解决办法:
ljdbc url加上 zeroDateTimeBehavior参数Q?
datasource.url=jdbc:mysql://localhost:3306/testdb?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true
zeroDateTimeBehavior=round是ؓ了指定MySql中的DateTime字段默认值查询时的处理方式；默认是抛出异常，
对于gؓ0000-00-00 00:00:00Q默认|的纪录，如下两种配置Q会q回不同的结果：
zeroDateTimeBehavior=round 0001-01-01 00:00:00.0
zeroDateTimeBehavior=convertToNull null
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1、说明：创徏数据?br>CREATE DATABASE database-name
2、说明：删除数据?br>drop database dbname
3、说明：备䆾sql server
--- 创徏 备䆾数据?device
USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c:\mssql7backup\MyNwind_1.dat'
--- 开?备䆾
BACKUP DATABASE pubs TO testBack
4、说明：创徏新表
create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],..)
Ҏ已有的表创徏新表Q?
AQcreate table tab_new like tab_old (使用旧表创徏新表)
BQcreate table tab_new as select col1,col2... from tab_old definition only
5、说明：删除新表
drop table tabname
6、说明：增加一个列
Alter table tabname add column col type
注：列增加后不能删除。DB2中列加上后数据类型也不能改变Q唯一能改变的是增加varcharcd的长度?br>7、说明：d主键Q?Alter table tabname add primary key(col)
说明Q删除主键： Alter table tabname drop primary key(col)
8、说明：创徏索引Qcreate [unique] index idxname on tabname(col....)
删除索引Qdrop index idxname
注：索引是不可更改的Q想更改必须删除重新建?br>9、说明：创徏视图Qcreate view viewname as select statement
删除视图Qdrop view viewname
10、说明：几个单的基本的sql语句
选择Qselect * from table1 where 范围
插入Qinsert into table1(field1,field2) values(value1,value2)
删除Qdelete from table1 where 范围
更新Qupdate table1 set field1=value1 where 范围
查找Qselect * from table1 where field1 like '%value1%' ---like的语法很_֦Q查资料!
排序Qselect * from table1 order by field1,field2 [desc]
LQselect count as totalcount from table1
求和Qselect sum(field1) as sumvalue from table1
q_Qselect avg(field1) as avgvalue from table1
最大：select max(field1) as maxvalue from table1
最：select min(field1) as minvalue from table1
11、说明：几个高查询q算?br>AQ?UNION q算W?
UNION q算W通过l合其他两个l果表（例如 TABLE1 ?TABLE2Qƈ消去表中M重复行而派生出一个结果表。当 ALL ?UNION 一起用时Q即 UNION ALLQ，不消除重复行。两U情况下Q派生表的每一行不是来?TABLE1 是来自 TABLE2?
BQ?EXCEPT q算W?
EXCEPT q算W通过包括所有在 TABLE1 中但不在 TABLE2 中的行ƈ消除所有重复行而派生出一个结果表。当 ALL ?EXCEPT 一起用时 (EXCEPT ALL)Q不消除重复行?
CQ?INTERSECT q算W?br>INTERSECT q算W通过只包?TABLE1 ?TABLE2 中都有的行ƈ消除所有重复行而派生出一个结果表。当 ALL ?INTERSECT 一起用时 (INTERSECT ALL)Q不消除重复行?
注：使用q算词的几个查询l果行必L一致的?
12、说明：使用外连?
A、left outer joinQ?
左外q接Q左q接Q：l果集几包括q接表的匚w行，也包括左q接表的所有行?
SQL: select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c
BQright outer join:
叛_q接(双?Q结果集既包括连接表的匹配连接行Q也包括双接表的所有行?
CQfull outer joinQ?
全外q接Q不仅包括符可接表的匹配行Q还包括两个q接表中的所有记录?br>二、提?br>1、说明：复制?只复制结?源表名：a 新表名：b) (Access可用)
法一Qselect * into b from a where 1<>1
法二Qselect top 0 * into b from a
2、说明：拯?拯数据,源表名：a 目标表名Qb) (Access可用)
insert into b(a, b, c) select d,e,f from b;
3、说明：跨数据库之间表的拯(具体数据使用l对路径) (Access可用)
insert into b(a, b, c) select d,e,f from b in '具体数据? where 条g
例子Q?.from b in '"&Server.MapPath(".")&"\data.mdb" &"' where..
