SQL 查询 信息

select name,modify_date from sys.all_objects where type='P' order by modify_date desc

select name,modify_date from sys.all_objects where type='TR' order by modify_date desc

select name,modify_date from sys.all_objects where type='u' order by modify_date desc

select user_type_id,name,is_table_type from sys.types where is_user_defined=1 order by user_type_id desc

 --sql语句查询一个表的列数

select count(name) from syscolumns where id=(select id from sysobjects where xtype='u' and name='Bms_Tasks')

SELECT sys_o.name as TableName,sys_o.name as ColumnName
From syscolumns sys_c INNER JOIN sysobjects sys_o
ON sys_c.id=sys_o.id
AND sys_o.type='U'
AND sys_c.name='你所需要查找的字段名字'

select * from (SELECT TOP 100
--创建时间
QS.creation_time,
--查询语句
SUBSTRING(ST.text,(QS.statement_start_offset/2)+1,
((CASE QS.statement_end_offset WHEN -1 THEN DATALENGTH(st.text)
ELSE QS.statement_end_offset END - QS.statement_start_offset)/2) + 1
) AS statement_text,
--执行文本
ST.text,
--执行计划
QS.total_worker_time,QS.last_worker_time,QS.max_worker_time,QS.min_worker_time

FROM sys.dm_exec_query_stats QS
--关键字
CROSS APPLY sys.dm_exec_sql_text(QS.sql_handle) ST ) My_Table
WHERE My_Table.creation_time BETWEEN '2013-8-21 16:00:00' AND '2013-10-20 17:00:00'
AND My_Table.statement_text LIKE '%%'
ORDER BY My_Table.creation_time DESC

查某一列(或多列)的重复值(只可以查出重复记录的值，不能查出整个记录的信息)

例如:查找stuid，stuname重复的记录

select stuid，stuname from stuinfo

group by stuid，stuname

having(count(*))>1

--在SQL查询分析器里运行查找其中一个数据库内的所有表的行数

if exists (select * from tempdb.dbo.sysobjects where id = object_id(N'tempdb..#T') and type='U')
drop table #T

CREATE TABLE #T ([name] nvarchar(255),rows bigint)
DECLARE @Name nvarchar(255),@Sql nvarchar(4000)
DECLARE TName CURSOR FOR
SELECT [name] FROM sysobjects WHERE xtype = 'U'
OPEN TName
FETCH NEXT FROM TName
INTO @Name
WHILE @@FETCH_STATUS = 0
BEGIN
SET @Sql='INSERT INTO #T ([name],rows) SELECT '''+@name+''' AS name, COUNT(1) AS row FROM '+@name
EXEC(@Sql)
FETCH NEXT FROM TName INTO @name
END
CLOSE TName
DEALLOCATE TName
SELECT * FROM #T

--根据已知的主键查询所有引用这个主键的外键约束的名称

SELECT OBJECT_SCHEMA_NAME(parent_object_id) AS SchemaName
, OBJECT_NAME(parent_object_id) AS TableName ,Name FROM sys.foreign_keys
WHERE referenced_object_id=OBJECT_ID('dbo.Bms_JobTicket')