sql server update table from another table

Lock a table in a database The code is as follows Copy Code SELECT * from table with (HOLDLOCK) Note: The difference between a table that locks a database The code is as follows Copy Code SELECT * from table with (HOLDLOCK) Other transactions

SQL Server lock table, unlock, and view sale table, Lock a table in the database Copy codeThe Code is as follows:SELECT * FROM table WITH (HOLDLOCK) Note: What is the difference between locking a database

operation subquery (exists means "exists", the subquery behind it does not produce a query result, but instead produces a logical value of TRUE or false, when the word query has a record that is found to be true, Conversely, false to display results only if the subquery result is true)Cases:Use Commodity Management databaseGoSelect customer name, contact phone from Customer information table where exists (SELECT * From Sales Information

Label:1. Understand the database and create new: 1) Open the database and connect to the server. 2) service type without tube. 3) server name: Make a point "." Indicates that the server is on the local computer and, if it is hosted on someone else's server, enter the server

How to determine the existence of a table or database in SQL server, but in actual use, you need to determine the Status bit:Some status bits can be set by the user using sp_dboption (read only, dbo use only, single user, etc: 1 = autoclose; Use sp_dboption to set. The database is completely closed, and its resources are released after the last user logs out.4 =

Lock a table in a database Copy Code code as follows: SELECT * from table with (HOLDLOCK) Note: The difference between a table that locks a database Copy Code code as follows: SELECT * from table with (HOLDLOCK) Other transactions can read the

1. Build a table1 IF object_id (n ' table name ', n ' U ') is NULL CREATE table table name (2 ID INT IDENTITY (1, 1) PRIMARY KEY ,......);2. Query all tables that meet the criteria1 SELECT 2 NAME3from4 sys.objects5WHERE 6 type = ' u '7 and NAME like ' test_% ';3. Bulk delete a table that meets the crite

1. sysjobactivity table Record the activity and status of the current SQL Server proxy job. Job_id: Job IDRun_requested_date: date and time when the job is requested to runRun_requested_source: the requester requesting to run the job. 1 = source_scheduler, 4 = source_userStart_execution_date: date and time when the job is scheduled to runJob_history_id: used

"Which of the following is more efficient for SQL Server insert operations in heap tables or clustered index tables? Why is it high ?" Some colleagues have asked me this question before. To ensure the record efficiency of the logstore, I did a simple test. I should first emphasize the following concepts: Heap table:For a table without clustered indexes, th

SQL Server Table Management _ about the operation of the table and adding and modifying the operation of the detailed (case code)Overview:Tables consist of rows and columns, and each table must have a table name.SQL CREATE

Temporary tables are divided into:Local temporary table, limited to the current visitor access, the creation method goes as follows:CREATE table #TableName (table structure)stored in database tempdb (hard disk), current user disconnects (put current), automatically deletedIf you are continuing to open a connection in use and do not need the temporary

), which is replaced by decimal (1,492 ), you can then use the dbcc page command described in the previous section to view the PAGE information, as shown in: You can see the specific data. The returned results on this interface will vary depending on the clustered index and non-clustered index on the table. To view the total number of pages and partitions used by a table, run dbcc showconfig, as shown in:

Cursors are usually used to traverse tables on SQL Server. in SQL Server, you can easily use cursors to implement loops and traverse records in tables on SQL Server. This article describes how to use

Cursors are usually used to traverse tables on SQL Server. in SQL Server, you can easily use cursors to implement loops and traverse records in tables on SQL Server. This article describes how to use

Label:Temporary tables and table variables can play a "temporary" role, so what are the main differences between the two?This is not discussed here, as well as the global temporary table, the session temporary table these, the main record of the individual on the main difference between the two and the application of the view, there is nothing wrong or complement

intoScoreValues(3,'3-105', -)Insert intoScoreValues(4,'3-105', -)Insert intoScoreValues(5,'3-105', -)Insert intoScoreValues(6,'3-105', -)--Business: To ensure the complete implementation of the entire process, all without problems, unified submission, once there is a problem, back to the origin. Like bank transfers.Begin Tran--z The start of the transaction--start writing the process statement--After the statement is finishedIf @ @ERROR >0Rollback tran--ROLLBACK TRANSACTIONElseCommit Tran--

the rest of the afternoon was thrown to a task: To import street data from across the country into a street table. But the SQL script they threw me was down from the web, completely different from the database design on this side of the platform. the idea was to first generate a table locally on the script that was thrown at me, and then select the data you want

When IDENTITY_INSERT is set to OFF, you cannot insert an explicit value into the identity column in table ' #TT '.I was in SQL Server to write the stored procedure encountered this error, then thought: how the temporary table has a primary key, I also did not set the primary key.Then I worked with my colleagues to debu

Server Partitioned TableScalability is an important aspect of a database management system that provides table partitioning capabilities in terms of scalability in SQL Server 2005.In fact, for the relational database products, the table, database and

) + "" " --datetime when @xtype= - Then "" "+convert (char),'+@name+', +) + "" " --smalldatetime when @xtype= $ Then "" "+convert (char),'+@name+')+ "" " --uniqueidentifier Else @name End End End Fetch Next fromSyscolumns_cursor into @name,@xtype End CloseSyscolumns_cursordeallocateSyscolumns_cursorSet @sql='SET NOCOUNT ON select"'Insert into'+@tablename+'('+@colum