BlogJava-NeedJava-随笔分类-SQL

〔SQL〕根据值查找表和字段（转载）

NeedJava — Thu, 23 Aug 2007 21:21:00 GMT

-- 我知道一个值“White”，想知道它在哪个表里的哪个字段

-- 使用Northwind测试
USE Northwind
GO

DECLARE @what varchar(800)
SET @what='White' --要搜索的字符串

DECLARE @sql varchar(8000)

DECLARE TableCursor CURSOR LOCAL FOR
SELECT sql='IF EXISTS ( SELECT 1 FROM ['+o.name+'] WHERE ['+c.name+'] LIKE ''%'+@what+'%'' ) PRINT ''所在的表及字段：['+o.name+'].['+c.name+']'''
FROM syscolumns c JOIN sysobjects o ON c.id=o.id
WHERE o.xtype='U' AND c.status>=0 AND c.xusertype IN (175, 239, 231, 167 )

OPEN TableCursor

FETCH NEXT FROM TableCursor INTO @sql
WHILE @@FETCH_STATUS=0
BEGIN
EXEC( @sql )
FETCH NEXT FROM TableCursor INTO @sql
END

CLOSE TableCursor

-- 删除游标引用
DEALLOCATE TableCursor

-- 测试结果
所在的表及字段：[Orders].[ShipName]
所在的表及字段：[Customers].[CompanyName]

NeedJava 2007-08-24 05:21 发表评论

〔SQL〕要查询Begin与End字段都相同的记录，出现次数在n次以上的结果集（改写）

NeedJava — Thu, 23 Aug 2007 21:20:00 GMT

要查询Begin与End字段都相同的记录，出现次数在n次以上的结果集

有一个数据库表，结构为：（3个字段）
Begin 从字符型
End 到字符型
Time 时间时间型

数据：
Begin End Time
111 222 2002-10-10
111 333 2002-10-11
111 444 2002-10-12
111 222 2002-10-13
111 222 2002-10-14
111 333 2002-10-15
222 111 2002-10-16
222 333 2002-10-17
222 555 2002-10-18
444 222 2002-10-19
444 222 2002-10-20
666 222 2002-10-21

要查询Begin与End字段都相同的记录，出现次数在n次以上的结果集

n=2结果集为：
Begin End Time
111 222 2002-10-10
111 333 2002-10-11
111 222 2002-10-13
111 222 2002-10-14
111 333 2002-10-15
444 222 2002-10-19
444 222 2002-10-20

n=3结果集为：
Begin End Time
111 222 2002-10-10
111 222 2002-10-13
111 222 2002-10-14

不知这种情况的SQL语句如何写？
---------------------------------------------------------------
USE Northwind
GO

IF EXISTS( SELECT * FROM dbo.sysobjects WHERE id=object_id( N'[Flight]' ) AND OBJECTPROPERTY( id, N'IsUserTable' )=1 )
DROP TABLE [Flight]
GO

CREATE TABLE [Flight]
(
[Begin] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL,
[End] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL,
[Time] [datetime] NULL
) ON [PRIMARY]
GO

INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '111', '222', '2002-10-10' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '111', '333', '2002-10-11' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '111', '444', '2002-10-12' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '111', '222', '2002-10-13' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '111', '222', '2002-10-14' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '111', '333', '2002-10-15' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '222', '111', '2002-10-16' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '222', '333', '2002-10-17' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '222', '555', '2002-10-18' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '444', '222', '2002-10-19' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '444', '222', '2002-10-20' )
INSERT INTO [Flight]( [Begin], [End], [Time] ) VALUES( '666', '222', '2002-10-21' )
GO

SELECT * FROM [Flight]
GO

-- 方法一

DECLARE @n int -- 出现次数
SET @n=2

SELECT *
FROM [Flight] T1
WHERE ( SELECT COUNT(*)
        FROM [Flight] T2
        WHERE T2.[Begin]=T1.[Begin] AND T2.[End]=T1.[End] )>=@n
ORDER BY T1.[Begin], T1.[End], T1.[Time]

-- 方法二

DECLARE @n int -- 出现次数
SET @n=2

SELECT *
FROM [Flight] T1
WHERE EXISTS ( SELECT 1
               FROM ( SELECT [Begin], [End]
                      FROM [Flight]
                      GROUP BY [Begin], [End]
                      HAVING COUNT(*)>=@n ) T2
               WHERE T2.[Begin]=T1.[Begin] AND T2.[End]=T1.[End] )
ORDER BY T1.[Begin], T1.[End], T1.[Time]

NeedJava 2007-08-24 05:20 发表评论

〔SQL〕MS SQL Server 2000 SP4 提取〖查询分析器〗

NeedJava — Mon, 02 Jul 2007 18:55:00 GMT

想在只有MSDE的机器上使用〖查询分析器〗或〖事件探查器〗？

分离以下文件出来即可放在U盘带走，打上SP4补丁先。

〖查询分析器〗包含以下组件：
[SQLQueryAnalyzer]
howtosql.chi
howtosql.chm
isqlw.exe
isqlw.rll
objmgr.dll
objmgr.rll
objmgr80.xml
pfclnt80.dll
pfclnt80.rll
pfutil80.dll*
pfutil80.rll*
semsfc.dll*
semsfc.rll*
sqlgui.dll*
sqlgui.rll*
sqlqry.dll
sqlqry.rll
sqlsvc.dll
sqlsvc.rll

〖事件探查器〗包含以下组件：
[SQLProfiler]
profiler.chi
profiler.chm
msvcr71.dll
pfutil80.dll*
pfutil80.rll*
profiler.exe
profiler.rll
semsfc.dll*
semsfc.rll*
sqlgui.dll*
sqlgui.rll*

其中，有星号的表示共有的；有括号的表示包括文件夹里的内容；另外，选择2052文件夹里的文件，那是中文的。

NeedJava 2007-07-03 02:55 发表评论