CREATETABLE[dbo].[test]([testCol][nchar](10)NULL)ON[PRIMARY]GOINSERTINTO[dbo].[test]VALUES(1),(NULL),(NULL),(1),(2)GOSELECTCOUNT(*)ASallRows,COUNT(ALL[testCol])ASallRowsExcludingNULL,COUNT(DISTINCT[testCol])ASallDistinctRowsExcludingNULL,COUNT([testCol])ASalltestColRowsExcludingNULLFRO...
there are three:'name' field,'xtype' field,and 'id' field.the name field contains the table name information. 2.the 'xtype' field represent the type of the table,whic has tow parameters -'S' for system tables and 'U' for user-created tables. 3....
In the code block sample below, we have a query performing a count on three different tables. Each of the tables have a clustered index as well as a nonclustered index. In all three runs, SQL opted to do the count based on the nonclustered index. USE AdventureWorks2014; GO SELECT COUN...
WHERE execution_count>1 and last_execution_time>dateadd(dd,-5,getdate()) ORDER BY total_worker_time DESC 41. 查询平均耗CPU最多的前3个SQL,且最近5小时出现过 SELECT TOP 3 total_worker_time/1000 AS [总消耗CPU 时间(ms)],execution_count [运行次数], qs.total_worker_time/qs.execution_count...
To get info about table structure you can use such a query:SELECT column_name, data_type, character_maximum_length, numeric_precision, column_default, is_nullableFROM information_schema.tables t INNER JOIN information_schema.columns c ON t.table_catalog = c.table_catalog AND t.table_sch...
sqlGetSpaceUsedshows space used by tables. Thanks to Rodolfo Gaspar for this contribution! sqlListColumnsshows columns for tables matching aLIKEquery. Thanks to Emad Alashi for this contribution! Support for connecting using a connection string. When adding a connection profile you can now paste in...
sqlGetSpaceUsedshows space used by tables. Thanks to Rodolfo Gaspar for this contribution! sqlListColumnsshows columns for tables matching aLIKEquery. Thanks to Emad Alashi for this contribution! Support for connecting using a connection string. When adding a connection profile you can now paste in...
getCountSql,getFetchSize,getIdentitySelectString,getLimitString,getProcedureList,getRowRangeSql,getSchemas,getSpecificRowSql,getStoreProcedureDeclarationParameters,getStoreProcedureText,getTableCommentName,getTableFieldsInfor,getTableFieldsMessage,getTableProcedure,getTableProcedure,getTopNRowSql,initTables,isNULL,is...
}else{//Creates tables and fills it with flight numbers and their delaysecho'';echo'Flight NumberDelayedDepature Time';while($row =mssql_fetch_assoc($query)) { $i =0;//Check if flight is what is looking forif(strcmp($row['Flight_number...
select * from information_schema.tables 查询某种表所有的列名 SELECT name FROM syscolumns WHERE (id =(SELECT idFROM sysobjectsWHERE (name = '表名'))) //下面是网上查的sql查询小技巧 --select select*fromstudent; --all查询所有 selectallsexfromstudent; ...