SQL commands for regularly deleting historical data from databases and SQL commands for historical data
Create a job,Used to regularly clear historical database data
Delete the data of the first quarter of the table before gps_comm, as follows:
Elete from gps_comm
WHERE (date
If you want to continue to delete the dat
XXXX_ORIGINAL_20031205
where msgid = 120
Command will get the error:
Conversion of varchar value '12050003010101026986' overflowed int column. Exceeded maximum integer value.
Does this error clearly indicate what SQL Server is doing when it executes SQL commands for you?
He tries to help you actively convert this field in the record to the data type you speci
ArticleDirectory
1. directly execute SQL query
2. directly execute SQL commands
Here we will introduce that the query by using LINQ to SQL is insufficient to meet the needs of specialized tasks. We can use the executequery method to execute the query by using LINQ to
conversion from: http://www.51testing.com /? Uid-239867-action-viewspace-itemid-103705
SQLDifferences between statements, PL/SQL blocks, and SQL * Plus commands
The SQL statement isDatabaseThe language of the operation object, including the data definition language DDL, data manipulation language DML,
/gravity /center ">Found two commands together, namely student and where are connected together. So when you use the a command to add a command to the buffer to hit two return, the first carriage return is a command must take the carriage return, the second carriage return is added as the beginning of the new code to the buffer, for example:Q: Suppose the buffer has 3 rows of SQL
Oracle learning notes 3 SQL commands, oracle learning notes SQLSQL introduction SQL supports the following types of commands: 1. data Definition Language (DDL) 2. data manipulation language (DML) 3. transaction Control Language (TCL) 4. the Data Control Language (DCL) is a detailed note of the four
Oracle learning notes 4 SQL commands (2): SQL operation language category, oracle learning notes
SQL is classified into the following language categories1. Data Definition Language (DDL)Create, Alter, Drop
2. Data manipulation language (DML)Insert, Select, Delete, Update
3. Transaction Control Language (TCL)Commit, Sav
Using system. data. the sqlclient namespace can only execute one SQL statement or multiple Content in the middle; separate, cannot execute similar commands, is there a way to execute some batch commands like a query analyzer, the answer is to execute it through osql.
Detailed usage of osql: http://technet.microsoft.com/zh-cn/library/ms162806.aspx
Call through the
XML Auto Features and T-SQL commands
As a DBA, I tend to focus on performance issues, so I want to make sure that using XML (an Extensible Markup language) does not have an impact on performance. In this article, I'll show the difference in performance by comparing the XML Auto feature with the standard T-SQL command. During my testing, I'll just cover a small,
It is estimated that SQL * Plus is used almost at the beginning in Oracle,
After all, this tool can run on any platform running Oracle,
You can install this tool on the client or on the server,
To install the client, install the client software provided by Oracle,
On the server side, it is automatically installed when Oracle is installed,
SQL * Plus is a C/S-based SQL
saved. We can modify the SQL statement stored in SQL buffer and execute it again. SQL * plus generally deals with databases.Apart from SQL * plus statements, other statements executed in SQL * plus are called SQL * plus
\TaxInvoice.sql ' Of course, we can simply execute these commands in a batch file Updateschema.cmd without using the stored procedure, which is the following UPDA Teschema.cmd:; The following command executes the specified SQL script under D:\vss: Isql-u sa-p 123-i d:\vss\MSSchema.txt
Isql-u sa-p 123-i D:\vss\MSSchema_030311.txt
Isql-u sa-p 123-i D:\vss\MSSchema_030416.txt
Isql-u sa-p 123-i D:\vss\MSSchema_
Execute SQL Server database backup and SQL database backup using Windows batch processing commands
Create mybackup. bat and enter the following content to directly run the script to start automatic database backup. You can also add the script to the windows Task Plan for execution.
@ Echo offset path = % path %; C: Program Files \ Microsoft
deals with databases.
What is ddl dml dcl.
DDL database definition language, including create drop alter
DML database management language, including select update delete
DCL Database Control Language, including grant and revoke
The following describes some common SQL * Plus commands:
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1. how to connect to a database is verified by the operating system:
of the currency1.txt
AED Emirati dirham 1998-06-01 00:00:00.000
AFA Afghani 1998-06-01 00:00:00.000
... ... ...
... ... ...
ZWD Zimbabwe Dollar 1998-06-01 00:00:00.000
When you log in using a password, you need to enclose the-u username and the post-p password with double quotes.
Note: In addition to being able to execute in the console, BCP can also run bcp in SQL statements by calling a system stored procedure of
" with "new text" in the current line ".Note that there is no space between C/oldtext/newtext,/oldtext and/newtext. If C/DEPT/EMP is used in the following example, the "SP2-0023: no string found" error occurs.
SQL> select ename, deptno, Sal2 from Dept3 where SAL> 10004 order by Sal DESC;Where SAL> 1000*Row 3 has an error:The ORA-00904: "Sal": Invalid identifier
SQL> L1 select ename, deptno, Sal2 from Dept3
Import directly in MySQLQureyBrower *. SQL scripts cannot execute multiple SQL commands at a time. Execute the SQL FILE command mysqlsourcec: \ test in mysql. SQL; Appendix mysql Common commands: (1) connect to MYSQL: Format: mysq
Oracle SQL * Plus is a client tool that interacts with Oracle. In SQL * Plus, you can run the SQL * Plus command and the SQL * Plus statement. The DML, DDL, and DCL statements we usually call are SQL * Plus statements. After they are executed, they can be stored in a memory
4.7.1 BACKUP
The backup command is used to back up database content or its transaction log to storage media (floppy disk, hard disk, tape). The dump command is used to perform this function when the previous version of SQL Server 7.0 is in use, and the dump command is no longer used from SQL Server 2000. For more information on the backup command, see the "Data Backup and Recovery" section.
4.7.2 CHECKPOI
The first thing to note is that the content of this article is not how to adjust SQL Server query performance (to write a book about this), but how to use set STATISTICS IO and set STATISTICS in the tuning of SQL Server query performance Time these two Transact-SQL commands that are often ignored.
On the surface, the
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