create trigger for insert update delete sql server

--Create, delete temporary tables --The first way create TABLE #tmp (name varchar (255), id int)- -The second way select COUNT (id) as Storynum, sum (convert (Numeric (10,2), Case if IsNumeric (code) =1 then code else 0 end)) As Codenum, sum ((Case when IsNumeric (realcode) =1 then convert (numeric (10,2), realcode) else 0.0)) as Realcodenum, tdtname,cy

needs to be displayed in the result setStatisticsInformation, The optimizer will select the best execution method, because the optimizer willStatisticsInformation. InCreateWhen indexing, SQLServer will be on the index ColumnCreateStatisticsInformation. To put it simply,StatisticsInformationThat is, the data that can describe the data distribution in the index or column. Query selectivity: Formula: Total number of non-duplicated data in a column/total number of data in a column The higher the s

Comparison with MSSQL to learn about MYSQL (8) -- insert, update, delete, and mssqlmysql Similarly, it will only explain the difference between SQL Server and SQL Server.

structure without data Method Two actually is also good is a method of the MS SQL self-brought first to have a full backup of the database this is more important than the other is relatively simple Back up the thing log and then in the options to back up the log tail with these 2 things basically OK first restore the complete database Select this do not roll back and then restore the things log Choose the time period when the wrong operation was

SQL CREATE trigger and get the value just inserted CREATE TRIGGER [t1_test] on [dbo]. [T1] For insert As Begin declare @cmd sysname, @var sysname Select @var =ltrim (ID) from inserted Set @cmd = ' echo ' + @var +

code is as follows: DELETE From Navtion_TopSubject Where fYopID = 'aaa' (assume that the main category to be deleted is news and the primary key number is aaa) 4. In this way, we can use this aaa to find whether the sub-category table and content table have content. 5. Using the deleted table, the table is logically deleted, which is equivalent to the recycle bin in Windows. SQL

set Class_num=class_num + 1 where class_id= (select class_id fr Om inserted)--test insert into student values (' 0602011 ', ' text ', ' female ', ' 1986-09-21 ', ' 0602 ')--2) created on studentDelete TriggerStu_delete, this trigger updates the Class_nun column in the class table when a record is required to be deleted in the student table. and test the trigger

server| View View is often used recently, but MSSQL server does not allow the update of view that is more than two base tables associated with it. As a result of the project needs, spent a night to study it. Take some time to record the process and the experience. Let's look at the authoritative statement: Updatable views: Microsoft

Yesterday found in the program data analysis results are not, after the analysis, the original data is still, the value of the field is cumulative. Heart said, not Ah, is to regenerate records before the analysis of AH. Did you forget to delete it? Check the code, found that there are DELETE statements. Then execute in Query Analyzer, error. Try again and again, understand,

) def fetchone_test (): ''' query a piece of data... '''print ('queries a piece of data... ') fetchone_ SQL = 'select * FROM student WHERE ID =? 'Data = 1 conn = get_conn (DB_FILE_PATH) fetchone (conn, fetchone_ SQL, data) def update_test (): ''' update data... '''print ('Update data... ') update_

Tags: SQL Server tables, views, indexesFirst, the table related1. Create Use[test] Go setansi_nullson go setquoted_identifieron go CREATETABLE[dbo] . [Ceshi] ([Id][int]notnull, [Name][varchar (]null), CONSTRAINT[PK_Ceshi] primarykeyclustered ([Id]asc) with (Pad_index=off,statistics_ norecompute=off,ignore_dup_key=off,allow_row_locks=on, Allow_page_lo