http://blog.csdn.net/smahorse/article/details/8156483 --SQL Server 查询表的记录数 --one: 使用系统表. SELECT object_name (i.id) TableName, rows as RowCnt FROM sysindexes i INNER JOIN sysObjects o ON (o.id = i.id AND o.xType = 'U ') WHERE indid < 2 ORDER BY TableN

--建立一张表 create table cat( catId int, catName varchar(40) ) --将下边的插入语句,多执行几次. insert into catvalues(1,'aa') select * from cat 通过查询语句将看到表中出现N个重复记录 --如何删除掉一张表重复记录 步骤如下: --1.把cat表的记录distinct后的结果,放到临时表中 select  distinct * into #temp from cat --2.把cat表的记录清

文章一:SQL Server中如何基于一个表的数据更新另一个表的对应数据的SQL语句脚本 https://codedefault.com/2017/sql-server-update-from-a-select 方式一 INNER JOIN UPDATE Table_A SET Table_A.col1 = Table_B.col1, Table_A.col2 = Table_B.col2 FROM Some_Table AS Table_A INNER JOIN Other_Table AS

现在有一张表如下Id Name Age Classify Score1 张一 18 一班 122 张二 17 二班 19 3 张三 19 三班 30 我跟据他们的分数进行排名 再去新建一个列存储排序值 ->sql语句如下 select row_number() over(order by Score asc) as number,Id,Name,Age,Classify,Score from u_College order by Score;->产生的效果如下 number Id Name A

sql server在执行查询语句时会锁表.在锁表期间禁止增删改操作. 如果不想锁表,那就再表名或别名后面加上WITH(NOLOCK) 如下所示:

今天有网友群里提了这样一个关于SQL联合查询的需求: 一.有热心网友的方案: 二.我的方案: select * from ( select a.*,(select top 1 Id from B as b where b.CgId =a.ID)as bid from A as a ) as temp left join B as b2 on temp.bid=b2.Id

SELECT B.NAME,A.ROW_COUNT FROM SYS.DM_DB_PARTITION_STATS A,SYS.OBJECTS BWHERE A.OBJECT_ID=B.OBJECT_ID AND A.INDEX_ID<=1AND B.TYPE='U'AND A.ROW_COUNT>8000   ORDER BY  ROW_COUNT  DESC

一.查询数据库(sys.databases —— select *from sys.databases where name='<数据库名>') select *from sys.databases where name='MyDatabase' 二.查询表(sysobjects —— select *from sysobjects where id=OBJECT_ID('<表名>')) select *from sysobjects where id=OBJECT_ID('Stu

SELECT 表名 then d.name else '' end, 表说明 then isnull(f.value,'') else '' end, 字段序号=a.colorder, 字段名=a.name, 标识 then '√'else '' end, 主键 FROM sysobjects where xtype='PK' and name in ( SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexk

a) 插入新表 select * into newtable from table b) 插入已经存在的表 insert into table select * from table2 where...

1 SELECT 索引名称=a.name 2 ,表名=c.name 3 ,索引字段名=d.name 4 ,索引字段位置=d.colid 5 FROM sysindexes a 6 JOIN sysindexkeys b ON a.id=b.id AND a.indid=b.indid 7 JOIN sysobjects c ON b.id=c.id 8 JOIN syscolumns d ON b.id=d.id AND b.colid=d.colid 9 WHERE a.indid NOT I

;with cte as ( select * from Associator where No = 'mc1007' union all select air.* from Associator as air inner join cte on air.ParentNo = cte.No ) select * from cte;

select object_name(id) tablename, 8*reserved/1024 reserved, rtrim(8*dpages)+'kb' used, 8*(reserved-dpages)/1024 unused, 8*dpages/1024-rows/1024*minlen/1024 free, rows --,* from sysindexes where indid=1 order by tablename,reserved desc

select name from sysobjects where xtype='u' order by name

SELECT a.name, b.rows FROM sysobjects AS a INNER JOIN sysindexes AS b ON a.id = b.id WHERE ( a.type = 'u' )  AND ( b.indid IN ( 0, 1 )) ORDER BY a.name, b.rows DESC

SELECT obj.name tablename, CAST ( CASE WHEN (SELECT COUNT() FROM sys.indexes WHERE object_id= obj.OBJECT_ID AND is_primary_key=) >= THEN ELSE END AS BIT) HasPrimaryKey from 数据库名.sys.objects obj where type='U' or type='V' order by obj.name

BEGIN TRAN BEGIN END DROP TABLE IF EXISTS tempdb..#t CREATE TABLE #t ( spid int, dbid int, ObjId int, IndId int, Type ), Resource ), Mode ), Status ), CREATEDT DATETIME DEFAULT(GETDATE()) ) BEGIN INSERT INTO #t ( spid,dbid,ObjId,IndId,Type,Resource,M

CREATE TABLE [dbo].[A](    [ID] [int] NULL,    [NAME] [varchar](50) NULL,    [SEX] [varchar](50) NULL,    [AGE] [int] NULL) ON [PRIMARY]; CREATE TABLE [dbo].[B](    [ID] [int] NULL,    [NAME] [varchar](50) NULL,    [SEX] [varchar](50) NULL,    [AGE]

SELECT a.name, b.rows FROM sysobjects AS a INNER JOINsysindexes AS b ON a.id = b.idWHERE (a.type = 'u') AND (b.indid IN (0, 1))ORDER BY b.rows DESC

--我加了 top 10 用的时候可以去掉 declare @select_alltableCount varchar(max)='';with T as (select top 10 'SELECT '''+name+ '''as Table_Name, COUNT(1) as Row_Count From '+ name + char(10)+ ' union all ' as A  from sys.objects where type='U' order by name asc),T2

select count(1) from information_schema.columns where table_schema='dbname' and table_name='tbname;