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publishing side with the verification subscription function at the publisherMethod Seven: Compare the checksum values of the contents of two tables with checksum checkBut this approach is only confined to the two-table structure.I copy the data from the [t1_new] table to a new table for comparisonSELECT * from [dbo].[t1_new]SELECT * from [dbo].[T1_newreplica]SELECT SUM(CHECKSUM (*)) asChecksumvalue from
function at the publisherMethod Seven: Compare the checksum values of the contents of two tables with checksum checkBut this approach is only confined to the two-table structure.I copy the data from the [t1_new] table to a new table for comparisonSELECT * from [dbo].[t1_new]SELECT * from [dbo].[T1_newreplica]SELECT SUM(CHECKSUM (*)) asChecksumvalue from [dbo].[T1_old]SELECT SUM(CHECKSUM (*)) asChecksumva
Start
A while ago, a project encountered such an SQL query requirement. There were two tables with the same structure (table_left table_right), as shown below:
Figure 1.
Check whether there is a group of (groupId) data in table table_right that is exactly the same as its data.
1. We can see that the table_left and table_right tables have two groups of data that
Differences between temporary tables in Oracle and temporary tables in SQL Server compared with the process of creating temporary tables in Oracle databases and the differences between
Begin
A while ago, there was an SQL query requirement in the project, with two tables of the same structure (Table_left Table_right), as follows:
Figure 1.
Examine the groups (GROUPID) of the table table_left, and whether there is a set of (GROUPID) data in the table table_right that is exactly the same as its data.
As shown in Figure 1. You can see that there are two sets of data complete equality f
Differences between Oracle temporary tables and SQL Server temporary tables:
The process of creating a temporary table in the Oracle database and the difference between the temporary table and the SQL
The syntax of the create statement is the same, and the data types are different.
However, the syntax for creating a table using subqueries is different.
SQL Server statements created using subqueries:Select empno, ename, Sal * 12 annsal, hiredate into dept30 from EMP where deptno = 30;
Oracle uses query to create a table:Create Table dept30
Select empno, ename, Sal * 12 annsal, hiredate
From EMP
Where de
Start
A while ago, a project encountered such an SQL query requirement. There were two tables with the same structure (table_left table_right), as shown below:
Figure 1.
Check whether there is a group of (groupId) data in table table_right that is exactly the same as its data.
1. We can see that the table_left and table_right tables have two groups of data that
@t1_newcount=COUNT (*)FromT1_new;SELECT@count=COUNT (*)From[T1_old]AsAINNERJOIN[T1_new]As BOn[B].[Id]=[A].[Id]and[B].[Log_time]=[A].[Log_time]-- If there are other fields in the table that you add yourself print print @t1_newcount if ( @count = @t1_newcount ) begin ' equal "end else begin select Span style= "color: #ff0000;" > ' Method five: With SQL Server's own Tablediff tool, Microsoft made this tool to comp
Differences between temporal tables and data tables in SQL Server1, how to determine the temporary table and the data table has been generated--how to tell if a temporary table has been created---if exists(Select * fromTempdb.. sysobjectswhereId=object_id('tempdb: #Temp_Student')) begin Print 'temporary tabl
SQL Server temporary tableYou can also create a temporary table. Temporary tables are similar to permanent tables, but temporary tables are stored in tempdb. They are automatically deleted when they are no longer used.There are two types of temporary
prefixed, only the local user connection can be accessed. The names of global table variables are prefixed with "@". Generally, they are system global variables. For example, @ error indicates the error number, @ rowcount indicates the number of affected rows.
For example, let's look at the statement for creating table variables:
Declare @ news table (news_id int not null,
Newstitle varchar (100), newscontent varchar (2000), newsdatetime)
You can select, insert, update, and delete
one type of variables. Table variables are also divided into local and global variables. The names of local table variables are prefixed, only the local user connection can be accessed. The names of global table variables are prefixed with "@". Generally, they are system global variables. For example, @ error indicates the error number, @ rowcount indicates the number of affected rows.
For example, let's look at the statement for creating table variables:SQL code
Declare @ news table
(
News
indicates the error number, @ rowcount indicates the number of affected rows.
For example, let's look at the statement for creating table variables:
DECLARE @ News Table(News_id int not null,NewsTitle varchar (100 ),NewsContent varchar (2000 ),NewsDateTime datetime)
You can select, insert, update, and delete SQL statements to compare temporary tables
A Left JOINIntfsimsnew. SYSOBJECTS B onA.name = B.nameWHEREISNULL (B.name,"') ="' andA.xtype =' U 'ORDER by 1,2--Compare the differences of each table field in two databasesSELECTTable name A = Case whenISNULL (A.tablename,"') "' ThenA.tablenameELSEB.tablenameEND, field name A = a.fieldname, field name B = b.fieldname, order = a.fieldsno, Description = Case whenA.fieldtype Then ' type: '+ A.fieldtyp
Truncate table
Not allowed
Allow
Destruction mode
Automatic destruction after batch finishes
Explicitly call the DROP TABLE statement. Current session End auto-destructor (Global temp table: Also included when other conversational sentences are not in the reference table.)
Transaction
Only have a transaction when the table is updated, the duration is shorter than the temporary table
Normal transaction length, longer than ta
user account (or the corresponding ID of the account ). When other users log on to the system, the system first queries from this temporary table to check whether the same user records exist. If yes, the user will be rejected and the user will be warned that the same user has logged on. When the user exits the system normally or ends the current session due to other reasons, the database system will clear the contents of this table. In this way, you can log on to the system even if you log on t
1,
Reprinted: http://database.ctocio.com.cn/tips/442/8206442.shtml
In SQL Server performance tuning, there is an incomparable problem: that is, how to process temporary datasets in a code that requires a long time or frequently called code? Table variables and temporary tables are two options. I remember seeing a large number of temporary data set processing requ
One, table variables
Table variables were introduced for the first time in SQL Server 2000. The specific definition of a table variable includes a column definition, a column name, a data type, and a constraint. Constraints that can be used in table variables include primary KEY constraints, UNIQUE constraints, NULL constraints, and CHECK constraints (foreign KEY constraints cannot be used in table variabl
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