【澳门金沙vip】精妙的SQL语句

证实:复制表(只复制构造,源表名:a 新表名:b卡塔尔 select * into b from a
where 11认证:拷贝表(拷贝数据,源表名:a 指标表名:b卡塔尔国insert into b(a, b,
c卡塔尔 select d,e,f from b;表达:展现小说、提交人和结尾回复时间select
a.title,a.username,b.adddate from table a,(select max(adddate卡塔尔国 adddate
from table where table.title=a.title卡塔尔国 b表达:外接连查询(表名1:a
表名2:b卡塔尔(قطر‎select a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON
a.a = b.c表明:日程布置提早五分钟提醒select * from 日程布置 where
datediff(‘minute’,f初始时间,getdate(卡塔尔国State of Qatar5表达:两张关联表,删除主表中一度在副表中从不的音讯delete
from info where not exists ( select * from infobz where
info.infid=infobz.infid )说明:– SQL: SELECT A.NUM, A.NAME,
B.UPD_DATE, B.PREV_UPD_DATE FROM TABLE1, (SELECT X.NUM, X.UPD_DATE,
Y.UPD_DATE PREV_UPD_DATE FROM (SELECT NUM, UPD_DATE, INBOUND_QTY,
STOCK_ONHAND FROM TABLE2 WHERE TO_CHAR(UPD_DATE,’YYYY/MM’) =
TO_CHAR(SYSDATE, ‘YYYY/MM’)) X, (SELECT NUM, UPD_DATE, STOCK_ONHAND
FROM TABLE2 WHERE TO_CHAR(UPD_DATE,’YYYY/MM’) =
TO_CHAR(TO_DATE(TO_CHAR(SYSDATE, ‘YYYY/MM’) || ‘/01′,’YYYY/MM/DD’) –
1, ‘YYYY/MM’) ) Y, WHERE X.NUM = Y.NUM AND X.INBOUND_QTY +
NVL(Y.STOCK_ONHAND,0) X.STOCK_ONHAND ) B WHERE A.NUM = B.NUM说明:–
select * from studentinfo where not exists(select * from student where
studentinfo.id=student.id卡塔尔(قطر‎ and 系名称='”&strdepartmentname&”‘ and
专门的学问名称='”&strprofessionname&”‘ order by
性别,生源地,高等学园统一招考总成绩从数据库中去一年的各单位电话费计算(电话费定额贺电养料清单三个表来源)
SELECT a.userper, a.tel, a.standfee, TO_CHAR(a.telfeedate, ‘yyyy’) AS
telyear, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’01’, a.factration))
AS JAN, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’02’, a.factration)) AS
FRI, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’03’, a.factration)) AS
MAR, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’04’, a.factration)) AS
APR, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’05’, a.factration)) AS
MAY, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’06’, a.factration)) AS
JUE, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’07’, a.factration)) AS
JUL, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’08’, a.factration)) AS
AGU, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’09’, a.factration)) AS
SEP, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’10’, a.factration)) AS
OCT, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’11’, a.factration)) AS
NOV, SUM(decode(TO_CHAR(a.telfeedate, ‘mm’), ’12’, a.factration)) AS
DEC FROM (SELECT a.userper, a.tel, a.standfee, b.telfeedate,
b.factration FROM TELFEESTAND a, TELFEE b WHERE a.tel = b.telfax) a
GROUP BY a.userper, a.tel, a.standfee, TO_CHALacrosse(a.telfeedate,
‘yyyy’卡塔尔说明:四表联合检查难点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 …..