4、说明：子查?表名1Qa 表名2Qb)
select a,b,c from a where a IN (select d from b ) 或? select a,b,c from a where a IN (1,2,3)
5、说明：昄文章、提交h和最后回复时?br>select a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b
6、说明：外连接查?表名1Qa 表名2Qb)
select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c
7、说明：在线视图查询(表名1Qa )
select * from (SELECT a,b,c FROM a) T where t.a > 1;
8、说明：between的用?between限制查询数据范围时包括了边界?not between不包?br>select * from table1 where time between time1 and time2
select a,b,c, from table1 where a not between 数? and 数?
9、说明：in 的用方?br>select * from table1 where a [not] in ('?','?','?','?')
10、说明：两张兌表，删除主表中已l在副表中没有的信息
delete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 )
11、说明：四表联查问题Q?br>select * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where .....
12、说明：日程安排提前五分钟提?
SQL: select * from 日程安排 where datediff('minute',f开始时?getdate())>5
13、说明：一条sql 语句搞定数据库分?br>select top 10 b.* from (select top 20 主键字段,排序字段 from 表名 order by 排序字段 desc) a,表名 b where b.主键字段 = a.主键字段 order by a.排序字段
14、说明：?0条记?br>select top 10 * form table1 where 范围
15、说明：选择在每一lb值相同的数据中对应的a最大的记录的所有信?cMq样的用法可以用于论坛每月排行榜,每月热销产品分析,按科目成l排?{等.)
select a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)
16、说明：包括所有在 TableA 中但不在 TableB和TableC 中的行ƈ消除所有重复行而派生出一个结果表
(select a from tableA ) except (select a from tableB) except (select a from tableC)
17、说明：随机取出10条数?br>select top 10 * from tablename order by newid()
18、说明：随机选择记录
select newid()
19、说明：删除重复记录
Delete from tablename where id not in (select max(id) from tablename group by col1,col2,...)
20、说明：列出数据库里所有的表名
select name from sysobjects where type='U'
21、说明：列出表里的所有的
select name from syscolumns where id=object_id('TableName')
22、说明：列示type、vender、pcs字段Q以type字段排列Qcase可以方便地实现多重选择Q类似select 中的case?br>select type,sum(case vender when 'A' then pcs else 0 end),sum(case vender when 'C' then pcs else 0 end),sum(case vender when 'B' then pcs else 0 end) FROM tablename group by type
昄l果Q?br>type vender pcs
电脑 A 1
电脑 A 1
光盘 B 2
光盘 A 2
手机 B 3
手机 C 3
23、说明：初始化表table1
TRUNCATE TABLE table1
24、说明：选择?0?5的记?br>select top 5 * from (select top 15 * from table order by id asc) table_别名 order by id desc
三、技?br>1?=1Q?=2的用，在SQL语句l合时用的较?br>"where 1=1" 是表C选择全部 "where 1=2"全部不选，
如：
if @strWhere !=''
begin
set @strSQL = 'select count(*) as Total from [' + @tblName + '] where ' + @strWhere
end
else
begin
set @strSQL = 'select count(*) as Total from [' + @tblName + ']'
end
我们可以直接写成
set @strSQL = 'select count(*) as Total from [' + @tblName + '] where 1=1 安定 '+ @strWhere
2、收~数据库
--重徏索引
DBCC REINDEX
DBCC INDEXDEFRAG
--收羃数据和日?br>DBCC SHRINKDB
DBCC SHRINKFILE
3、压~数据库
dbcc shrinkdatabase(dbname)
4、{UL据库l新用户以已存在用户权限
exec sp_change_users_login 'update_one','newname','oldname'
go
5、检查备份集
RESTORE VERIFYONLY from disk='E:\dvbbs.bak'
6、修复数据库
ALTER DATABASE [dvbbs] SET SINGLE_USER
GO
DBCC CHECKDB('dvbbs',repair_allow_data_loss) WITH TABLOCK
GO
ALTER DATABASE [dvbbs] SET MULTI_USER
GO
7、日志清?br>SET NOCOUNT ON
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE tablename -- 要操作的数据库名
SELECT @LogicalFileName = 'tablename_log', -- 日志文g?br>@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 1 -- 你想讑֮的日志文件的大小(M)
-- Setup / initialize
DECLARE @OriginalSize int
SELECT @OriginalSize = size
FROM sysfiles
WHERE name = @LogicalFileName
SELECT 'Original Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' +
CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
CREATE TABLE DummyTrans
(DummyColumn char (8000) not null)
DECLARE @Counter INT,
@StartTime DATETIME,
@TruncLog VARCHAR(255)
SELECT @StartTime = GETDATE(),
@TruncLog = 'BACKUP LOG ' + db_name() + ' WITH TRUNCATE_ONLY'
DBCC SHRINKFILE (@LogicalFileName, @NewSize)
EXEC (@TruncLog)
-- Wrap the log if necessary.
WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE()) -- time has not expired
AND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName)
AND (@OriginalSize * 8 /1024) > @NewSize
BEGIN -- Outer loop.
SELECT @Counter = 0
WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000))
BEGIN -- update
INSERT DummyTrans VALUES ('Fill Log')
DELETE DummyTrans
SELECT @Counter = @Counter + 1
END
EXEC (@TruncLog)
END
SELECT 'Final Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR(30),size) + ' 8K pages or ' +
CONVERT(VARCHAR(30),(size*8/1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
DROP TABLE DummyTrans
SET NOCOUNT OFF
8、说明：更改某个?br>exec sp_changeobjectowner 'tablename','dbo'
9、存储更改全部表
CREATE PROCEDURE dbo.User_ChangeObjectOwnerBatch
@OldOwner as NVARCHAR(128),
@NewOwner as NVARCHAR(128)
AS
DECLARE @Name as NVARCHAR(128)
DECLARE @Owner as NVARCHAR(128)
DECLARE @OwnerName as NVARCHAR(128)
DECLARE curObject CURSOR FOR
select 'Name' = name,
'Owner' = user_name(uid)
from sysobjects
where user_name(uid)=@OldOwner
order by name
OPEN curObject
FETCH NEXT FROM curObject INTO @Name, @Owner
WHILE(@@FETCH_STATUS=0)
BEGIN
if @Owner=@OldOwner
begin
set @OwnerName = @OldOwner + '.' + rtrim(@Name)
exec sp_changeobjectowner @OwnerName, @NewOwner
end
-- select @name,@NewOwner,@OldOwner
FETCH NEXT FROM curObject INTO @Name, @Owner
END
close curObject
deallocate curObject
GO
10、SQL SERVER中直接@环写入数?br>declare @i int
set @i=1
while @i<30
begin
insert into test (userid) values(@i)
set @i=@i+1
end
记存储q程中经常用到的本周Q本月，本年函数
Dateadd(wk,datediff(wk,0,getdate()),-1)
Dateadd(wk,datediff(wk,0,getdate()),6)
Dateadd(mm,datediff(mm,0,getdate()),0)
Dateadd(ms,-3,dateadd(mm,datediff(m,0,getdate())+1,0))
Dateadd(yy,datediff(yy,0,getdate()),0)
Dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate())+1, 0))
上面的SQL代码只是一个时间段
Dateadd(wk,datediff(wk,0,getdate()),-1)
Dateadd(wk,datediff(wk,0,getdate()),6)
是表示本周旉D?
下面的SQL的条仉?是查询旉D在本周范围内的:
Where Time BETWEEN Dateadd(wk,datediff(wk,0,getdate()),-1) AND Dateadd(wk,datediff(wk,0,getdate()),6)
而在存储q程?
select @begintime = Dateadd(wk,datediff(wk,0,getdate()),-1)
select @endtime = Dateadd(wk,datediff(wk,0,getdate()),6)
11: 要求在表中显C出各工U之间工资最高的人的姓名Q工资和所在工U，表如下：
工号 姓名 工种 工资
001 张三 钛_ 1800
002 李四 车工 1800
003 王五 车工 1400
004 赵六 钛_ 1500
005 孙七 钛_ 1200
006 周八 车工 1500
007 钱大 工程?nbsp; 1800
008 张六 工程?nbsp; 2400
009 侯二 工程?nbsp; 2400
010 胡二 工程?nbsp; 2100?br>
l果要求如下图显C：
姓名 工种 工资
张三 钛_ 1800
李四 车工 1800
张六 工程?nbsp; 2400
侯二 工程?nbsp; 2400
select 姓名,工种,工资 from test t1 where 工资 in (select max(工资) from test t2 where t1.工种=t2.工种 group by 工种)
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