tsql book

difference between the @start DATETIME variable and the current time obtained with the GETDATE () function. In my case, the first loop takes 10,000 times, and the second loop 90,000 times takes 110 seconds. 　　CPU Time Another important performance measurement is the number of CPUs your query needs to return a result set. In the previous section, the CPU time for each statement was displayed in a batch file when I was using the SET STATISTICS time on statement. So this is the first method you ca

Tags: create results Runtime book ETL mode assignment SQL dataTypically, an ETL engineer creates an agent job to periodically execute a stored procedure that package,agent the underlying call SSISDB (catalog.start_execution) to initiate an execution instance in synchronous mode, which means that We can simulate the behavior of the agent job and execute the package using the TSQL script. Each time the SSIS e

As we discussed earlier on how to use indexes correctly, adjusting indexes is the fastest performance tuning method, but in general, adjusting indexes only improves query performance. In addition, we can adjust the data access code and TSQL, this article describes how the best way to refactor data access code and TSQL. Step Fourth: Migrate the TSQL code from the

1. View the information for the tableIn the TSQL editor, select a table,Click Alt+f1 to view the table's attribute definitions2, use ALT to BULK INSERT commasUsing the IN clause in the TSQL, in the (value_list) list, there are often many numbers, how to quickly add commas, you can use the ALTThe TSQL code is as follows, place the mouse in front of 19, click Alt,

Some TSQL statements with statistical functions (such as DBCC statements, global functions, and system stored procedures) can also help you understand and monitor SQL server running status DBCC statements, the DBCC statement is the Database Console Command of SQL2005. the DBCC statement can not only check the performance and activity of the database, but also check the physical and logical consistency of the database. Some

How to know how long the TSQL statement has been runningDeclare @ms_per_tick decimal(Ten,6)--millisecond per tickSELECT @ms_per_tick=1.0*DateDiff(Millisecond,sqlserver_start_time,getdate())/(ms_ticks-sqlserver_start_time_ms_ticks) fromSys.[Dm_os_sys_info];--SELECT @ms_per_tickSelectReq.session_id,req.start_time Request_start_time, ((SelectMs_ticks fromsys.dm_os_sys_info)-Workers.task_bound_ms_ticks)*@ms_per_tick 'Ms_since_task_bound',DATEDIFF(Ms,re

System.drawing.size-argumentlist 80, 15$label 2. Text = "User name:"$textbox 2=new-object System.Windows.Forms.TextBox$textBox 2.Multiline = $true;$textBox 2.Text = ""$textBox 2.Size = New-object system.drawing.size-argumentlist 150, 15$textBox 2.Location = New-object system.drawing.point-argumentlist 90, 50#获取第三个参数$label 3 = New-object System.Windows.Forms.Label;$label 3. Location = New-object System.drawing.point-argumentlist 1, 90$label 3. Size = New-object System.drawing.size-argumentlist 8

1, demand analysisImplement hierarchies in TSQL, such as a data structure, province, city, County, township, village, how to use a table to represent this data structure, and allow is asymmetric, for example, Shanghai is a municipality, there is no province.Create Table dbo.hierarchy (ID intnotnullprimarykey, --type int not NULL,intnotnullvarchar( - not NULL )The type represents the types, which can be set: Province, type is 1, city, type is 2, an

Label:Using execute and sp_executesql to implement dynamic TSQL, how to get the return value of dynamic TSQL? Part I.: Execute 1,execute is a function that executes an SQL statement, and the example statement is as follows Declare @sql nvarchar(Max) Declare @return_cnt int if object_id('tempdb: #tempcnt') is not NULL Drop Table#tempcnt Create Table#tempcnt (CNTint) Set @sql=N'INSERT INTO #tempcnt select

The syntax of plsql is different from that of tsql. For more information, see. The syntax of plsql is different from that of tsql. For more information, see. Insert into testtable (recordnumber, currentdate) values (I, sysdate ); Print ''; Select @ I = @ I + 1; End; After comparison, we can see that it is different. The command structure in plsql is Delacre Define statement segments Begin Execution state