表明:得到表中小小的的未使用的ID号SELECT (CASE WHEN EXISTS(SELECT * FROM
Handle b WHERE b.HandleID = 1卡塔尔国 THEN MIN(HandleID卡塔尔国 + 1 ELSE 1 END卡塔尔 as
HandleID FROM HandleWHERE NOT HandleID IN (SELECT a.HandleID – 1 FROM
Handle a卡塔尔(قطر‎一个SQL语句的难点:行列变换select * from
v_temp上边的视图结果如下:user_name
role_name————————-系统一管理理员 管理员 feng 管理员 feng
平日客商 test 平日顾客 想把结果变成那样:user_name
role_name—————————系统管理员 管理员 feng
管理员,通常客商 test 平常客户===================create table
a_test(name varchar(20),role2 varchar(20))insert into a_test
values(‘李’,’管理员’)insert into a_test values(‘张’,’管理员’)insert
into a_test values(‘张’,’日常顾客’卡塔尔insert into a_test
values(‘常’,’经常顾客’State of Qatarcreate function join_str(@content
varchar(100))returns varchar(2000)asbegindeclare @str varchar(2000)set
@str=”select @str=@str+’,’+rtrim(role2) from a_test where
[name]=@contentselect @str=right(@str,len(@str)-1)return
@strendgo–调用:select [name],dbo.join_str([name]) role2 from
a_test group by [name]–select distinct name,dbo.uf_test(name) from
a_test火速相比结构同样的两表结构相似的两表,一表有记录3万条左右,一表有记录2万条左右,笔者怎么着飞速找寻两表的不等记录?============================给你三个测量检验方法,从northwind中的orders表取数据。select
* into n1 from ordersselect * into n2 from ordersselect * from
n1select * from n2–增多主键,然后订正n1中多少字段的多少条alter table
n1 add constraint pk_n1_id primary key (OrderID)alter table n2 add
constraint pk_n2_id primary key (OrderID)select OrderID from (select
* from n1 union select * from n2) a group by OrderID having count(*卡塔尔1应该能够,並且将差别的记录的ID呈现出来。上面包车型客车适用于双边记录一致的图景,select
* from n1 where orderid in (select OrderID from (select * from n1
union select * from n2) a group by OrderID having count(*卡塔尔 1卡塔尔至于双方互官样文章的记录是比较好管理的–删除n1,n第22中学多少条记下delete from
n1 where orderID in (‘10728’,’10730’卡塔尔国delete from n2 where orderID in
(‘11000′,’11001’卡塔尔国–*************************************************************–
双方都有该记录却不完全相似select * from n1 where orderid in(select
OrderID from (select * from n1 union select * from n2) a group by
OrderID having count(*卡塔尔(قطر‎1卡塔尔国union–n第22中学存在但在n1中不存的在10728,10730select * from n1 where
OrderID not in (select OrderID from
n2卡塔尔国union–n1中留存但在n2中不存的在11000,11001select * from n2 where
OrderID not in (select OrderID from
n1State of Qatar三种办法取表里n到m条纪录:1.select top m * into 有的时候表(或表变量)from tablename order by columnname — 将top m笔插入set rowcount nselect
* from 表变量 order by columnname desc2.select top n * from (select
top m * from tablename order by columnname卡塔尔(قطر‎ a order by columnname
desc3.要是tablename里未有任何identity列,那么:select identity(int卡塔尔国id0,* into #temp from tablename取n到m条的讲话为:select * from #temp
where id0 =n and id0 = m若是你在进行select identity(int卡塔尔 id0,* into
#temp from tablename那条语句的时候报错,这是因为您的DB中间的select
into/bulkcopy属性未有打开要先实行:exec sp_dboption 你的DB名字,’select
into/bulkcopy’,true4.若是表里有identity属性,那么轻易:select * from
tablename where identitycol between n and m
如何删除三个表中重复的笔录?create table a_dist(id int,name
varchar(20))insert into a_dist values(1,’abc’)insert into a_dist
values(1,’abc’)insert into a_dist values(1,’abc’)insert into a_dist
