SQL Server 요약 복습(2)
--
SELECT * FROM dbo.student AS a INNER JOIN dbo.ScoreTB AS b ON a.Id = b.stuid
WHERE scorename = ' '
-------------------------------------------
--ROW_NUMBER() 1
-------------------------------------------
SELECT ROW_NUMBER() OVER (ORDER BY B.SCORE DESC) AS ROWNUMBER ,A.NAME, B.SCORE, a.Id
FROM dbo.student AS a INNER JOIN dbo.ScoreTB AS b ON a.Id = b.stuid
WHERE scorename = ' '
-- order by， （ ）
SELECT ROW_NUMBER() OVER (ORDER BY B.SCORE DESC) AS ROWNUMBER ,A.NAME, B.SCORE, a.Id
FROM dbo.student AS a INNER JOIN dbo.ScoreTB AS b ON a.Id = b.stuid
WHERE scorename = ' ' ORDER BY a.Id
-- ， ， cte ， row_number
WITH b AS
(
SELECT stuid, SUM(score) AS score FROM ScoreTB GROUP BY stuid
)
SELECT * ,ROW_NUMBER() OVER (ORDER BY b.score desc) AS rownumer
FROM dbo.student AS a INNER JOIN b ON a.id = b.stuid
----------------------------------------------------------------------------
--RANK() ROW_NUMER ， order by ， ，
-- ， 1， 4，
----------------------------------------------------------------------------
----------------------------------------------------------------------------
--DENSE_RANK() ROW_NUMER、RANK ， ， rank
-- ， 1， 2，
----------------------------------------------------------------------------
----------------------------------------------------------------------------
--ntile 。 ， 。
-- （ 1 ）。 “ ”。
-- ， ，
----------------------------------------------------------------------------
SELECT ntile(2) OVER (ORDER BY B.SCORE DESC) AS GROUPID ,A.NAME, ISNULL(B.SCORE,0) SCORE, a.Id
FROM dbo.student AS a LEFT JOIN dbo.ScoreTB AS b ON a.Id = b.stuid AND scorename = ' '
--------------------------------------------------------------------------
--PARTITION BY group by，
--------------------------------------------------------------------------
-- ：
SELECT RANK() OVER (PARTITION BY b.scorename ORDER BY B.SCORE DESC) AS ROWNUMBER,b.scorename,
b.score, A.NAME, a.Id FROM dbo.student AS a INNER JOIN dbo.ScoreTB AS b ON a.Id = b.stuid ORDER BY SCORENAME
DECLARE @num INT = 101
SELECT TOP (@num) * FROM Student ORDER BY Id --
SELECT TOP (@num) percent * FROM Student ORDER BY Id -- float 1-100 ，
View Code
--
CREATE TABLE [dbo].[Student](
[Id] [int] NULL,
[Name] [varchar](50) NULL
)
go
INSERT INTO dbo.Student VALUES (1, ' ')
INSERT INTO dbo.Student VALUES (2, ' ')
INSERT INTO dbo.Student VALUES (3, ' ')
INSERT INTO dbo.Student VALUES (4, ' ')
go
CREATE TABLE [dbo].[scoretb](
[stuId] [int] NULL,
[scorename] [varchar](50) NULL,
[score] INT NULL
)
go
INSERT INTO [scoretb] VALUES (1,' ',22)
INSERT INTO [scoretb] VALUES (1,' ',32)
INSERT INTO [scoretb] VALUES (1,' ',42)
INSERT INTO [scoretb] VALUES (2,' ',52)
INSERT INTO [scoretb] VALUES (2,' ',62)
INSERT INTO [scoretb] VALUES (2,' ',72)
INSERT INTO [scoretb] VALUES (3,' ',82)
INSERT INTO [scoretb] VALUES (3,' ',92)
INSERT INTO [scoretb] VALUES (3,' ',72)
--
CREATE FUNCTION [dbo].[fGetScore](@stuid int)
RETURNS @score TABLE
(
[stuId] [int] NULL,
[scorename] [varchar](50) NULL,
[score] INT NULL
)
as
BEGIN
INSERT INTO @score
SELECT stuid,scorename,score FROM dbo.scoretb WHERE stuId = @stuid
RETURN;
END
GO
--
SELECT A.id,A.name,B.scorename,B.score FROM [Student] A
CROSS APPLY [dbo].[fGetScore](A.Id) B -- inner join
SELECT A.id,A.name,B.scorename,B.score FROM [Student] A
OUTER APPLY [dbo].[fGetScore](A.Id) B -- left join
--
--SELECT A.id,A.name,B.scorename,B.score FROM [Student] A
-- INNER JOIN [dbo].[fGetScore](A.Id) B ON A.Id = B.stuid
-- SELECT A.id,A.name,B.scorename,B.score FROM [Student] A
-- INNER JOIN (SELECT * FROM [dbo].[fGetScore](A.Id)) B ON A.Id = B.stuid
DECLARE BillMsgCursor CURSOR FOR
SELECT TypeNo,TabDetailName FROM dbo.BillType
OPEN BillMsgCursor
DECLARE @TypeNo CHAR(5)
DECLARE @DetailName VARCHAR(50)
FETCH NEXT FROM BillMsgCursor INTO @TypeNo,@DetailName
WHILE @@FETCH_STATUS = 0
BEGIN
DECLARE @DataFieldName VARCHAR(50)
DECLARE ColumnName CURSOR FOR
SELECT name FROM syscolumns WHERE id = OBJECT_ID(@DetailName)
OPEN ColumnName
FETCH NEXT FROM ColumnName INTO @DataFieldName
PRINT ' :' + @TypeNo
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'ListDetailDataFiled.Add('''+@DataFieldName+''');'
FETCH NEXT FROM ColumnName INTO @DataFieldName
END
CLOSE ColumnName
DEALLOCATE ColumnName
FETCH NEXT FROM BillMsgCursor INTO @TypeNo,@DetailName
END
CLOSE BillMsgCursor
DEALLOCATE BillMsgCursor
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