FIESTA',1),
('nOoO25v','FORD','FIESTA',1.3),
('VAm5aV8','NISSAN','QASHQAI',1.4),
('zbd3cie','FORD','FIESTA',1.5),
('hyAN71W','NISSAN','QASHQAI',1),
('FxACHDf','FIAT','500',1.7),
('wOZdaeV','FORD','FIESTA',1.6),
('gfxZl99','VAUXHALL','CORSA',1.1),
('06HhwEJ','SKODA','OCTAVIA',1.7),
('PCTgYiG','KIA','RIO',1.7),
('U54WXZQ','KIA','RIO',1.6),
('FHgrRiF','FORD','FIESTA',1.6),
('R3jP73p','SKODA','OCTAVIA',1.5),
('etVPKX9','SUZUKI','SWIFT',1.1),
('BE3yReB','FORD','FIESTA',1.7),
('zXmX878','FORD','FIESTA',1.6),
('wdM3P2m','FORD','FIESTA',1.7),
('tb727BM','FORD','FIESTA',1.1)
SELECT * FROM #tmpTable
您可以使用条件聚合来获取福特嘉年华的计数与总计数的比率
SELECT 100.0
* count(CASE
WHEN make = 'FORD'
AND model = 'FIESTA' THEN
1
END)
/ count(*)
FROM #tmptable;
编辑： 如果您想要所有车型的数字，您可以简单地聚合和分组以获得每个车型的计数，并将其除以可通过子查询获得的总计数
SELECT make,
model,
100.0
* count(*)
/ (SELECT count(*)
FROM #tmptable)
FROM #tmptable
GROUP BY make,
model;
SELECT make
, model
, count(*) as cnt -- count per Model
, cast(count(*) * 100.0 -- compared to all counts
/ sum(count(*))
over () as dec(5,2)) as distribution
FROM #tmptable
group by make
, model
order by distribution desc;
SELECT make
, model
, count(*) as cnt -- count per Model
, cast(count(*) * 100.0
/ sum(count(*)) -- compared to all counts per Make
over (partition by Make) as dec(5,2)) as distribution
FROM #tmptable
group by make
, model
order by make, distribution desc;
请显示预期结果以及您的尝试query@Squirrel，我的尝试结果如下：
SELECT table1.registration，table1.make，table1.model，table1.engine\u size，NTILE（20）OVER（按table1.registration排序）作为dbo.table1中的partbyme订购partbyme说明模型