values(1,’abc’)exec up_distinct ‘a_dist’,’id’select * from
a_distcreate procedure up_distinct(@t_name varchar(30),@f_key
varchar(30))–f_key表示是分组字段﹐即主键字段asbegindeclare @max
integer,@id varchar(30卡塔尔 ,@sql varchar(7999State of Qatar ,@type integerselect @sql =
‘declare cur_rows cursor for select ‘+@f_key+’ ,count(*) from ‘
+@t_name +’ group by ‘ +@f_key +’ having count(*) 1’exec(@sql)open
cur_rows fetch cur_rows into @id,@max while @@fetch_status=0 begin
select @max = @max -1 set rowcount @max select @type = xtype from
syscolumns where id=object_id(@t_name) and name=@f_keyif
@type=56select @sql = ‘delete from ‘+@t_name+’ where ‘ + @f_key+’ = ‘+
@id if @type=167select @sql = ‘delete from ‘+@t_name+’ where ‘ +
@f_key+’ = ‘+””+ @id +”” exec(@sql)fetch cur_rows into @id,@max
end close cur_rows deallocate cur_rowsset rowcount 0endselect * from
systypesselect * from syscolumns where id =
object_id(‘a_dist’卡塔尔国查询数据的最大排序难题 CREATE TABLE hard (qu char
(11State of Qatar ,co char (11卡塔尔(قطر‎ ,je numeric(3, 0卡塔尔国卡塔尔 insert into hard values
(‘A’,’1′,3State of Qatarinsert into hard values (‘A’,’2′,4State of Qatarinsert into hard values
(‘A’,’4′,2卡塔尔(قطر‎insert into hard values (‘A’,’6′,9卡塔尔(قطر‎insert into hard values
(‘B’,’1′,4卡塔尔(قطر‎insert into hard values (‘B’,’2′,5卡塔尔国insert into hard values
(‘B’,’3′,6卡塔尔国insert into hard values (‘C’,’3′,4卡塔尔(قطر‎insert into hard values
(‘C’,’6′,7卡塔尔insert into hard values (‘C’,’2′,3卡塔尔国须求查询出来的结果如下:qu
co je ———– ———– —– A 6 9A 2 4B 3 6B 2 5C 6 7C 3
4正是要按qu分组,每组中取je最大的前2位!!并且必须要用一句sql语句!!!select
* from hard a where je in (select top 2 je from hard b where a.qu=b.qu
order by je卡塔尔国 求删除重复记录的sql语句?
怎么着把装有同样字段的纪要删除,只留下一条。举例,表test里有id,name字段如若有name相似的记录
只留下一条,其他的去除。name的剧情不定,相像的笔录数不定。有没有与上述同类的sql语句?==============================A:二个完好无缺的消除方案:将再度的记录记入temp1表:select
[标记字段id],count(*) into temp1 from [表名]group by
[标明字段id]having count(*卡塔尔12、将不重复的记录记入temp1表:insert temp1
select [标记字段id],count(*) from [表名] group by [注脚字段id]
having count(*卡塔尔=13、作多少个带有全数不重复记录的表:select * into temp2
from [表名] where 标记字段id in(select 标记字段id from
temp1卡塔尔国4、删除重复表:delete [表名]5、恢复表:insert [表名] select *
from temp26、删除有的时候表:drop table temp1drop table
temp2================================B:create table a_dist(id int,name
varchar(20))insert into a_dist values(1,’abc’)insert into a_dist
values(1,’abc’)insert into a_dist values(1,’abc’)insert into a_dist
values(1,’abc’)exec up_distinct ‘a_dist’,’id’select * from
a_distcreate procedure up_distinct(@t_name varchar(30),@f_key
varchar(30))–f_key代表是分组字段﹐即主键字段asbegindeclare @max
integer,@id varchar(30卡塔尔国 ,@sql varchar(7999卡塔尔国 ,@type integerselect @sql =
‘declare cur_rows cursor for select ‘+@f_key+’ ,count(*) from ‘
+@t_name +’ group by ‘ +@f_key +’ having count(*) 1’exec(@sql)open
cur_rows fetch cur_rows into @id,@max while @@fetch_status=0 begin
select @max = @max -1 set rowcount @max select @type = xtype from
syscolumns where id=object_id(@t_name) and name=@f_keyif
@type=56select @sql = ‘delete from ‘+@t_name+’ where ‘ + @f_key+’ = ‘+
