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Complex SQL Split optimizationSplitting SQL is one of the most effective methods of performance optimization, which is to break down complex SQL into simple SQL by a certain logic, and finally execute an equivalent logic with the help of temporary tables, and have achieved efficient execution. I've been trying to write
1. query all tables in SQL:Select TABLE_NAME FROM database name. INFORMATION_SCHEMA.TABLES Where TABLE_TYPE = 'base table' after execution, you can see the names of all tables created by yourself in the database.2. query all tables and columns in SQL:Select dbo. sysobjects. name as Table_name, dbo. syscolumns. name AS Column_name FROM dbo. syscolumns inner join dbo. sysobjects ON dbo. syscolumns. id = dbo. sysobjects. id Where (dbo. sysobjects. xtype = 'U') AND (NOT (dbo. sysobjects. name LIKE '
Topic: Consumers from Madrid with fewer than 3 orders Build table: Copy Code code as follows: SET NOCOUNT ON--When SET NOCOUNT is on, the count is not returned (representing the number of rows affected by Transact-SQL statements). Returns the count when SET NOCOUNT is off Use SY Go If OBJECT_ID (' dbo. Orders ') is not null DROP TABLE dbo. Orders Go If OBJECT_ID (' dbo. Customers ') is not null DROP TABLE dbo. Customers Go CREATE
SQL % found, SQL % notfound, SQL % rowcountWhen executing the DML (insert, update, delete) statement, you can use the following three implicit cursors (the cursor is an area in the memory that maintains the query results, which is opened when DML is run, when it is finished, use SQL % isopen to check whether it is enab
Tags: process variable assignment multiple meanings have a counter target based on nullI. T-SQL overviewThe programming language that SQL Server uses to manipulate the database is Transaction-sql, or T-SQL. T-SQL differs from PL/SQL
Label:The optimization of SQL statements is to convert poorly performing SQL statements into the same performance SQL statements with the same purpose.AI automatic SQL optimization uses AI technology to automatically rewrite SQL statements to find the best-performing equival
the year andGl_detail.periodv'xx' --Remove the beginning of the period andBd_accsubj.subjcode not inch('41040107','41040109','41040207','41040209','41040307','41040308','560106')--minus the month-end ratio and taxes. andBd_glorgbook.glorgbookcode= '015201-0001'--Company Conditions andGl_freevalue.valuecode like '015211%' --Project Responsibility Person condition Group bySUBSTR (Bd_accsubj.dispname,1,4), rollup (Gl_freevalue.valuecode, Gl_freevalue.valuename, Gl_detail.explanation, Bd
SQL Server parallel operation optimization prevents parallel operations from being restrained and affects SQL Execution efficiency and SQL Execution Efficiency Why should I also say SQL Server Parallelism: I have written many articles about SQL Server parallelism in the gard
Abstract: In the PL/SQL development process, SQL, PL/SQL can be used to meet most of the requirements. However, in some special cases, standard SQL statements or DML statements in PL/SQL cannot meet your needs. For example, dynamic table creation or an uncertain operation mu
SQL join is used to query data from these tables based on the relationship between the columns in two or more tables.Join and KeySometimes in order to get the complete result, we need to get the results from two or more tables. We need to execute the join.Tables in the database can be linked by keys. The primary key (Primary key) is a column, and the value of each row in the column is unique. In the table, the value of each primary key is unique. The
11. Microsoft SQL server network settingsOverview of Network ServicesSQL Server application interfaceNetwork Connection LibraryNetwork components and SQL server performanceNetwork MonitoringSummaryAfter you install Microsoft SQL Server, you must set its network settings. Up to now, you or your Microsoft Windows NT or Windows 2000 system administrator may have set
database parameterized ModeThere are two ways to parameterize a database, simple and mandatory (forced), and the default parameterization is "simple" by default.In simple mode, if the SQL is sent every time, unless it is exactly the same, it will be recompiled (special circumstances will be automatically parameterized, it is the focus of this article)The mandatory mode is to force the Adhoc SQL to be parame
After a DML statement is executed, the results of the DML statement are stored in four cursor attributes, which are used to controlProgramProcess or understand the program status. When running a DML statement, PL/SQL opens a built-in cursor and processes the result. The cursor is an area in the memory that maintains the query result. The cursor is opened when running the DML statement and closed after completion. Only
About T-SQL and SQL Enterprise Manager, SQL Enterprise After reading the database video, we often use two methods in the video. One is the SQL Enterprise Manager, and the other is the T-SQL (Tansact-SQL ). For the first method, it
server | sqlserver | data | data type | conversion Why not let SQL Server automatically convert the data type in SQL command for you Report Date: 12/5/2003 Prepared by: Zheng Ye Article last modified on 2004-2-16 The information in this article applies to: ü Microsoft SQL Server 2000, 7.0 Problem statement: One day, execute SELECT * FROM XXX_ORIGINAL_20031205
1. View the version of the databaseSELECT @ @versionSeveral common types of SQL Server patched version numbers:8.00.194 Microsoft SQL Server 20008.00.384 Microsoft SQL Server SP18.00.532 Microsoft SQL Server SP28.00.760 Microsoft SQL Server SP38.00.818 Microsoft
SQL statement optimization improves database performance and SQL statement database performance In systems with unsatisfactory performance, apart from the fact that the application load exceeds the server's actual processing capacity, it is more because the system has a large number of SQL statements that need to be optimized. To achieve stable execution performa
1. view the database versionSelect @ version Common SQL server patch versions: 8.00.194 Microsoft SQL Server 20008.00.384 Microsoft SQL Server 2000 sp18.00.532 Microsoft SQL Server 2000 sp28.00.760 Microsoft SQL Server 2000 sp38.00.818 Microsoft
A big and comprehensive choice between SQL and functions: Who is a more effective SQL ?, More effective SQL Reprinted please indicate the source: jiq •'s technical Blog Note that the Oracle11g database is discussed here. It is not applicable to SQL Server, MYSQL, and other databases. 1. Problem Description There are t
Label:Next: T-SQL Dynamic Query (3)--Static SQLObjective: There's a lot of talk about dynamic queries, and this article describes some of the ways to use dynamic SQL to solve dynamic queries.Why use Dynamic sql: in many projects, dynamic SQL is widely used and even misused, and in many cases, dynamic
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