The syntax of plsql is different from that of tsql. For details, refer. The syntax of plsql is different from that of tsql. For details, refer. Mathematical functions 1. Absolute Value S: select abs (-1) value O: select abs (-1) value from dual 2. INTEGER (large) S: select ceiling (-1.001) value O: select ceil (-1.001) value from dual 3. Round (small) S: select floor (-1.001) value O: select floor (-1.00

Tags: logs convert weight made with int span app DivSQL Server Profiler caught a lot of code in the job, applicationname similar to Sqlagent-tsql JobStep (Job 0x94b9b5c016e8d94fb50898c868314d08:st EP 1) Such a Need to convert the binary name in the job into job_id The conversion is done in the following ways: Declare @JobID uniqueidentifier SELECT @JobID = 0x94b9b5c016e8d94fb50898c868314d08 PRINT 'My JobID is' + Convert(Char(255),@JobID) Select *

TABLE Kecheng(Code varchar (primary key),Name varchar (20));CREATE TABLE Teacher(Code varchar (primary key),Name varchar (20));CREATE TABLE Chengji(IDS int Auto_increment primary KEY,SCODE varchar (20),Kcode varchar (20),degree float,Foreign KEY (SCODE) references student (code),Foreign KEY (Kcode) references Kecheng (code));CREATE TABLE Tkecheng(IDS int Auto_increment primary KEY,Tcode varchar (20),Kcode varchar (20),Foreign KEY (Kcode) references Kecheng (code),Foreign KEY (Tcode) references

In TSQL, there is a exists clause that indicates that there is a match on any row of data, but how to represent the entire row of data. For example, it means that a student took all courses, which is a classic example of the "match all" semantics.example, get the name of the student "take all " course1, create instance data--CREATE TABLECreate Tabledbo.student (Student_noint, Student_namevarchar(Ten))Create TableDbo.course (Course_noint, Course_nameva

Label:Original Ode-tsql convert Query to JSONTsql-query to JSONIt is my philosophy, good development starts with the data. I have all stressed whenever possible allow your data processing to take place on your SQL Server or database Processin G engine and rendering of the data to the application control engine. By the time your application server receives the data it should is in the truncated, filtered, limited by rows, converted To correct formats,

Label:Lead and Lag are two analytic functions in TSQL, and the order of execution is used to move forward and back the result set of a query after the SELECT statement. If the window function does not partition the result set of the query, the entire result set is treated as a partition, and if the window function partitions The result set of the query, then the lead and lag are the forward and post-move operations on the partition. A window is define

The original post source csdn, the specific post cannot be remembered, And I modified it a bit based on the original one: If exists (select * From DBO. sysobjects where id = object_id (n' [DBO]. [p_createjob] ') and objectproperty (ID, n' isprocedure') = 1)Drop procedure [DBO]. [p_createjob]Go Create proc p_createjob@ Jobname varchar (100), -- job name@ SQL varchar (8000), -- command to be executed@ Servername sysname = '', -- job server name@ Dbname sysname = '', -- the default value is the cur

As a DBA, you must deal with a variety of tsql code. See the following three examples: 1: parentheses are used in distinct: SELECT DISTINCT (TransactionID),ProductID,TransactionTypeFROM adventureworks.Production.TransactionHistoryArchive The results are exactly the same as those in the following sentence, but the above sentence may be confusing. Is it true that transactionid removes duplicate items or that all columns are combined to remove dupl

Control characters in tsql Char can be used to insert control characters into strings. The following table shows some common control characters.Control Character ValueChar (9)Linefeed char (10)Carriage return character char (13) Example: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Print ' --------------------- ' Print Char ( 9 ) + ' Hello ' Print '

Create TableTablesize (namevarchar( -), Rowsint, reservedvarchar( -), Datavarchar( -), index_sizevarchar( -), unusedvarchar( -))Insert intotablesize (name,rows,reserved, data,index_size,unused)execSp_msforeachtable@Command1="Sp_spaceused'?'" UpdateTablesizeSetData=Replace(Data,'KB',"') Select *,Convert(int, data) asA fromTablesizeOrder byAdesc Drop TabletablesizeDELETE fromlocalcopyof_vw_poitemvaluesEXECsp_spaceusedSELECT * from [Master].[dbo].[sysprocesses] WHERE [DBID] inch ( SELECT [