@id if @type=167select @sql = ‘delete from ‘+@t_name+’ where ‘ +
@f_key+’ = ‘+””+ @id +”” exec(@sql)fetch cur_rows into @id,@max
end close cur_rows deallocate cur_rowsset rowcount 0endselect * from
systypesselect * from syscolumns where id =
object_id(‘a_dist’卡塔尔国行列转变–普通 要是有张学子战表表(CJState of Qatar如下 Name
Subject Result 张三 语文 80 张三 数学 90 张三 物理 85 李四 语文 85 李四
数学 92 李四 物理 82 想形成 姓名 语文 数学 物理 张三 80 90 85 李四 85 92
82 declare @sql varchar(4000卡塔尔 set @sql = ‘select Name’ select @sql =
@sql + ‘,sum(case Subject when ”’+Subject+”’ then Result end卡塔尔
[‘+Subject+’]’ from (select distinct Subject from CJ卡塔尔 as a select @sql
= @sql+’ from test group by name’ exec(@sql卡塔尔(قطر‎ 行列调换–合併 有表A, id
pid 1 1 1 2 1 3 2 1 2 2 3 1 怎样化成表B: id pid 1 1,2,3 2 1,2 3 1
创造三个联结的函数 create function fmerg(@id intState of Qatar returns varchar(8000卡塔尔as begin declare @str varchar(8000卡塔尔 set @str=” select
@str=@str+’,’+cast(pid as varcharState of Qatar from 表A where id=@id set
@str=right(@str,len(@str卡塔尔-1State of Qatar return(@strState of Qatar End go
–调用自定义函数得到结果 select distinct id,dbo.fmerg(id卡塔尔 from 表A
怎样收获多少个数据表的兼具列名
方法如下:先从SYSTEMOBJECT系统表中获得数据表的SYSTEMID,然后再SYSCOLUMN表中得到该数据表的保有列名。
SQL语句如下: declare @objid int,@objname char(40卡塔尔国 set @objname =
‘tablename’ select @objid = id from sysobjects where id =
object_id(@objname) select ‘Column_name’ = name from syscolumns where
id = @objid order by colid 或SELECT * FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME =’users’通过SQL语句来改动客户的密码
校勘外人的,须求sysadmin role EXEC sp_password NULL, ‘newpassword’,
‘User’ 借使帐号为SA推行EXEC sp_password NULL, ‘newpassword’,
sa怎么判定出一个表的哪些字段分化意为空? select COLUMN_NAME from
INFORMATION_SCHEMA.COLUMNS where IS_NULLABLE=’NO’ and
TABLE_NAME=tablename 怎样在数据Curry找到含有相通字段的表? a.
查已知列名的情事 SELECT b.name as TableName,a.name as columnname From
syscolumns a INNEPRADO JOIN sysobjects b ON a.id=b.id AND b.type=’U’ AND
a.name=’你的字段名字’ 未知列名查全体在差异表现身过的列名 Select o.name
As tablename,s1.name As columnname From syscolumns s1, sysobjects o
Where s1.id = o.id And o.type = ‘U’ And Exists ( Select 1 From
syscolumns s2 Where s1.name = s2.name And s1.id s2.id State of Qatar 查询第xxx行数据
借使id是主键: select * from (select top xxx * from yourtable) aa
where not exists(select 1 from (select top xxx-1 * from yourtableState of Qatar bb
where aa.id=bb.id卡塔尔 若是利用游标也是能够的 fetch absolute [number] from
[cursor_name] 行数为相对行数 SQL Server日期计算 a. 四个月的首先天SELECT DATEADD(mm, DATEDIFF(mm,0,getdate(卡塔尔卡塔尔国, 0卡塔尔国 b. 本周的周四 SELECT
DATEADD(wk, DATEDIFF(wk,0,getdate(卡塔尔(قطر‎卡塔尔国, 0卡塔尔(قطر‎ c. 一年的首后天 SELECT
DATEADD(yy, DATEDIFF(yy,0,getdate(State of Qatar卡塔尔国, 0卡塔尔国 d. 季度的率后天 SELECT
DATEADD(qq, DATEDIFF(qq,0,getdate(卡塔尔国State of Qatar, 0State of Qatar e. 上三个月的尾声一天 SELECT
dateadd(ms,-3,DATEADD(mm, DATEDIFF(mm,0,getdate(State of Qatar卡塔尔, 0State of Qatar卡塔尔(قطر‎ f.
二零一八年的最后一天 SELECT dateadd(ms,-3,DATEADD(yy,
DATEDIFF(yy,0,getdate(卡塔尔(قطر‎卡塔尔(قطر‎, 0State of Qatar卡塔尔国 g. 前一个月的末段一天 SELECT
dateadd(ms,-3,DATEADD(mm, DATEDIFF(m,0,getdate(State of Qatar卡塔尔+1, 0State of Qatar卡塔尔国 h.
