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System tables: User-defined tables operate on the data they populate. For SQL Server, the user-defined table is equivalent to the data populated by the system tables, so the system table is used to manipulate the user database.Data table
Temporary tables, table variables, and CTE are commonly used in SQL Server to store temporary table data, and here is a brief introduction to the different and different scenarios in which they are used.CteA CTE is often called a "generic expression" and is created in memory.Purpose: Typically used to replace subqueries that require recursion.Valid range: CTE can
Label:1. Create a new database TestDB 2. Create a new table for the TestDB database userinfo Create a table named UserInfo, including the above fields, where the ID is the primary key and set the identity specification, Nation set the default value "China". Add some data to the table: --using the TestDB database use TestDB go--view data in a userinfo tableSelect* fromUserInfo--add data records for UserInfo insert into UserInfo values ('1001','Zhang
/*--Synchronizing readersINSERT into [172.21.200.8].gdlisxp.dbo. Reader Library (library card number, reader barcode, name, gender, ID number,reader level, level Code, Unit Code, Unit, debit, issuing date, expiration date, ethnicity, reservation information)Select Xs.sfzh,xs.sfzh,xs. XM,(case XS. XBM when ' 1 ' then ' Male ' when ' 2 ' then ' women ' else ' end ' as Xb,xs.sfzh, ' student ', ' B ',DW. Unit code, ' +zy.zymc,20 ', ' 2014-09-16 18:00:00 '
Tags: style blog http color os io ar for dataHow many tables are in SQL Server query database SELECT * from sysobjects WHERE (xtype = ' U ')C = CHECK constraintD = defaults or Default constraintsF = FOREIGN KEY constraintL = LogFN = Scalar functionIF = inline table functionP = stored procedurePK = PRIMARY KEY constraint (type is K)RF = copy Filter stored procedu
Data dictionary is a good thing, for development, maintenance is very important.However, it is not convenient to write descriptive narration in SQL Server, how to simplify and add changes to the extended attributes in batches?It would be nice to add 2 tables and 5 stored procedures,
: increments of several numbers at a time wildcard characters:_: There is only one character% any of any charactersLike ' (used to modify)Having said so much, we should pay attention to some common problems;01. Foreign Key control is not good02. In SQL Server, string and date type data are enclosed in single quotes, and numeric types are not03. Each table must have a primary key, the table without the prima
Label:Data from the database in the work to export, but found that the exported Excel column names are field names (in English), to collect data on how to change the field name to Chinese names, and found that Oracle and SQL Server (SQLSERVER2008R2) is different, as follows: SQL Server database: system table: ---Get in
choice. With seek access, SQL Server uses the index to direct to the data row that satisfies the predicate condition. In this example, we refer to this predicate as "seek predicate". In most cases, SQL Server does not have to re-evaluate "seek predicate" as "residual predicate". The index guarantees that "seek" return
informationCreate Table table (A1 varchar), A2 char (2))--Add descriptive information to the tableEXECUTE sp_addextendedproperty n ' ms_description ', ' personnel information table ', n ' user ', n ' dbo ', n ' table ', N ' table ', NULL, NULL--Add descriptive information for field A1EXECUTE sp_addextendedproperty n ' ms_description ', ' name ', n ' user ', n ' dbo ', n ' table ', n ' table ', n ' column ',
Tags: changing SQL from structure performing LSE highlight insert UPDFirst, two tables were created, Test1 and test2, with the expectation that the relevant records of Test2 could be changed at the same time when the test1 was changed. Assume that Test1 is the same as the table structure of Test2, as shown in the following table
Name
Age
The trigger impl
sent, which can sometimes cause the same record to be fetched simultaneously by multiple processes and sent.Today, we looked at the MSDN of SQL Server and found that it was possible to ensure that each record was read only once by updating it at the same time through the deleted table (as if it were used in a trigger).Declare @Rowid table (Rowid int);BEGINSET ROWCOUNT 100; --Number of rows read at one time
In sqlserver, a simple combination of sp_spaceused and sp_msforeachtable stored procedures can easily calculate the size of the user data table, including the total number of records and space usage, which is very practical, both sqlserver2k and sqlserver2005 passed the test.
/**/
/*1. Exec sp_spaceused 'table name' (SQL statistics, which may be inaccurate after a large number of transaction operations)2
Long unused SQL Server has been using NAVICAT to handle a variety of databases, it feels convenient to use, but because of the actual need to use SQL Server to create a new database, but unexpectedly encountered previously never encountered problems.After the construction of the table, want to modify some properties, t
First, the table structure of a table needs to be copied from one data (a) library to another database (B). The operation step is as follows:① in Database A, select the tables that you want to replicate. Right-Select the Edit table script to creat to the new Query editing window.② in the newly opened Query window, use CTRL + A to copy the script after you select all.③ opens a new query. Paste the copied script into the new query page. and modify the d
Tags: style blog http io ar os using SP strongOriginal: SQL Server 2008|2012 block save changes requiring re-creation of tablesIt is not very understandable why the option to block saving changes that require re-creation of tables is included in SQL Server 2008 and later ver
corresponding tables in the subscription database at intervals, and then plug all of the corresponding tables into the subscription database Using snapshot replication itself is the most appropriate:1) rarely change data.2) allow for a period of time a copy of the data that is obsolete to the publisher server.3) Copy
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