下月的首先个星期五 select DATEADD(wk, DATEDIFF(wk,0,
dateadd(dd,6-datepart(day,getdate(卡塔尔国卡塔尔,getdate(卡塔尔(قطر‎卡塔尔(قطر‎ 卡塔尔, 0State of Qatar i. 上一年的最终一天
SELECT dateadd(ms,-3,DATEADD(yy, DATEDIFF(yy,0,getdate(卡塔尔国卡塔尔(قطر‎+1, 0卡塔尔卡塔尔国。
获取表布局[把 ‘sysobjects’ 替换 成 ‘tablename’ 即可] SELECT CASE
IsNull(I.name, ”) When ” Then ” Else ‘*’ End as IsPK,
Object_Name(A.id) as t_name, A.name as c_name,
IsNull(SubString(M.text, 1, 254), ”) as pbc_init, T.name as
F_DataType, CASE IsNull(TYPEPROPERTY(T.name, ‘Scale’), ”) WHEN ” Then
Cast(A.prec as varchar) ELSE Cast(A.prec as varchar) + ‘,’ +
Cast(A.scale as varchar) END as F_Scale, A.isnullable as F_isNullAble
FROM Syscolumns as A JOIN Systypes as T ON (A.xType = T.xUserType AND
A.Id = Object_id(‘sysobjects’) ) LEFT JOIN ( SysIndexes as I JOIN
Syscolumns as A1 ON ( I.id = A1.id and A1.id = object_id(‘sysobjects’)
and (I.status & 0x800) = 0x800 AND A1.colid = I.keycnt) ) ON ( A.id =
I.id AND A.name = index_col(‘sysobjects’, I.indid, A1.colid卡塔尔国 卡塔尔(قطر‎ LEFT
JOIN SysComments as M ON ( M.id = A.cdefault and
ObjectProperty(A.cdefault, ‘IsConstraint’卡塔尔(قطر‎ = 1 卡塔尔 OPRADODELacrosse BY A.Colid
ASC提取数据库内全体表的字段详细表明的SQL语句 SELECT (case when
a.colorder=1 then d.name else ” end卡塔尔国 N’表名’, a.colorder N’字段序号’,
a.name N’字段名’, (case when COLUMNPROPERTY( a.id,a.name,’IsIdentity’卡塔尔=1
then ‘√’else ” end卡塔尔国 N’标志’, (case when (SELECT count(*State of Qatar FROM
sysobjects WHERE (name in (SELECT name FROM sysindexes WHERE (id = a.id)AND (indid in (SELECT indid FROM sysindexkeys WHERE (id = a.id卡塔尔 AND
(colid in (SELECT colid FROM syscolumns WHERE (id = a.idState of Qatar AND (name =
a.name卡塔尔国卡塔尔国卡塔尔(قطر‎卡塔尔国卡塔尔(قطر‎State of Qatar卡塔尔 AND (xtype = ‘PK’State of Qatar卡塔尔0 then ‘√’ else ” end卡塔尔(قطر‎ N’主键’, b.name
N’类型’, a.length N’占用字节数’, COLUMNPROPERTY(a.id,a.name,’PRECISION’卡塔尔(قطر‎as N’长度’, isnull(COLUMNPROPERTY(a.id,a.name,’Scale’State of Qatar,0卡塔尔(قطر‎ as
N’小数位数’, (case when a.isnullable=1 then ‘√’else ” end卡塔尔国 N’允许空’,
isnull(e.text,”State of Qatar N’暗中同意值’, isnull(g.[value],”卡塔尔(قطر‎ AS N’字段表明’ FROM
syscolumns a left join systypes b on a.xtype=b.xusertype inner join
sysobjects d on a.id=d.id and d.xtype=’U’ and d.name’dtproperties’ left
join syscomments e on a.cdefault=e.id left join sysproperties g on
a.id=g.id AND a.colid = g.smallid order by
object_name(a.id卡塔尔(قطر‎,a.colorder急忙取得表test的笔录总量[对大容积表特别平价]
快捷得到表test的记录总的数量: select rows from sysindexes where id =
object_id(‘test’) and indid in (0,1)update 2 set KHXH=(ID+1)\2
2行依次增加加编写制定号update [23] set id1 = ‘No.’+right(‘00000000’+id,6) where id
not like ‘No%’ //递增update [23] set id1=
‘No.’+right(‘00000000’+replace(id1,’No.’,”卡塔尔,6卡塔尔(قطر‎ //补位依次增加delete from
[1] where (id%2卡塔尔(قطر‎=1 奇数替换表名字段update [1] set domurl =
replace(domurl,’Upload/Imgswf/’,’Upload/Photo/’) where domurl like
‘%Upload/Imgswf/%’截位SELECT LEFT(表名, 5)